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zotero://report/items/0_RWVKADQ2-0_5NTS6XRI-0_78NAVCXE-0...

A simple model for vertical annular and horizontal stratified two-phase flows with liquid entrainment and phase transitions: one-dimensional steady state conditions Type Auteur Auteur URL Volume Pages Publication Date Extra Résumé

Article de revue Vladimir Stevanovic Milovan Studovic http://\\anpi0733\ynen$\YNen978.pdf 154 357-379 Nuclear Engineering and Design avril 1, 1995 3 A simple one-dimensional three-fluid model is presented for the simulation and analyses of vertical annular and stratified horizontal or inclined two-phase flows. The model has been verified for various experimental data: developing annular flow, momentum transfer in an annular flow, plane flow with a hydraulic jump, flooding in a horizontal pipe, and stratified flow with direct steam condensation. Emphasis has been laid upon several mass, momentum and energy interfacial transfer processes. New correlations are proposed for the droplet entrainment intensity in annular flow and for steam direct contact condensation on the liquid film in a stratified flow. The liquid entrainment in the annular flow is correlated with the liquid film thickness. Direct contact condensation is correlated with the turbulent convective heat transfer in the liquid film. It has been shown that the present model is able to predict all dominant processes in both types of flow. Titre abrégé A simple model for vertical annular and horizontal stratified two-phase flows with liquid entrainment and phase transitions: one-dimensional steady state conditions Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Notes : ID - 2042 LB - YNen978

Analysis of effects of air pocket on hydraulic failure of urban drainage infrastructure Type Auteur Auteur Auteur URL

Article de revue F. Zhou F. Hicks P. Steffler ://000189258900009

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Volume Pages Publication ISSN Date Loc. dans l'archive Extra DOI Langue Résumé

31 86-94 Canadian Journal of Civil Engineering 0315-1468 2004 Jan WOS:000189258900009 1 10.1139/l03-077 English The effects of trapped air on flow oscillations and pressure surges in a model trunk sewer-manhole system subject to rapid filling are investigated. The study reveals the detrimental impacts of entrapped air during severe storm events under which pipelines are likely overloaded. The results of the investigation indicated huge peak pressures and severe pressure oscillations inside the system. Titre abrégé Analysis of effects of air pocket on hydraulic failure of urban drainage infrastructure Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : flow, flow transient, rapid filling, Sewers, trapped air

Notes : 778UJ Times Cited:0 Cited References Count:12 AD - Zhou, F City Edmonton, Drainage Serv, 14323 115 Ave, Edmonton, AB T5M 3B8, Canada Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2G7, Canada ID - 2195 LB - YNen1383

Analysis of transient flow in pipelines with fluid-structure interaction using method of lines Type Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive

Article de revue Y. L. Zhang K. Vairavamoorthy ://000230324800005 63 1446-1460 International Journal for Numerical Methods in Engineering 2005 Jul WOS:000230324800005

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Extra 10 DOI 10.1002/nme.1306 Titre abrégé Analysis of transient flow in pipelines with fluid-structure interaction using method of lines Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27


Cavity outflow from a nearly horizontal pipe Type Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra DOI Résumé

Article de revue W. H. Hager http://\\anpi0733\ynen$\YNen1115.pdf 25 349-364 International Journal of Multiphase Flow 1999 YNen1115 WOS:000079455600007 2 10.1016/S0301-9322(98)00046-9 Outflow from a circular pipe is considered for cavity flow. The cavity geometry, the end depth and the jet trajectories are described, in terms of the pipe Froude number. This is an extension of previous work for pipes sufficiently large such that effects of viscosity and surface tension can be neglected. Titre abrégé Cavity outflow from a nearly horizontal pipe Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 13:16:06


Pièces jointes YNen1115.pdf

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Critical liquid flows for the transition from the pseudo-slug and stratified patterns to slug flow Type Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue A. Soleimani T. J. Hanratty http://\\anpi0733\ynen$\YNen914.pdf 29 51-67 International Journal of Multiphase Flow 2003 JAN WOS:000180717100003 1 Int J Multiphas Flow 10.1016/S0301-9322(02)00124-6 It has recently been shown that a consideration of the stability of a stratified flow and of the stability of a slug has provided accurate predictions of the critical liquid height of a stratified flow for the transition to a slug or plug flow in horizontal and downwardly inclined pipes. Two diameters and viscosities of 1-70 cp were considered. Predictions of the critical superficial liquid velocity are not so accurate. This paper partially examines this issue by presenting measurements of the mean pressure gradient and of the time-varying holdup for air and water flowing in a horizontal 2.54 cm pipe. Important contributions are the use of viscous long wavelength theory to predict the initiations of roll waves and the discovery of a range of liquid flows (in the pseudo-slug regime) at which the liquid holdup of the stratified layer is close to the critical and is not changing strongly with liquid flow. A partial explanation for this behavior is given which recognizes that the liquid layer over which roll waves are propagating is below that required for the stability of a slug. Slugs will appear if conditions are favorable for the coalescence of roll waves. (C) 2002 Elsevier Science Ltd. All rights reserved. Titre abrégé Critical liquid flows for the transition from the pseudo-slug and stratified patterns to slug flow Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : flow regime transition, gas-liquid flow, initiation, pseudo-slugs, roll waves, slug flow, stability

Notes : AD - Hanratty, T. J. Univ Illinois, Dept Chem Engn, Roger Adams Lab 205, Box C-3 600 S Mathews Ave, Urbana, IL 61801 USA Univ Illinois, Dept Chem Engn, Roger Adams Lab 205, Urbana, IL 61801 USA ID - 2027 LB - YNen914

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Drops in annular two-phase flow Type Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Abrév. de revue Résumé

Article de revue B. J. Azzopardi http://\\anpi0733\ynen$\YNen905.pdf 23 1-53 International Journal of Multiphase Flow 1997 DEC YNen905 WOS:000075321700001 Int J Multiphas Flow Drops, one of the forms in which liquid is present in annular gas-liquid flow, are formed from the wall film, carried by the gas or vapour and redeposited. During this time they exert a strong influence on many important parameters of both flow and heat transfer. The available information on the creation, size and velocity, and removal of drops is identified and reviewed. This review shows that there is an extensive literature on drops and the associated topic of waves in annular gas-liquid flows. In spite of the large number of papers that have been published, there are still some fundamental questions which remain unanswered and there are large gaps in the parameter ranges to be considered. (C) 1998 Elsevier Science Ltd. All rights reserved. Titre abrégé Drops in annular two-phase flow Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 10:55:33

Marqueurs : dense sprays, interfacial drag, ldv measurements, liquid flows, multiple-scattering, particle-size, roll waves, solid 2-phase flow, turbulent gas-stream, vertical pipe

Notes : LB - YNen905 AD - Azzopardi, B. J. Univ Nottingham, Sch Chem Environm & Min Engn, Univ Pk, Nottingham NG7 2RD, England Univ Nottingham, Sch Chem Environm & Min Engn, Nottingham NG7 2RD, England ID - 1268


Experiments on Unsteady Turbulent Pipe Flow

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Type Auteur Auteur Volume Pages Publication Date Extra Résumé

Article de revue John P. Viola Hans J. Leutheusser 130 240-244 Journal of Engineering Mechanics février 2004 2 The paper explores the time-wise evolution of selected turbulence parameters during gravity-driven flow establishment of incompressible fluids in rigid circular pipes. Two initial conditions are considered: flow starting from rest, passing through laminarto-turbulent transition, and terminating in a turbulent steady state; and transient flow between two turbulent steady states. It is found that, in the second case, the properties considered, i.e., local temporal mean velocity and its transverse distribution, axial turbulence intensity, and wall shear stress, are monotonically increasing with time. However, for flow starting from rest, all properties are strongly affected by the development of turbulence. In particular, at the critical moment when laminar-to-turbulent transition is complete, the wall shear stress changes abruptly from one to the other, identifying wall shear stress as a very sensitive indicator of criticality. Titre abrégé Experiments on Unsteady Turbulent Pipe Flow Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : laminar to turbulent transitions, Pipe flow, Shear flow, turbulence


Flow regimes in two-phase gas-liquid flow Type Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra

Article de revue P. L. Spedding D. R. Spence http://www.sciencedirect.com/science/article/B6V45-47YSDM5-1P /2/8cdd0551c4202b7523cac2f3190462d3 19 245-280 International Journal of Multiphase Flow 1993 WOS:A1993KW57800002 2

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DOI 10.1016/0301-9322(93)90002-C Résumé Experimental data were determined for co-current air-water horizontal flow in a 0.0935 m i.d. pipe. The flow patterns were identified by a combination of visual/video observations, the pressure fluctuation characteristics and a detailed examination of the pressure loss and holdup data. The results together with previous work at 0.0454 m i.d. were used to test existing flow regime maps. Several of the maps did not predict correctly the flow regimes for the two diameters. Theoretical and empirical models developed for the prediction of flow pattern transitions were also proved to be deficient in handling changes in physical properties and geometry. Thus, a need was shown to exist to develop a more satisfactory method of phase transition prediction. Titre abrégé Flow regimes in two-phase gas-liquid flow Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Notes : TY - JOUR ID - 2037 LB - YNen959

Fluctuation of air-water two-phase flow in horizontal and inclined water pipelines Type Auteur Auteur Auteur URL Volume Pages Publication ISSN Date Loc. dans l'archive Extra DOI Résumé

Article de revue A. R. Kabiri-Samani S. M. Borghei M. H. Saidi http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal& id=JFEGA4000129000001000001000001&idtype=cvips&gifs=Yes 129 1-14 Journal of Fluids Engineering-Transactions of the Asme 0098-2202 2007 Jan WOS:000243712700001 1 10.1115/1.2375134 Air in water flow is a frequent phenomenon in hydraulic structures. The main reason for air entrainment is vortices at water intakes, pumping stations, tunnel inlets, and so on. The accumulated air in a conduit, can evolve to a different flow pattern, from stratified to pressurized. Among different patterns, slug is most complex with extreme pressure variations. Due to lack of firm relations between pressure and influential parameters, study of slug flow is very important. Based on an experimental model, pressure fluctuations inside a circular horizontal, and

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inclined pipe (90 mm inside diameter and 10 m long) carrying tow-phase air-water slug flow has been studied. Pressure fluctuations were sampled simultaneously at different sections, and longitudinal positions. The pressure fluctuations were measured using differential pressure transducers (DPT), while behavior of the air slug was studied using a digital camera. The objective of the paper is to predict the pressure variation in a pipeline or tunnel, involving resonance and shock waves experimentally. The results show that the more intensive phase interaction commences stronger fluctuations. It is shown, that the air-water mixture entering the pipe during rapid filling of surcharging can cause a tremendous pressure surge in the system and may eventually cause failure of the system (e.g., the maximum pressure inside the pipe would reach up to 10 times of upstream hydrostatic pressure as suggested by others too). Relations for forecasting pressure in these situations are presented as a function of flow characteristics, pipe geometry, longitudinal, and cross-sectional positions and head water. Titre abrégé Fluctuation of air-water two-phase flow in horizontal and inclined water pipelines Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27


Gas-liquid flow in slightly inclined pipes Type Auteur Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue E. Grolman J. M. H. Fortuin http://\\anpi0733\ynen$\YNen909.pdf 52 4461-4471 Chemical Engineering Science 1997 DEC YNen909 WOS:000071366000004 24 Chem Eng Sci 10.1016/S0009-2509(97)00291-1 The modified apparent rough surface (MARS) model is presented, which facilitates prediction of liquid holdup and pressure gradient in gas-liquid flow through horizontal and slightly sloping pipes. The model is based on two steadystate, one-dimensional momentum balance equations, which include the superficial velocities and transport properties of gas and liquid, the diameter of the pipe and its angle from the horizontal. Separate correlations are proposed for the interfacial friction factor f(i), the liquid-re-wall friction factor f(L), the

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interfacial perimeter S-i and the wetted perimeter S-L. Predicted values of liquid holdup and pressure gradient are verified against results of 2400 carefully performed, laboratory experiments in horizontal and sloping glass pipes (-3 degrees less than or equal to beta less than or equal to +6 degrees) of 15, 26 and 51 mm diameter. The liquid holdup epsilon(L) ranges from 0 to 0.42, and the superficial liquid velocity u(LS) from 0 to 0.06 ms(-1) and the superficial gas velocity u(GS) from 1.8 to 34 ms(-1). The gas-liquid systems used are air/water and air/tetradecane (n-C14H30) at atmospheric pressure and room temperature. Significant effects of small inclination angles were found at low gas flow rates, leading to an Eightfold increase in liquid holdup and more than a fourfold increase in pressure gradient compared to horizontal flow. Nevertheless, the average relative error in the prediction of liquid holdup and pressure gradient is less than 10%. (C) 1997 Elsevier Science Ltd. Titre abrégé Gas-liquid flow in slightly inclined pipes Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 13:14:24

Marqueurs : gas-liquid pipe flow, holdup, inclined, model, pressure gradient, pressure-drop, roll waves, slug flow

Notes : AD - Fortuin, J. M. H. Univ Amsterdam, Dept Chem Engn, Nieuwe Achtergracht 166, NL-1018 WV Amsterdam, Netherlands Univ Amsterdam, Dept Chem Engn, NL-1018 WV Amsterdam, Netherlands ID - 1556 LB - YNen909


Gas-liquid stratified-wavy flow in horizontal pipelines Type Auteur Auteur Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra

Article de revue X. T. Chen X. D. Cai J. P. Brill ://000071322400001 119 209-216 Journal of Energy Resources Technology-Transactions of the Asme 1997 Dec YNen920 WOS:000071322400001 4 18/02/2014 18:29

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Abrév. de revue DOI Titre abrégé Date d'ajout Modifié le

J. Energy Resour. Technol.-Trans. ASME 10.1115/1.2794992 Gas-liquid stratified-wavy flow in horizontal pipelines mercredi 17 octobre 2012 12:39:27 mardi 18 février 2014 13:07:39

Marqueurs : holdup, pipe-flow, pressure-drop

Notes : YP853 J ENERG RESOUR TECHNOL ID - 1405 LB - YNen920

Gas-liquid two phase flow through a vertical 90[deg] elbow bend Type Auteur Auteur URL Volume Publication Résumé

Article de revue P. L. Spedding E. Benard http://\\anpi0733\ynen$\YNen1368.pdf In Press, Corrected Proof Experimental Thermal and Fluid Science Pressure drop data are reported for two phase air-water flow through a vertical to horizontal 90[deg] elbow bend set in 0.026 m i.d. pipe. The pressure drop in the vertical inlet tangent showed some significant differences to that found for straight vertical pipe. This was caused by the elbow bend partially choking the inflow resulting in a build-up of pressure and liquid in the vertical inlet riser and differences in the structure of the flow regimes when compared to the straight vertical pipe. The horizontal outlet tangent by contrast gave data in general agreement with literature even to exhibiting a drag reduction region at low liquid rates and gas velocities between 1 and 2 m s-1.The elbow bend pressure drop was best correlated in terms of le/d determined using the actual pressure loss in the inlet vertical riser. The data showed a general increase with fluid rates that tapered off at high fluid rates and exhibited a negative pressure region at low rates. The latter was attributed to the flow being smoothly accommodated by the bend when it passed from slug flow in the riser to smooth stratified flow in the outlet tangent.A general correlation was presented for the elbow bend pressure drop in terms of total Reynolds numbers. A modified Lockhart-Martinelli model gave prediction of the data. Titre abrégé Gas-liquid two phase flow through a vertical 90[deg] elbow bend Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs :

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Air-water flow, Bend pressure loss, Prediction of pressure loss, Two phase flow in bend


Investigation of transition from free surface to pressurized flow in a circular pipe Type Auteur Auteur Auteur Auteur Volume Pages Publication Date Cote Loc. dans l'archive Extra DOI Titre abrégé Date d'ajout Modifié le

Article de revue B. Trajkovic M. Ivetic F. Calomino A. D'Ippolito 39 105-112 Water Science and Technology 1999 YNen755 WOS:000081253500014 9 10.1016/S0273-1223(99)00222-X Investigation of transition from free surface to pressurized flow in a circular pipe mercredi 17 octobre 2012 12:39:27 mardi 18 février 2014 10:45:09

Notes : ID - 2086

Liquid Hold-up, Pressure Gradient, and Flow Patterns in Inclined Gas-Liquid Pipe Flow Type Auteur Auteur URL Volume Pages Publication Date Cote

Article de revue Eric Grolman Jan M. H. Fortuin http://\\anpi0733\ynen$\YNen910.pdf 15 174-182 Experimental Thermal and Fluid Science 1997 YNen910 18/02/2014 18:29

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Extra 3 Titre abrégé Liquid Hold-up, Pressure Gradient, and Flow Patterns in Inclined Gas-Liquid Pipe Flow Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 13:15:17



Mechanism of slug formation in downwardly inclined pipes Type Auteur Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue B. D. Woods E. T. Hurlburt T. J. Hanratty http://\\anpi0733\ynen$\YNen916.pdf 26 977-998 International Journal of Multiphase Flow 2000 JUN WOS:000087294800004 6 Int J Multiphas Flow 10.1016/S0301-9322(99)00075-0 This paper examines the effect of small downward inclinations on the formation of slugs. Experiments were conducted with air and water at atmospheric pressure, in a pipe with a diameter of 0.0763 m, a length of 23 m and inclinations of -0.2, -0.5 and -0.8 degrees. Measurements of the variation of the interfacial displacement were made simultaneously at a number of locations. For low gas velocities in a horizontal configuration waves with lengths of 16-20 cm, grow until they reach of the top of the pipe. These waves evolve from smaller wavelength waves (8-10 cm) through a non-linear growth mechanism. At high gas velocities, the liquid height is not large enough for this mechanism to be operable. In these cases slugs evolve from the coalescence of roll waves. Surprisingly, the large amplitude small wavelength waves observed in horizontal flows, at the transition to slug flow, are damped in pipelines that are inclined slightly downward. The transition is associated with the initiation of long wavelength, small amplitude waves, whose appearance is predicted by a viscous long wavelength linear stability analysis. A local Kelvin-Helmholtz instability at the crest of a growing long wavelength wave is observed when a slug forms. The

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frequency of slugging is equal to frequency of these long wavelength waves. (C) 2000 Elsevier Science Ltd. All rights reserved. Titre abrégé Mechanism of slug formation in downwardly inclined pipes Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : 2-phase flow, gas-liquid flow, gas-liquid pipe flow, initiation, pipe inclination, slug flow, slug frequency, stability, stratified-slug flow transition, transition

Notes : AD - Hanratty, T. J. Univ Illinois, Dept Chem Engn, Urbana, IL 61801 USA Univ Illinois, Dept Chem Engn, Urbana, IL 61801 USA ID - 2160 LB - YNen916

Modeling two-phase flow in pipe bends Type Auteur Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra DOI Résumé

Article de revue S. Supa-Amornkul F. R. Steward D. H. Lister http://www.sciencedirect.com/science/article/B6WW2-4GVB2GY4B2/2/dd457ab377c96c6192b153e84b23f28d 127 204-209 Journal of Pressure Vessel Technology, Transactions of the ASME 2005 WOS:000229887400016 2 10.1115/1.1904063 In order to have a better understanding of the interaction between the two-phase steam-water coolant in the outlet feeder pipes of the primary heat transport system of some CANDU 17 reactors and the piping material, themalhydraulic modelling is being performed with a commercial computational fluid dynamics (CFD) code - FLUENT 6.1. The modeling has attempted to describe the results of flow visualization experiments performed in a transparent feeder pipe with air-water mixtures at temperatures below 55 [deg]C. The CFD code solves two sets of transport equations - one for each phase. Both phases are first treated separately as homogeneous. Coupling is achieved through pressure and interphase exchange coefficients. A symmetric drag model is employed to describe the interaction between the phases. The geometry and flow regime of interest are a 73 deg bend in a 5.9 cm diameter pipe containing water with a

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Reynolds number of ~1E5-1E6. The modeling predicted single-phase pressure drop and flow accurately. For two-phase flow with an air voidage of 5-50%, the pressure drop measurements were less well predicted. Furthermore, the observation that an air-water mixture tended to flow toward the outside of the bend while a single-phase liquid layer developed at the inside of the bend was not predicted. The CFD modeling requires further development for this type of geometry with two-phase flow of high voidage. Copyright (c) 2005 by ASME. [Journal Article; 16 Refs; In English; Summary in English] Titre abrégé Modeling two-phase flow in pipe bends Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Notes : TY - JOUR ID - 2059 LB - YNen1263

Modelling of stratified gas-liquid two-phase flow in horizontal circular pipes Type Auteur Auteur Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra DOI Résumé

Article de revue Paulo A. B. de Sampaio José L. H. Faccini Jian Su http://\\anpi0733\ynen$\YNen1495.pdf 51 2752-2761 International Journal of Heat and Mass Transfer 2008 YNen1495 WOS:000256128800011 11-12 10.1016/j.ijheatmasstransfer.2007.09.038 This paper reports numerical and experimental investigation of stratified gas-liquid two-phase flow in horizontal circular pipes. The Reynolds averaged Navier-Stokes equations (RANS) with the k-[omega] turbulence model for a fully developed stratified gas-liquid two-phase flow are solved by using the finite element method. A smooth interface surface is assumed without considering the effects of the interfacial waves. The continuity of the shear stress across the interface is enforced with the continuity of the velocity being automatically satisfied by the variational formulation. For each given interface position and longitudinal pressure gradient, an inner iteration loop runs to solve the non-linear equations. The Newton-Raphson scheme is used to solve the transcendental equations by an outer iteration to determine the interface position and pressure gradient for a given pair of volumetric flow rates. Favorable comparison of the

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numerical results with available experimental results indicates that the k-[omega] model can be applied for the numerical simulation of stratified gas-liquid two-phase flow. Titre abrégé Modelling of stratified gas-liquid two-phase flow in horizontal circular pipes Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 13:11:52

Marqueurs : Computational simulation, Finite element method, Gas-liquid two-phase flow, k-[omega] model, Smooth stratified flow



Numerical modeling of wavy stratified two-phase flow in pipes Type Auteur Auteur Auteur Auteur URL Volume Pages Publication Date Cote Extra Résumé

Article de revue Fouad Meknassi Rachid Benkirane Alain Line Lucien Masbernat http://\\anpi0733\ynen$\YNen891.pdf 55 4681-4697 Chemical Engineering Science octobre 15, 2000 YNen891 20 The paper presents the numerical modeling of stratified flow in circular cross-section pipe. Due to the geometry of this two-phase flow, the equations of the problem are derived in bipolar coordinate system. Above the waves, the gas flow structure is three dimensional, since secondary flows are induced by the non-uniformity of boundary conditions related to smooth wall and wavy or rough interface. The secondary flows being generated by the anisotropy of the turbulence, an algebraic stress model is used in the gas flow model. The roughness of the interface is determined from experiments. Given vertical profiles of longitudinal velocity in the gas and assuming a classical logarithmic law above the waves, it is possible to determine the magnitude of the interfacial roughness. These experimental values are imposed in the numerical simulations. Given these values, the comparison between experimental profiles and

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computed ones is shown to be satisfactory. Hence, the simulations validate the concept of interfacial roughness to account for gas-liquid interactions. Finally, the interfacial roughness are non-dimensionalized following Charnock proposal and its order of magnitude to be imposed in the numerical simulations is given. Titre abrégé Numerical modeling of wavy stratified two-phase flow in pipes Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 10:41:10

Notes : ID - 1795


Numerical simulation of the flow in a conduit, in the presence of a confined air cushion Type Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue T. D. Nguyen ://000078610200008 29 485-498 International Journal for Numerical Methods in Fluids 1999 Feb 28 WOS:000078610200008 4 Int. J. Numer. Methods Fluids 10.1002/(SICI)1097-0363(19990228)29:43.0.CO;2-# A rectangular conduit with a closed end has water flowing in/out at the other end. The water level at the open end has an imposed sinusoidal movement. When this level is higher than the ceiling of the conduit, a certain mass of air is trapped under the ceiling. In a previous article (T.D. Nguyen, La Houille Blanche, No. 2, 1990), it was supposed that this air is flowing out freely through the ceiling, so the relative pressure at the water surface is zero, and the water hammer at the dead end of the conduit was calculated when the conduit was thoroughly filled. In this article, it is supposed that the trapped air is compressed isothermally or adiabatically. The set of equations is resolved (water continuity and movement equations, air state equation) by supposing a regime of flow at each section (section submerged or not), a certain value for the air pressure and by using the sweep method to determine the water flow characteristics. The air volume calculated by iteration must converge, and the calculated regimes at each section (submerged or free) must agree with the supposed regimes. The simulation is performed first with a horizontal conduit then with an inclined conduit. As expected, adiabatic compression gives higher pressure than isothermal compression. The simulation shows also that when there is an air cushion, compared with the case when air is flowing out freely, the shock of the

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water hammer at the closed end of the conduit is significantly reduced. This method is aimed at calculating the now with entrapped air in the inlet/outlet tunnel of a hydroelectric plant, or in sewer system pipe when a sudden discharge surge (due to turbin opening/closing or to urban storm) changes a previously free-surface flow in a mostly full- pipe flow, but with some air entrapped under the ceiling. Copyright (C) 1999 John Wiley & Sons, Ltd. Titre abrégé Numerical simulation of the flow in a conduit, in the presence of a confined air cushion Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : entrapped air, free-surface/pressurized flow, water hammer

Notes : 167AJ INT J NUMER METHOD FLUID ID - 1868 LB - YNen758

Observations of air-water interaction in a rapidly filling horizontal pipe Type Auteur Auteur Auteur Volume Pages Publication Date Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue F. Zhou F. E. Hicks P. M. Steffler 128 635-639 J. Hydraul. Eng. 2002 Jun WOS:000175722500010 6 J. Hydraul. Eng.-ASCE 10.1061/(ASCE)0733-9429(2002)128:6(635) This paper presents the results of an observational study related to the behavior of drainage sewers under conditions of hydraulic overloading. Specifically, the investigation focuses on the interaction of water and trapped air in surcharging drainage and pressurized pipeline systems, by studying the air- water flow behavior in a rapidly filling horizontal pipe. Air- water interface patterns, air entrainment, and air release through an orifice at the pipe end are documented photographically. Synchronously recorded pressure traces are also presented to illustrate the relation between the air-water phase evolution and the pressure oscillation patterns. Depending on the air release rate of the orifice, there are three types of pressure oscillation behavior, each corresponding to a particular

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behavior of the air-water interface in the rapidly filling horizontal pipe. Titre abrégé Observations of air-water interaction in a rapidly filling horizontal pipe Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : air, Air-water interaction, entrainment, overload flow, sewer pipes

Notes : 554FC J HYDRAUL ENG-ASCE ID - 2197 LB - YNen250

Robust numerical treatment of flow transitions at drainage pipe boundaries Type Auteur Auteur Auteur Auteur Volume Pages Publication Date Cote Loc. dans l'archive Extra Abrév. de revue DOI Résumé

Article de revue H. Capart C. Bogaerts J. Kevers-Leclercq Y. Zech 39 113-120 Water Science and Technology 1999 YNen763 WOS:000081253500015 9 Water Sci. Technol. 10.1016/S0273-1223(99)00307-8 The present report describes a comprehensive modelling framework developed to handle flow transitions within drainage pipes and at their boundaries. The proposed numerical scheme is based on a finite volume formulation. Detailed specifications of boundary conditions at pipe ends are provided, along with a decision tree allowing to seamlessly manage transitions such as flow reversal, entrance drowning, or hydraulic jump migration through the boundaries. Proofof-concept examples and comparison with laboratory data are given to illustrate the robustness of the proposed approach. (C) 1999 Published by Elsevier Science Ltd on behalf of the IAWQ. All rights reserved. Titre abrégé Robust numerical treatment of flow transitions at drainage pipe boundaries Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 10:59:40

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Marqueurs : boundary conditions, finite volume numerical scheme, flow, hydraulic transients, reversal, urban drainage, water

Notes : KH ID - 1369 LB - YNen763

Transient flow in a rapidly filling horizontal pipe containing trapped air Type Auteur Auteur Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra DOI Résumé

Article de revue F. Zhou F. E. Hicks M. Asce P. M. Steffler ://000175722500009 128 625-634 J. Hydraul. Eng. 2002 Jun WOS:000175722500009 6 10.1061/(ASCE)0733-9429(2002)128:6(625) The pressure within a trapped air pocket in a rapidly filling horizontal pipe is investigated both experimentally and analytically. The downstream end of the pipe is either sealed to form a dead end or outfitted with an orifice to study the effects of air leakage on the pressure. Three types of pressure oscillation patterns are observed, depending on the size of the orifice. When no air is released or orifice sizes are small, the cushioning effects of the air pocket prevents the water column from impacting on the pipe end and from generating high water hammer pressures. However, the maximum pressure experienced may still be several times the upstream driving pressure. When the orifice size is very large, the air cushioning effect vanishes and the water hammer pressure is dominant. For intermediate orifice sizes, the pressure oscillation pattern consists of both long-period oscillations (while the air pocket persists) followed by short-period pressure oscillations (once water hammer pressures dominate), Air leakage is observed to play a significant role in increasing the magnitude of the observed pressures during rapid filling, resulting in peak pressures up to 15 times the upstream head. An analytical model, capable of calculating the air pocket pressure and the peak pressure when the water column slams into the end of the pipe. is developed and results are compared with those of experiments. The model was successful in determining the amplitude of the peak pressure for the

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entire orifice range and was able to simulate the pressure oscillation pattern for the case of a negligible water hammer impact effect. Although the model was unable to simulate the pressure oscillation pattern for substantial air release, it was able to predict the type of pressure oscillation behavior and the peak pressure. Titre abrégé Transient flow in a rapidly filling horizontal pipe containing trapped air Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Marqueurs : air water interaction, oscillations, pipes, transient flow

Notes : Article ID - 2196 LB - YNen1013

Transient gas-liquid flow in upward sloping pipes, approaching the wavy-to-slug flow transition Type Auteur Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra Abrév. de revue DOI Titre abrégé

Article de revue E. Grolman J. M. H. Fortuin ://A1996WD48700017 118 729-735 Journal of Fluids Engineering-Transactions of the Asme 1996 Dec YNen921 WOS:A1996WD48700017 4 J. Fluids Eng.-Trans. ASME 10.1115/1.2835502 Transient gas-liquid flow in upward sloping pipes, approaching the wavy-to-slug flow transition Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mardi 18 février 2014 13:14:03

Marqueurs : holdup, model, pressure-drop

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Notes : WD487 J FLUID ENG ID - 1555 LB - YNen921

Transient Mixed-Flow Models for Storm Sewers Type Auteur Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra DOI Résumé

Article de revue C. C. S. Song J. A. Cardle K. S. Leung http://\\anpi0733\ynen$\YNen1326.pdf 109 1487-1504 J. Hydraul. Eng. 1983 WOS:A1983RN50200006 11 10.1061/(ASCE)0733-9429(1983)109:11(1487) A new dynamic mathematical model capable of simulating unsteady free surface-pressurized flows is presented. The model allows two options. The first option simplifies the mixed-flow problem to a free-surface flow problem by adding a hypothetical slot at the crown of the pipe. The second option treats the two flow regimes separately but joined together by an interface which is regarded as a shock wave. The speed, location, and intensity of the shock wave are computed at every time step. Interactions between the shock wave and various structures such as junctions, inflow drop structures, overflow relief structures, surge relief structures, and upstream and downstream ends are simplified using appropriate boundary conditions. The method of characteristics is used. The model is applied to a new combined sewer network and some numerical results are presented. It is shown that the pressurization phenomenon is a very dynamic phenomenon even without rapid change of any boundary condition. The pressurization wave tends to become very steep shortly after its formation and generates waterhammer as well as surges upon collision with hydraulic structures. This example serves as a warning that less than a fully dynamic model should not be used for a system which undergoes a pressurization process. Titre abrégé Transient Mixed-Flow Models for Storm Sewers Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27

Notes :

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ID - 2031 LB - YNen1326

Transient simulation of two-phase flows in pipes Type Auteur Auteur Auteur Auteur URL Volume Pages Publication Date Loc. dans l'archive Extra DOI Résumé

Article de revue J. M. Masella Q. H. Tran D. Ferre C. Pauchon http://\\anpi0733\ynen$\YNen890.pdf 24 739-755 International Journal of Multiphase Flow 1998 WOS:000076460300003 5 10.1016/S0301-9322(98)00004-4 Transient simulation of two-phase gas-liquid flow in pipes requires considerable computational efforts. Until recently, most available commercial codes are based on the two-fluid model which includes one momentum conservation equation for each phase. However, in normal pipe flow operation, especially in oil and gas transport, the transient response of the system proves to be relatively slow. Thus it is reasonable to think that simpler forms of the transport equations might suffice to represent transient phenomena. Furthermore, these types of models may be solved using less time-consuming numerical algorithms. Titre abrégé Transient simulation of two-phase flows in pipes Date d'ajout mercredi 17 octobre 2012 12:39:27 Modifié le mercredi 17 octobre 2012 12:39:27


Wavy-to-slug flow transition in slightly inclined gas-liquid pipe flow Type Auteur Auteur Auteur

Article de revue E. Grolman N. C. J. Commandeur E. C. deBaat

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Auteur URL Volume Pages Publication Date Cote Loc. dans l'archive Extra Abrév. de revue DOI Titre abrégé Date d'ajout Modifié le


J. M. H. Fortuin ://A1996UD26300001 42 901-909 Aiche Journal 1996 Apr YNen923 WOS:A1996UD26300001 4 Aiche J. 10.1002/aic.690420402 Wavy-to-slug flow transition in slightly inclined gas-liquid pipe flow mercredi 17 octobre 2012 12:39:27 mardi 18 février 2014 13:13:53

Marqueurs : model, stability

Notes : UD263 AICHE J ID - 1554 LB - YNen923

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