Results 261 to 270 of about 15,385 (307)

Critical liquid flows for the transition from the pseudo-slug and stratified patterns to slug flow

International Journal of Multiphase Flow, 2003
Abstract 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.
A. Soleimani, T.J. Hanratty
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Slug flow in fluidised beds

Powder Technology, 1967
The paper begins by summarising theory and experimental data concerning the rate of rise of a large gas bubble or slug through an inviscid liquid in a vertical tube, or between two flat plates. Experimental data show that the theory can be used to predict the rise of slugs in fluidised beds.
P.S.B. Stewart, J.F. Davidson
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BUBBLY-TO-SLUG TRANSITION IN VERTICAL FLOWS

Multiphase Science and Technology, 2003
Alternative mechanisms for the bubble-to-slug transition in vertical flows are discussed. Linking the transition to void wave formation has tended to replace earlier hypotheses of bubble coalescence but neither is consistent with all the observations. Thus, several fundamental questions remain.
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Effect of Boundary Conditions, Flow Rate, Slug Length, and Slug Frequency on Slug Flow Induced Vibration in a Pipeline Span

Offshore Technology Conference, 2013
Abstract This paper expands on the work described in OTC 22935 (Slug Flow Induced Vibration in a Pipeline Span, a Jumper, and a Riser Section [1]). Different boundary conditions of the pipeline span, flow rates, slug lengths, and slug frequencies are investigated for slug flow induced vibration of the pipeline span ...
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Two-Phase Slug Flow

Journal of Heat Transfer, 1961
Entrance effects can persist for great lengths, L/D = 300, and long times, in developing two phase flows. Wall shear stresses at moderate and low velocities contribute only slightiy to the pressure drop in slug flows. Bubblerise velocities in slug flow are quite sensitive to the velocity profile in the water ahead of the bubbles.
Peter Griffith, Graham B. Wallis
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Film and slug behaviour in intermittent slug–annular microchannel flows

Chemical Engineering Science, 2010
Abstract Whilst there are numerous experimental, theoretical and computational studies of Taylor flow in microchannels, the intermittent slug–annular regime has largely been neglected. In this paper time-resolved micro-PIV data are collected and used to study the flow characteristics of a gas–liquid system for flow regimes spanning Taylor to annular ...
T.S. Fouilland, D.F. Fletcher, B.S. Haynes   +2 more
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Experimental Study of the Slug Flow

2011
Slug flow is the flow pattern that more often is presented in two-phase flow. It has a complex physical configuration which has not been totally understood. For decades slug flow has been modeled by mechanistic approach with the use of the slug-unity concept. For this, slug length must be known.
O. C. Benítez-Centeno, O. Cazarez-Candia, S. L. Moya-Acosta   +2 more
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Investigation of flow structures in vertical slug flow

Nuclear Engineering and Design, 1997
Abstract The flow structure of gas–liquid slug flow in a vertical tube has been investigated experimentally and numerically. A photochromic dye activation method was used to obtain two-dimensional liquid velocity profiles around a Taylor Bubble rising in stagnant kerosene in a vertical 25.6 mm I.D. pipe.
M. Kawaji, J.M. DeJesus, G. Tudose
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Characteristics of the Liquid Slug and the Taylor Bubble in a Vertical Slug Flow

Heat Transfer: Volume 5 — Numerical and Experimental Methods in Heat Transfer, 1998
Abstract Measurements in vertical upward concurrent slug flows are presented. The experiments, carried with mixtures of air and water and a viscous aqueous solution, were aimed to the characterization of the structures that form the slug flow. Double-wire conductive probes were carefully designed and calibrated to identify and to measure
Daniel C. Pedroso, Fernando A. França, Eugenio S. Rosa   +2 more
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Slug flow modelling

2021
Une meilleure prédiction de la perte de charge et de la quantité de liquide dans les modèlesvisant à caractériser les écoulements de type poches-bouchons nécessite une étude appro-fondie du mouvement et de l’hydrodynamique des poches de gaz allongées se trouvanten conduite. La région à phases séparées, i.e. celle de la poche de gaz, est essentielledans
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