Journal ArticleDOI
Modelling flow pattern transitions for steady upward gas-liquid flow in vertical tubes
TLDR
In this paper, the authors developed models for predicting flow pattern transitions during steady gas-liquid flow in vertical tubes based on physical mechanisms suggested for each transition, incorporating the effect of fluid properties and pipe size.Abstract:
Models for predicting flow pattern transitions during steady gas-liquid flow in vertical tubes are developed, based on physical mechanisms suggested for each transition. These models incorporate the effect of fluid properties and pipe size and thus are largely free of the limitations of empirically based transition maps or correlations.read more
Citations
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Journal ArticleDOI
Fundamental issues related to flow boiling in minichannels and microchannels
TL;DR: In this article, the effects of the channel size on the flow patterns and heat transfer and pressure drop performance are reviewed in small hydraulic diameter channels, and the fundamental questions related to the presence of nucleate boiling and characteristics of flow boiling in microchannels and minichannels in comparison to that in the conventional channel sizes (3 mm and above) are addressed.
Journal ArticleDOI
Gas–liquid two-phase flow in microchannels Part I: two-phase flow patterns
TL;DR: In this paper, a systematic experimental investigation of two-phase flow patterns in microchannels was the objective of this study, using air and water, experiments were conducted in circular micro channels with 1.1 and 1.45mm inner diameters, and in semi-triangular (triangular with one corner smoothed) cross-sections with hydraulic diameters 1.09 and 149mm.
Journal ArticleDOI
Flow regime transition criteria for upward two-phase flow in vertical tubes
Mishima Kaichiro,Mamoru Ishii +1 more
TL;DR: In this paper, new flow-regime transition criteria for upward gas-liquid flow in vertical tubes have been developed considering the mechanisms of flowregime transitions, which can be compared to existing criteria and experimental data under steady-state and fully developed flow conditions by using relative velocity correlations.
Journal ArticleDOI
A unified model for predicting flow-pattern transitions for the whole range of pipe inclinations
TL;DR: In this article, models for predicting flow-pattern transitions in steady gas-liquid flow in pipes are summarized and presented, incorporating the effect of fluid properties, pipe size and the angle of inclination in a unified way.
Journal ArticleDOI
Monoliths in Heterogeneous Catalysis
TL;DR: Structured catalysts are promising as far as elimination of these setbacks is concerned as discussed by the authors, however, conventional fixed-bed reactors have some obvious disadvantages such as maldistributions of various kinds (including a nonuniform access of reactants to the catalytic surface), high pressure drop in the bed, etc.
References
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Journal ArticleDOI
A model for predicting flow regime transitions in horizontal and near horizontal gas-liquid flow
Yemada Taitel,A. E. Dukler +1 more
TL;DR: In this article, a generalized flow regime map based on this theory is presented, which is used for determining flow regime transitions in two-phase gas-liquid flow, and the mechanisms for transition are based on physical concepts and are fully predictive.
Journal ArticleDOI
Fundamentals of the hydrodynamic mechanism of splitting in dispersion processes
TL;DR: In this paper, Taylor's experiments on the breakup of a drop in simple types of viscous flow, (b) breakup of an air stream, and (c) emulsification in a turbulent flow are studied.
Journal ArticleDOI
The mechanics of large bubbles rising through extended liquids and through liquids in tubes
TL;DR: In this article, the authors describe measurements of the shape and rate of rise of air bubbles varying in volume from 1·5 to 200 cm. 3 when they rise through nitrobenzene or water.
Journal ArticleDOI
A theoretical basis for the Lockhart-Martinelli correlation for two-phase flow
TL;DR: In this article, the friction pressure gradient during the flow of gas-liquid or vapour-liquid mixtures in pipes is derived in terms of the Lockhart-Martinelli correlating groups.
Journal ArticleDOI
Velocity of large drops and bubbles in media of infinite or restricted extent
TL;DR: In this paper, a simple method of calculating the terminal velocity of fluid particles moving in media of either infinite or restricted extent was proposed. But this method was not suitable for the case of liquid drops falling through gaseous media and gave only a rough approximation.
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Flow regime transition criteria for upward two-phase flow in vertical tubes
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