Journal ArticleDOI
The mechanism of bubble non-homogeneous distribution in two-phase shear flow
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In this article, the double peaks of void fraction radial profiles were analyzed by the bubble deposition model and it was found that bubbles segregation according to their size is an important phenomenon which contributes to bubble non-homogeneous distribution in vertical upward two-phase shear flow.About:
This article is published in Nuclear Engineering and Design.The article was published on 1990-03-02. It has received 37 citations till now. The article focuses on the topics: Bubble & Shear flow.read more
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Dissertation
Computational fluid dynamics of dispersed two-phase flows at high phase fractions
TL;DR: In this paper, the authors describe the development and validation of Computational Fluid Dynamics (CFD) methodology for the simulation of dispersed two-phase flows, which employs averaged mass and momentum conservation equations to describe the time-dependent motion of both phases.
Journal ArticleDOI
Modeling of Vertical Bubble-Driven Flows
TL;DR: In this paper, a detailed overview of verified forces acting on bubbles is given, and examples of both classical and more recent modeling approaches are shown, including gravity, buoyancy, centrifugal forces, conventional Magnus and Saffman forces, and added mass as well as turbulent migration and other instability mechanisms.
Journal ArticleDOI
Effect of interfacial forces and turbulence models on predicting flow pattern inside the bubble column
TL;DR: In this paper, the effect of various interfacial forces and turbulence models on gas-liquid velocity and gas hold-up in bubble column is critically reviewed, and the authors make an effort to show suitable interfacial force i.e., drag force, lift force, turbulent dispersion models and virtual mass and turbulence model such as standard k-ɛ model, Reynolds stress model, Large Eddy Simulation to predict flow pattern inside the bubble column using Eulerian-Eulerian.
Journal ArticleDOI
A model for turbulent polydisperse two-phase flow in vertical channels
TL;DR: In this paper, a polydisperse two-phase flow model is developed and used to analyze the effect of the bubble size on the radial phase distribution in vertical upward channels, where the model accounts for interfacial momentum transfer terms arising from drag, lift, turbulent dispersion and wall forces for the different bubble sizes.
Journal ArticleDOI
Large eddy simulation of a bubble column using dynamic sub-grid scale model
TL;DR: In this paper, two sub-grid scale models based on the Smagorinsky kernel in both its original form and the dynamic procedure of Germano are presented, and an extended k-e turbulence model is used with extra source terms introduced to account for the interaction between the bubbles and the liquid.
References
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Journal ArticleDOI
3-D turbulence structure and phase distribution measurements in bubbly two-phase flows
TL;DR: In this article, the authors measured important flow quantities such as local void fraction, liquid velocity and the Reynolds stresses using both single-sensor and three-Sensor hot-film anemometer probes, and found that the observed wall peaking and coring phenomena in up and down flows could be predicted by considering the turbulence structure of the continuous phase and lateral lift force acting on the dispersed phase.
Journal ArticleDOI
Turbulence structure of air-water bubbly flow—II. local properties
TL;DR: In this paper, microstructure was studied experimentally in air-water two-phase bubbly flow flowing upward in a vertical pipe of 60 mm diameter under atmospheric pressure, and the results indicated that over a large portion of fully-developed bubbles, the phases, the velocities of bubbles and water, and ratio between the velo-ities of the phases have fairly flat radial profiles.
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