Effect of drag force on backward-facing step gas-particle turbulent flows

被引:0
|
作者
Yang Liu
Fuwei Jiang
Xiangli Li
Guohui Li
机构
[1] Dalian Maritime University,Marine Engineering College
[2] Dalian University of Technology,Faculty of Infrastructure Engineering
[3] Dalian Jiaotong University,School of Electronic and Information Engineering
来源
Heat and Mass Transfer | 2014年 / 50卷
关键词
Large Eddy Simulation; Particle Phase; Granular Temperature; Particle Kinetic Energy; Phase Doppler Particle Analyzer;
D O I
暂无
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学科分类号
摘要
An improved drag force coefficient of gas-particle interaction based on the traditional Wen’s 1966 model is proposed. In this model, a two-stage continuous function is used to correct the discontinuous switch when porosity less than 0.2. Using this proposed correlation and the Wen’s 1966 model, a gas-particle kinetic energy and particle temperature model is developed to predict the hydrodynamic characteristics in backward-facing step gas-particle two-phase turbulent flows. Numerically results showed that they are in good agreement with experiment measurements and presented model are better due to a improvement of momentum transport between gas and particle phases. Particle dispersions take on the distinctively anisotropic behaviors at every directions and gas phase fluctuation velocity are about twice larger than particle phases. Particle phase has a unique transportation mechanism and completely different from the gas phase due to different density. Furthermore, the correlation values of axial–axial gas-particle are always greater than the radial–radial values at fully flow regions. The gas-particle two-phase interactions will make influence on two-phase turbulent flow behaviors.
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页码:803 / 811
页数:8
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