A USM-Θ two-phase turbulence model for simulating dense gas-particle flows |
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摘 要: |
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关 键 词: | 紊乱理论 二相流程 气固两相流 流体力学 |
收稿时间: | 23 June 2004 |
修稿时间: | 4 November 2004 |
A USM-Θ two-phase turbulence model for simulating dense gas-particle flows |
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Authors: | Yong?Yu Email author" target="_blank">Lixing?ZhouEmail author Baoguo?Wang Feipeng?Cai |
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Institution: | (1) Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China;(2) School of Mechanico-Electrical Engineering, Beijing Institute of Technology, Beijing, 100081, China;(3) Institute of Chemical Engineering, University of Petroleum, Beijing, 102249, China |
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Abstract: | A second-order moment two-phase turbulence model for simulating dense gas-particle flows (USM- model), combining the unified second-order moment two-phase turbulence model for dilute gas-particle flows with the kinetic theory of particle collision, is proposed. The interaction between gas and particle turbulence is simulated using the transport equation of two-phase velocity correlation with a two-time-scale dissipation closure. The proposed model is applied to simulate dense gas-particle flows in a horizontal channel and a downer. Simulation results and their comparison with experimental results show that the model accounting for both anisotropic particle turbulence and particle-particle collision is obviously better than models accounting for only particle turbulence or only particle-particle collision. The USM- model is also better than the k- -kp- model and the k- -kp- p- model in that the first model can simulate the redistribution of anisotropic particle Reynolds stress components due to inter-particle collision, whereas the second and third models cannot.The project supported by the Special Funds for Major State Basic Research of China (G-1999-0222-08), the National Natural Science Foundation of China (50376004), and Ph.D. Program Foundation, Ministry of Education of China (20030007028) |
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Keywords: | Turbulence Two-phase flow Second-order moment model |
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