| Transitional phenomenon of particle dispersion in gas-solid two-phase flows |
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| 引用本文： | LUO Kun FAN JianRen CEN KeFa. Transitional phenomenon of particle dispersion in gas-solid two-phase flows[J]. 科学通报(英文版), 2007, 52(3): 408-417. DOI: 10.1007/s11434-007-0055-x |
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| 作者姓名： | LUO Kun FAN JianRen CEN KeFa |
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| 作者单位： | State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 50506027）.Thanks are due to Dr. M. Klein for his great help and to the anonymous referees for their comments which have improved this work. |
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| 摘 要： | Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement be-tween the statistical results of flow field and the related experimental data. In the study of particle dis-persion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.
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| 关 键 词： | 气固两相流 颗粒分散 瞬变现象 湍流模型 直接数值模拟 |
| 收稿时间： | 2006-07-07 |
| 修稿时间： | 2006-07-072006-10-13 |
Transitional phenomenon of particle dispersion in gas-solid two-phase flows |
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| Luo Kun,Fan JianRen,Cen KeFa. Transitional phenomenon of particle dispersion in gas-solid two-phase flows[J]. Chinese science bulletin, 2007, 52(3): 408-417. DOI: 10.1007/s11434-007-0055-x |
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| Authors: | Luo Kun Fan JianRen Cen KeFa |
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| Affiliation: | (1) State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement be-tween the statistical results of flow field and the related experimental data. In the study of particle dis-persion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers. |
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| Keywords: | direct numerical simulation gas-solid two-phase flows coherent structures particle dispersion transition |
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