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颗粒群绕流传质特性的格子Boltzmann 模拟
1.中国科学院过程工程研究所 多相复杂系统国家重点实验室,北京 100190;
2.江西理工大学 资源与环境工程学院,江西 赣州 341000
Numerical Simulation of Flow Around Particles on Mass TransferBetween Gas and Particles by Lattice Boltzmann Method
1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 2. Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
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摘要 为考察气固两相流中颗粒团聚对气固传质过程的影响,采用耦合传质的格子Boltzmann模型对在空间均匀分布的颗粒结构和非均匀分布的颗粒团聚物结构条件下的绕流过程进行了直接数值模拟,得到了气体绕颗粒流动的速度分布和伴随流动的浓度分布,发现颗粒团聚物对绕流过程的速度分布和浓度分布都具有明显的影响。通过对颗粒绕流的气固传质过程进行定量分析发现,在两种结构条件下计算得到的传质舍伍德数均随着雷诺数的增大而呈指数函数形式增大,并且在均匀结构条件下的传质舍伍德数一般为非均匀结构条件下的3~5倍,颗粒团聚物的存在将严重影响颗粒绕流过程的气固传质效率。通过格子Boltzmann方法建立的气固相间传质模型,可以为研究气固两相流介尺度结构的传递特性提供理论依据。
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王利民1
吴承优1
2
关键词 颗粒群绕流颗粒团聚物格子玻尔兹曼方法传质数值模拟    
Abstract:Direct numerical simulations for flow around the particles with homogeneous distribution structure and particle clusters with heterogeneous distribution structure were carried out by a lattice Boltzmann model coupled mass transfer. Distributions of velocity and solute concentration in the process of flow around the particles were numerically predicted, and both were significantly affected by the particle clusters. Based on the quantitative analysis for mass transfer of gas flow around the particles, it was found that the computed Sherwood numbers for two different structures were both exponentially increased with the increase of the Reynolds numbers. Furthermore, the Sherwood number for the particles with homogeneous distribution structure was 3-5 times as great as that for the particle clusters, which supported that the particle clusters would seriously affect the mass transfer efficiency between gas and solid in the process of flow around the particles. The established mass transfer model via lattice Boltzmann method can provide a theoretical guidance for the research of mass transfer for gas-solid two-phase flow with the meso-scale structure.
Key wordsflow around particles    particle cluster    lattice Boltzmann method    mass transfer    numerical simulation   
收稿日期: 2016-01-25     
基金资助:国家自然科学基金(91434113,21106155);中国科学院前沿科学研究重点计划(QYZDB-SSW-SYS029);国家重点基础研究发展计划(2015CB251402);中国科学院战略先导科技专项(XDA07080303)资助项目。
作者简介: 王利民(1979—),男,研究员。E-mail: lmwang@ipe.ac.cn。
引用本文:   
王利民1,吴承优1,2. 颗粒群绕流传质特性的格子Boltzmann 模拟[J]. 化学反应工程与工艺, 2016, 32(4): 289-296.
Wang Limin1,Wu Chengyou1,2. Numerical Simulation of Flow Around Particles on Mass TransferBetween Gas and Particles by Lattice Boltzmann Method[J]. 化学反应工程与工艺, 2016, 32(4): 289-296.
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