化工学报2012，Vol.63Issue(1)：25-35,11.DOI:10.3969/j.issn.0438-1157.2012.01.004
不可压热流体中气体传质扩散过程的LBM数值模拟
Numerical simulation of gas diffusion in an incompressible thermal fluid with lattice Boltzmann method
摘要
Abstract
It is of great significance to study the mass transfer and mixing of gas in natural convection flow caused by density gradient resulted from thermal conditions because chemical reactions mainly depend on the gas molecular concentration in fluids and the natural convection can strengthen the transport of gas molecules. The diffusion process of oxygen molecules is simulated with the natural convection developed in a simplified container, coupling with the effects of thermal and mass diffusion. On the basis of impressible flow of lattice Boltzmann (LB) model D2G9, a two-dimensional nine-speed lattice Boltzmann model D2Q9 of diffusion-natural convection is first built up to simulate the diffusion processes of heat energy and mass, with non-equilibrium extrapolation boundary scheme. Then the thermal natural convection and gas mass transfer process are simulated with three kinds of thermal boundary conditions in order to analyze and explorehow the thermal conditions influence the fluid flow and mass transfer of gas. The calculated results are consistent with the published data. The effect of thermal condition on the natural convection flow is analyzed and the differences in velocity distribution between the numerical data and published data are discussed. The thermal flow dependent mass transfer provides a basis for designing appropriate thermal conditions to control the chemical reaction processes.关键词
格子Boltzmann方法/双扩散对流模型/传热和传质Key words
lattice Boltzmann method/diffusion-convection model/heat and mass transfer分类
化学化工引用本文复制引用
雍玉梅,杨超,尹小龙,林军..不可压热流体中气体传质扩散过程的LBM数值模拟[J].化工学报,2012,63(1):25-35,11.基金项目
国家自然科学基金项目(20976177,20990224) （20976177,20990224）
国家杰出青年科学基金项目(21025627) （21025627）
国家重点基础研究发展计划项目(2009CB623406) （2009CB623406）
国家高技术研究发展计划项目(2011AA060704) （2011AA060704）
美国Corning公司经费资助项目. （）
