热质双扩散与流固共轭传热及吸附的LBM模拟

采用格子Boltzmann方法，基于孔隙尺度，对填有均匀介质的复合方腔顶盖驱动双扩散混合对流及流固共轭传热、吸附进行数值模拟.在孔隙率ε=0.79，普朗特数Pr=0.7，格拉晓夫数Gr=10⁴和路易斯数Le=1.0时，就不同浮升力比（-100≤Br≤100）和吸附率常数（0.001≤k₁≤0.005）对方腔内部热质传输的影响进行比较.给出流线、等温线、等浓度线、平均努赛尔数Nu_av、舍伍德数Sh_av和吸附量等.结果表明Br通过改变介质所处流场的浓度分布影响吸附，而k₁的增加显著地提高吸附效率和吸附能力.

LBM Simulation of Heat and Mass Double Diffusion,Fluid-Solid Conjugate Heat Transfer and Adsorption

We adopted lattice Boltzmann method to simulate double diffusion mixed convection, fluid-solid conjugate heat transfer and adsorption process in a lid-driven composite enclosure filled with homogeneous medium at pore scale. Influences of buoyancy ratio Br (-100 ≤ Br ≤ 100) and adsorption rate constant k₁ (0.001 ≤ k₁ ≤ 0.005) on characteristics of heat and mass transfer were compared at porosity ε=0.79, Prandtl number Pr=0.7, Grashof number Gr=10⁴ and Lewis number Le=1.0. Streamlines, isotherms, isoconcentrations, adsorption capacity (C_S), average Nusselt number Nu_av and Sherwood number Sh_av of the left heated wall under different parameters were discussed in detail. It shows that Br affects adsorption by changing concentration distribution around medium in flow field; Increasing k₁ improves significantly adsorption efficiency and adsorption capacity.