Multiple Solutions of Double-Diffusive Convection in Porous Media due to Opposing Heat and Mass Fluxes on Vertical Walls

Journal of Thermal Science and Technology

卷:8

Yoshio MASUDA¹  Michio YONEYA¹  Shigeo KIMURA² 

[1] Advanced Industrial Science and Technology (AIST);

[2] Institute of Nature and Environmental Technology, Kanazawa University;

关键词: double diffusion;    porous media;    analytical solution;    numerical solution;    multiple solutions;   

DOI  :  10.1299/jtst.8.533

来源: DOAJ

【 摘 要 】

The double-diffusive convection in a porous medium due to the opposing heat and mass fluxes on the vertical walls is solved analytically. In the former analysis, we investigated only when ω < π, the parameter arising from a combination among the density stratification and the buoyancy effects. However, it is shown in the present research that a solution is also possible when ω > π. The Sherwood number Sh is shown to decrease monotonically with an increase in the buoyancy ratio N when ω > π, and Sh approaches 1 when N is 1. We define Nmin as the minimum value of N when Ω is imaginary and ω = π. Nmin increases with an increase in Rc. However, Nmin approaches a constant as Le increases. Furthermore, although the convection pattern is mainly temperature-driven, concentration-driven convection cells also exist under certain.

【 授权许可】

Unknown