Transient Change of the Interface between Roll Cells in Double-Diffusive Natural Convection

概要

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When a two-layer system which consists of water (upper layer) and an aqueous solution (lower layer) is heated from a vertical side wall and cooled from an opposing side wall, convection starts in each layer. A Galerkin finite-element method was employed for the numerical analyses of the two-layer convection. Computations were carried out for the Prandtl number Pγ= 6, the Lewis number Le=100, the aspect ratio A=4, the Rayleigh number Ra=10^5 and the buoyancy ratio N=2,5 or 10. In the case of N=10, the intermediate concentration stratified layer was formed between two convection layers. In the case of N=5, two interfaces with very steep concentration gradient developed both at the top and at the bottom of the intermediate layer, especially near the walls. Later, the two interfaces were unified to a single sharp interface. In the case of N=2, first a single sharp interface was formed and later the interface was degraded by the fluid streaming into the other layer. The thickness of the interface was experimentally found to be dependent on the buoyancy ratio, confirming these characteristics.
一般社団法人日本機械学会の論文
1995-02-15