Abstract
Steady-state natural convection of a salt-water solution due to the combined horizontal temperature and concentration gradients is studied experimentally in rectangular enclosures of aspect ratio, 0.2 and 2.0. There appears to be two types of global fluid motion, i.e. a unicell flow pattern and a multilayer flow pattern depending on the relative magnitude of the buoyancy ratio. Formation and growth of a layered flow structure is visually observed. A larger number of layers appear in the case of the opposing thermal and solutal buoyancy forces than that of the cooperating case. Due to the double-diffusive nature of heat and salt, interesting temperature and concentration profiles are obtained in the multi-layer flow regime.
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