In the present study, the onset of Marangoni convection in a liquid layer overlaying a porous layer where the whole system is being laterally heated is investigated. Two different cases are analyzed in this paper. In the first case, the Marangoni convection in the absence of the Soret effect is studied. Results revealed, when the liquid layer and the porous layer have identical thickness, the convective flow remains in the liquid layer. However, the flow covers the entire cavity when the liquid layer thickness is very small (less than 1/10th of the porous layer). For the case of Marangoni convection in the presence of Soret effect, it has been found that the isopropanol component enriches near the cold wall.

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