The presence of a diffusing surfactant in combined surface tension-buoyancy driven convection is studied numerically to examine its influence on the flow structure and heat transfer characteristics of a fluid contained within a cavity. By accounting for the surface tension dependence on both temperature and surfactant concentration, the free surface may become stagnant. As a result, the high local and overall heat transfer rates at the cold wall, which are associated with thermal surface tension-augmented buoyancy driven flows, are decreased.

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