The instability of an evaporating binary mixture underlying its own vapor in an enclosed container is investigated. The fluid dynamics of both liquid and vapor phases, in the absence of gravity, are taken into account as also a deflecting interface. It is concluded from calculations, exemplified by a low weight alcohol mixture, that unlike single component systems a non-dilute binary mixture can become unstable only when it is heated from the vapor side. This instability is caused by solutal Marangoni convection that is triggered in the presence of phase change.
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