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Similar to pure fluids, physical properties of a binary fluid mixture alsoexhibit singularities close to its critical point, especially when it isdilute. The numerical and theoretical results presented in this paper identifythat the piston effect, a rapid energy transfer phenomenon, can be induced byboundary mass transfer in a confined near-critical binary fluid mixture. Due tothe Dufour effect, both the concentration and temperature variations areresponsible for the strong expansion of the boundary layer, which provokes anacoustic wave propagating in the fluid, leading to a gradual increase of thetemperature, pressure and density. The detailed analysis implies that such amixed piston effect can be approximated as a direct superposition of theirrespective effects in the perspective of energy transformation.

The piston effect induced by mass transfer in a binary fluid mixture near the critical point