Study of Evaporative Convection in an Open Cavity under Shear Stress Flow |
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Authors: | Carlo S Iorio Olga Goncharova and Oleg A Kabov |
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Affiliation: | (1) California Institute of Technology, Graduate Aerospace Laboratories, Pasadena, CA, USA;(2) Department of Nuclear Engineering, University of California, Berkeley, CA, USA;(3) Department of Mechanical Engineering, University of California, Berkeley, CA, USA |
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Abstract: | When a layer of volatile liquid is exposed to a shear flow of inert gas, thermal patterns, in the form of interfacial ripples
and bulk plumes, are created by the combined action of evaporative, shear-driven and surface-tension-driven instabilities.
The topology of the interfacial thermal patterns is mainly influenced by the geometry of the evaporating surface, the thickness
of the evaporating layer, the intensity of the shear flow and by the physic-chemical properties of the working fluid. In this
paper, by means of numerical simulations, we focused our attention on the dynamics of the interfacial thermal patterns for
different working fluids and thicknesses of the volatile liquid layer. This study has been performed in the frame of the ESA
sponsored Space Program on heat and mass transfer CIMEX-1. The choice of the fluids—ethyl alcohol and FC72 (n-perfluorohexane)—the
reference values for the inert gas flow rate, the thickness of the liquid layer as well as the geometrical features of the
computational domain correspond exactly to the ones foreseen for the CIMEX-1 experiment. However, the main conclusions can
be considered of more general validity. |
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