The Effect of Surface-Evaporation Kinetics on the Sublimation into a Boundary Layer.

by Andrew F. Charwat

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An exploration of the problem of coupling between the phase change of a sublimating surface and the flow near the leading edge. The behavior of the laminar binary boundary layer with blowing is coupled with the kinetic-evaproation-rate law of the surface material. It is found that the solution of this combined problem exhibits an asymptotic behavior at the large Reynolds number identified with the usual near-equilibrium solution in which the vapor near the wall is very nearly in the thermodynamic phase-change equilibrium. The near-equilibrium solution is invalid, however, in a region near the origin of the boundary layer characterized by a length formed with physical parameters describing the basic flow of the surface properties. In this region (here treated approximately), the blowing parameter decreases to zero, the wall temperature increases, and the sublimation rate tends to an upper limit as the origin of the boundary layer is approached

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