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Numerical analysis of a shear layer between a cool liquid n-decanehydrocarbon and a hot oxygen gas at supercritical pressures shows that awell-defined phase equilibrium can be established. Variable properties areconsidered with the product of density and viscosity in the gas phase showing anearly constant result within the laminar flow region with no instabilities.Sufficiently thick diffusion layers form around the liquid-gas interface tosupport the case of continuum theory and phase equilibrium. While molecules areexchanged for both species at all pressures, net mass flux across the interfaceshifts as pressure is increased. Net vaporization occurs for low pressureswhile net condensation occurs at higher pressures. For a mixture of n-decaneand oxygen, the transition occurs around 50 bar. The equilibrium values at theinterface quickly reach their downstream asymptotes. For all cases, profiles ofdiffusing-advecting quantities collapse to a similar solution (i.e., functionof one independent variable). Validity of the boundary layer approximation andsimilarity are shown in both phases for Reynolds numbers greater than 239 at150 bar. Results for other pressures are also taken at high Reynolds numbers.Thereby, the validity of the boundary layer approximation and similarity areexpected. However, at very high pressures, the similar one-dimensional profilesvary for different problem constraints.

Two-phase developing laminar mixing layer at supercritical pressures