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The International Conference on Multiphase Systems, ICMS'2000
Ufa, RUSSIA, June 15-17, 2000

Boundary Conditions (Pressure at the Interface) During Evaporation

Moloshnikov A. S., Chmal I. I.

Electrogorsk, Moscow Region, 142530, RUSSIA

A distinction is made between two boundary conditions for interface:

1. The reactive pressure component of generated vapor in the hydrodynamic approximation.

2. Molecular momentum transport.

Its ratio is approximately equal to Mach number for generated vapor flow. The "hydrodynamic" boundary condition can not be correctly applied in the cases of relatively low evaporation intensity (film boiling, nucleate boiling) because it underestimates evaporation pressure component at the interface about 3-4 orders of magnitude.

The molecular momentum transport correlation has been used in analyzing the evaporation front and bubble dynamics. Calculation results are in good agreement with the data of other authors.