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Thermophysics and Aeromechanics

2009 year, number 2

Modelling of condensation at spherical expansion of water vapor into vacuum

N.YU. Bykov
Center for Advanced Studies, St. Petersburg Polytechnic University,
Keywords: condensation, water vapor, direct statistic simulation, spherically expanding flow
Pages: 177-187


The mathematical model of water vapor condensation was developed for the direct simulation Monte Carlo method. This model describes a chain of reactions providing formation and decay of water clusters with consideration of accompanying energy transfer processes. One-dimensional expansion of water vapor into vacuum from an evaporating spherical surface was studied numerically within the range of parameters, corresponding to the flows transitional by the Knudsen number. The influence of condensation on the gas-dynamic pattern of the flow, including the parameters of the Knudsen layer, is discussed.