Semi-empirical boundary conditions for strong evaporation of a polyatomic gas | Zendy

P. А. Skovorodko | Zendy

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Semi-empirical boundary conditions for strong evaporation of a polyatomic gas

Author(s) -

P. А. Skovorodko

Publication year - 2001

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.1407613

Subject(s) - polyatomic ion , evaporation , monatomic ion , transonic , thermodynamics , monatomic gas , flow (mathematics) , momentum (technical analysis) , enthalpy , boundary (topology) , boundary value problem , mechanics , materials science , chemistry , physics , molecule , mathematics , aerodynamics , mathematical analysis , finance , quantum mechanics , economics , organic chemistry

Semi-empirical procedure of obtaining the boundary conditions for strongevaporation of a polyatomic gas from a plane surface is proposed. The procedureis based on specifying the dependencies of specific momentum and enthalpy ofthe flow from the gas flow rate. The latter are derived from the analysis ofthe available data concerning the evaporation of polyatomic and monatomicgases. The procedure predicts the exactly sonic terminal velocity of the flowand leads to some corrections of existing boundary conditions in transonicregion. Thus, for j = 2 and sonic flow the corrections for pressure,temperature and fraction of back-scattered molecules are about 0.7%, -3% and-8%.

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