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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

MOLECULAR DYNAMICS STUDY ON NON-EQUILIBRIUM INTERPHASE MASS TRANSFER BETWEEN LIQUID AND VAPOR

Get access (open in a dialog) DOI: 10.1615/IHTC11.3950
pages 361-366

Abstract

Non-equilibrium condensation and evaporation phenomena are examined to establish molecular boundary conditions at a liquid-vapor interface for a kinetic theory on interphase mass transfer. The boundary conditions on condensing, reflecting and evaporating molecules have been obtained using molecular dynamics simulations for an equilibrium system of argon molecules and the condensation coefficient is summarized as a function of surface-normal component of translational energy and liquid surface temperature. Velocity distributions of evaporated and reflected molecules are also presented by modified Maxwellian utilizing the condensation coefficient. The effects of non-equilibrium conditions are discussed based on the molecular dynamics simulation for the non-equilibrium system and it is concluded that the non-equilibrium interphase mass transfer can be expressed by applying the molecular boundary conditions developed for the equilibrium system. In fact, by using these boundary conditions, the direct simulation Monte Carlo (DSMC) analysis has been made to obtain the condensation rate.