科研之友
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摘要
A hybrid simulation method is employed to study the condensation of saturated argon vapor flowing tangentially across a stationary cooled substrate, at nanoscale resolution The method combines a direct simulation Monte Carlo treatment of the bulk vapor phase with a nonequilibrium molecular dynamics treatment of the condensed liquid and interphase regions, it provides an efficient simulation procedure for a heterogeneous system with a large ratio of vapor to liquid length scales Starting from a bare, crystalline solid wall, the condensation process evolves from a transient unsteady state to a quasisteady state, where interfacial properties and heat and mass transfer parameters are analyzed The Knudsen layer structure from the hybrid simulation is compared with kinetic theory predictions from a modified moment method analysis and from pure DSMC simulation The effects of condensation strength and a tangential flow velocity that is on the order of the condensation velocity are examined A comparison is made between the nonequilibrium results and equilibrium results for the interphase transition between liquid and vapor The results reveal the structure of the interphase for
- 出版日期2010-11
