Abstract
We apply a molecular dynamics (MD) technique to the simulation of a quasi-one-dimensional unsteady free expansion to determine the dominant microscopic mechanisms of condensation in supersonic flows. In this way, it is possible to reproduce the basic physics of the coupled condensation flow with a moderate computational effort. The MD results confirm that the fundamental mechanism for the initiation of condensation is through dimer formation in two-stage ternary collisions of monomers.
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