Vapor outflow into vacuum from a pulse source of moderate intensity
N.Yu. Bykov, G.A. Lukianov
St.-Petersburg State Technical University, Russia
Pages: 235-245
Abstract
The method of direct simulation of Monte Carlo (DSMC) was applied for a study of axisymmetric outflow of monoatomic gas into vacuum from a short-pulse source for the range of Knudsen numbers which provides a flow pattern with transitional and free-molecular modes. This problem statement is the approximate model for laser ablation of a solid target into vacuum after impact of a short laser pulse of moderate intensity. The stages of outflow and dispersion were considered for corresponding states of the source turn-on and turn-off. The main emphasis was put on the study of flow structure, spatial and temporal evolution of gas dynamic parameters and laws of translational relaxation.
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