Evolution of the Shape of a Gas Cloud during Pulsed Laser Evaporation into Vacuum: Direct Simulation Monte Carlo and the Solution of a Model Equation

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Abstract

The dynamics of gas expansion during nanosecond laser evaporation into vacuum is studied. The problem is considered in an axisymmetric formulation for a wide range of parameters: the number of evaporated monolayers and the size of the evaporation spot. To obtain a reliable numerical solution, two different kinetic approaches are used—the direct simulation Monte Carlo method and solution of the BGK model kinetic equation. The change in the shape of the cloud of evaporated substance during the expansion process is analyzed. The strong influence of the degree of rarefaction on the shape of the forming cloud is shown. When a large number of monolayers evaporate, good agreement with the continuum solution is observed.

About the authors

A. A. Morozov

Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences; Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences

Email: morozov@itp.nsc.ru
630090, Novosibirsk, Russia; 119333, Moscow, Russia

V. A. Titarev

Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences

Author for correspondence.
Email: vladimir.titarev@frccsc.ru
119333, Moscow, Russia

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