Applications of Fluid MechanicsNo Access

Study of entropy decrease phenomenon in shock layer

Department of Fluid Mechanics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China

Department of Fluid Mechanics, NPU-Duke Joint Laboratory Light Pressure Propulsion and Solar Sail Dynamics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China

E-mail Address: sam@nwpu.edu.cn

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Tong Shen

School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China

E-mail Address: 452377952@qq.com

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https://doi.org/10.1142/S0217979220401177Cited by:0 (Source: Crossref)

This article is part of the issue:

Special Issue — Proceedings of the Eighth International Symposium on Physics of Fluids (ISPF8), 10–13 June, 2019, Xi'an, China

Abstract

An entropy decrease phenomenon in the shock wave is studied. The statistical entropy of a unit mass system (UMS) is constructed based on statistical mechanics. Two terms in the microscopic statistical entropy are connected with the macroscopic entropy increment. In order to obtain the number density and velocity distribution function of argon gas, the direct simulation Monto Carlo method is adopted. The physical mechanism for entropy decrease phenomenon in the shock layer is revealed as compression work winning internal energy to produce the heat loss of a UMS.

Keywords:

PACS: 05.70.-a, 34.10.+x, 47.40.Nm

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