Study of entropy decrease phenomenon in shock layer

2020 ◽  
Vol 34 (14n16) ◽  
pp. 2040117
Author(s):  
Jin-Duo Chen ◽  
Ai-Ming Shi ◽  
Tong Shen
Keyword(s):  
Shock Wave ◽  
Distribution Function ◽  
Shock Layer ◽  
Physical Mechanism ◽  
Velocity Distribution Function ◽  
Direct Simulation ◽  
Number Density ◽  
Statistical Entropy ◽  
Mass System ◽  
Argon Gas

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.

The velocity distribution function within a shock wave

1967 ◽  
Vol 30 (3) ◽  
pp. 479-487 ◽  
Author(s):  
G. A. Bird
Keyword(s):  
Shock Wave ◽  
Distribution Function ◽  
Velocity Distribution ◽  
Numerical Experiments ◽  
Equilibrium Distribution ◽  
Velocity Distribution Function ◽  
Distribution Functions ◽  
Rigid Sphere ◽  
Lateral Velocity ◽  
Shock Profile

The structure of normal shock waves in a gas composed of rigid sphere molecules is investigated by numerical experiments with a simulated gas on a digital computer. The non-equilibrium between the temperatures based on the longitudinal and lateral velocity components is studied and the results compared with the theory of Yen (1966). Details of the velocity distribution function are presented for a shock of Mach number 10. The distribution functions for both the longitudinal and lateral velocity components are plotted for a number of locations in the shock profile and are compared with the equilibrium distribution.

The velocity distribution function in an infinitely strong shock wave

2000 ◽  
Vol 12 (8) ◽  
pp. 2116-2127 ◽  
Author(s):  
Shigeru Takata ◽  
Kazuo Aoki ◽  
Carlo Cercignani
Keyword(s):  
Shock Wave ◽  
Distribution Function ◽  
Velocity Distribution ◽  
Strong Shock ◽  
Velocity Distribution Function ◽  
Strong Shock Wave

scholarly journals On the Goodness of Different Mass Estimators from N-body Simulations

1988 ◽  
Vol 130 ◽  
pp. 558-558
Author(s):  
J Perea ◽  
A. del Olmo ◽  
M. Moles
Keyword(s):  
Distribution Function ◽  
Mass Spectrum ◽  
Velocity Distribution ◽  
Initial Conditions ◽  
Velocity Distribution Function ◽  
Initial Configuration ◽  
Number Density ◽  
Type Mass

N-body models were run in order to test the mass estimators considered by Heisler, Tremaine and Bahcall (1985, HTB), when systems with a large number of mass-points with a non-flat mass-spectrum are considered. The initial conditions of the models were a analytic King profile for the number density, a Gaussian velocity distribution function and a Schechter-type mass spectrum. The models were left to evolve from a far from virial initial configuration, so a violent collapse occurs before the system reachs equilibrium. The code we use was NBODY2 code kindly provided to us by Dr. S. Aarseth.

scholarly journals Velocity distribution function of hydrogen atoms in ion source discharges

2021 ◽  
Author(s):  
Tatsuhiro Tokai ◽  
Yuji Shimabukuro ◽  
Hidenori Takahashi ◽  
Keita Bito ◽  
Motoi Wada
Keyword(s):  
Distribution Function ◽  
Velocity Distribution ◽  
Velocity Distribution Function ◽  
Ion Source ◽  
Hydrogen Atoms

scholarly journals Velocity distribution function of spontaneously evaporating atoms

2020 ◽  
Vol 5 (10) ◽  
Author(s):  
Sergiu Busuioc ◽  
Livio Gibelli ◽  
Duncan A. Lockerby ◽  
James E. Sprittles
Keyword(s):  
Distribution Function ◽  
Velocity Distribution ◽  
Velocity Distribution Function
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