Accession Number : AD0479658

Title :   THE BHATNAGAR-GROSS-KROOK EQUATION AS AN APPROXIMATION OF THE BOLTZMANN EQUATION.

Descriptive Note : Interim rept.,

Corporate Author : POLYTECHNIC INST OF BROOKLYN NY DEPT OF AEROSPACE ENGINEERING AND APPLIED MEC HANICS

Personal Author(s) : Koga, Toyoki

Report Date : FEB 1966

Pagination or Media Count : 15

Abstract : The collision factor in the Bhatnagar-Gross-Krook equation, the B-G-K equation, is evaluated in comparison with the collision integral in the Boltzmann equation. The deviation of the B-G-K collision factor from the Boltzmann collision integral increases as the Knudsen number increases and the deviation of the state of a gas from thermal equilibrium becomes significant. An attempt is made to rationalize the status of the B-G-K equation as a physical law. (Author)

Descriptors :   (*KINETIC THEORY, STATISTICAL FUNCTIONS), STATISTICAL MECHANICS, ITERATIONS, PARTIAL DIFFERENTIAL EQUATIONS, KNUDSEN NUMBER, INTEGRAL EQUATIONS, GAS FLOW, APPROXIMATION(MATHEMATICS).

Subject Categories : Physical Chemistry
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE