Accession Number : AD0640872

Title :   KINETIC THEORY OF THERMAL CONDUCTION IN A COLLISIONLESS GAS.

Descriptive Note : Interim rept.,

Corporate Author : PRINCETON UNIV N J GAS DYNAMICS LAB

Personal Author(s) : Wu,Yau

Report Date : JUN 1966

Pagination or Media Count : 34

Abstract : The kinetic theory of thermal conduction in a collisionless gas in an arbitrary closed system was developed. The pressure, density, temperature and isotropicity (I) in the system are not uniformly distributed in general, but PI/square root of T and n (square root of TI) are invariants throughout the whole region according to the revised law of thermal transpiration developed recently by Wu. The thermal conductance was defined as a matrix in a multicomponent system. It is not only linearly dependent on the mean density in the system at a given temperature distribution on the boundary, but is also dependent on the geometry and the reflection law on the boundary of the system. Several geometries were considered, such as parallel plates, triangular parallel plates, cubes, polygons, polygonal parallel plates and others. A similarity law was established showing equivalence among the systems of different geometries. (Author)

Descriptors :   (*THERMAL CONDUCTIVITY, KINETIC THEORY), (*GAS FLOW, THERMAL CONDUCTIVITY), RAREFIED GAS DYNAMICS

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE