Accession Number : AD0631737

Title :   THEORY OF THERMAL CONDUCTANCE IN A COLLISIONLESS GAS,

Corporate Author : PRINCETON UNIV N J GAS DYNAMICS LAB

Personal Author(s) : Wu,Yau

Report Date : JUN 1965

Pagination or Media Count : 31

Abstract : The theory of thermal conductance in a collisionless gas in an arbitrary closed system has been 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 theory of thermal transpiration developed recently by Wu. The thermal conductance has been defined as a matrix in a multi-component system. It is not only linearly dependent on the mean density in the system at a given temperature distribution on the boundary, but also depends on the geometry and the reflection law on the boundary of the system. Several geometries have been considered, such as triangular parallel plates, cubes, polygons, polygonal parallel plates and others. A similarity law has been established showing equivalence among the systems of different geometries. (Author)

Descriptors :   (*THERMAL CONDUCTIVITY, THEORY), (*GASES, THERMAL CONDUCTIVITY), EQUATIONS OF STATE, MATHEMATICAL ANALYSIS, INVARIANCE

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE