Accession Number:

AD0001911

Title:

HEAT TRANSFER FROM SPHERES TO A RAREFIED GAS IN SUBSONIC FLOW

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1953-01-23

Pagination or Media Count:

26.0

Abstract:

Over-all average heat transfer data from spheres to a rarefied air stream for 0.1 or M or 0.69 and 1.7 or Re or 124 are presented with a simplified analysis which predicts the trends of this data by a rarefaction correction to the continuum solution. An axisymmetric, subsonic nozzle was used in the investigation giving a static pressure range of 36 to 3300 mu Hg. Four spheres and an impact pressure probe were mounted on a rotary selector which was supported in the tunnel test chamber by a traversing mechanism capable of axial, lateral, and vertical movement with respect to the nozzle. A semi-empirical formulation of the Nusselts number for spheres in a rarefied subsonic air stream is obtained by correcting the continuum solution for an effective thermal contact resistance due to the temperature jump boundary condition. The result appears as a function of the dimensionless local heat transfer coefficient for continuum flow and the local Mach, Reynolds and Prandtl number.

Subject Categories:

  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE