HEAT TRANSFER FROM SPHERES TO A RAREFIED GAS IN SUBSONIC FLOW
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 1953
- Accession Number
- AD0001911
Entities
People
- L. L. Kavanau
- R. M. Drake Jr.
Organizations
- University of California, Berkeley