Accession Number : AD0001911


Title :   HEAT TRANSFER FROM SPHERES TO A RAREFIED GAS IN SUBSONIC FLOW


Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH


Personal Author(s) : KAVANAU, L L ; DRAKE, R M , JR


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/001911.pdf


Report Date : 23 Jan 1953


Pagination or Media Count : 26


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.


Descriptors :   *HEAT TRANSFER , PROBES , TEMPERATURE , IMPACT , FORMULATIONS , AIR FLOW , SPHERES , PRESSURE MEASUREMENT , TUNNELS , BOUNDARIES , SOLUTIONS(GENERAL) , AXISYMMETRIC , SUBSONIC CHARACTERISTICS , FLOW , STATIC PRESSURE , TEST FACILITIES , CHAMBERS , CORRECTIONS , THERMAL RESISTANCE , HEAT TRANSFER COEFFICIENTS , RAREFACTION , PRANDTL NUMBER , SUBSONIC NOZZLES , TRAVERSING MECHANISMS


Subject Categories : Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE