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.
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