Accession Number:

AD0419605

Title:

STUDY OF FREE CONVECTIVE HEAT TRANSFER AT EX TREMELY HIGH PRANDTL NUMBERS FROM HORIZONTAL HEATED CYLINDERS,

Descriptive Note:

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH

Personal Author(s):

Report Date:

1963-08-01

Pagination or Media Count:

74.0

Abstract:

This study dealt with transient heat transfer from heated horizontal cylinders to a hydrocarbon polymer of high viscosity. It had been predicted analytically that during transient free con vection the thermal boundary layer would grow in size during the conduction phase of the flow and then shrink to some steady state value as fluion began. It had also been predicted that the film heat transfer coefficient would reach a minium and then increase to some steady state value. A series of seven tests on one fourth inch diameter cylinders and six tests on wires of thirty-two hundreths inches in diam eter showed experimentally that the predictions occurred. The similiarity laws were shown to be applicable to steady state free convection from horizontal cylinders to the high viscosity fluid. From the plot of log Nusselt number vs log Prandtl x Grashof numbers an equation was obtained. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE