Convective heat transfer from hightemperature air inside a tube
作者:
Herbert E. Zellnik,
Stuart W. Churchill,
期刊:
AIChE Journal
(WILEY Available online 1958)
卷期:
Volume 4,
issue 1
页码: 37-42
ISSN:0001-1541
年代: 1958
DOI:10.1002/aic.690040108
出版商: American Institute of Chemical Engineers
数据来源: WILEY
摘要:
AbstractLocal rates of convective heat transfer from air at high temperature to a cold wall were measured in the inlet region of a circular tube. Air entered the tube with a flat velocity and temperature profile at temperatures from 480° to 2,000°F. and flow rates corresponding to Reynolds numbers from 4,500 to 22,500. The inner surface of the 1.0‐in. I.D. tube was maintained at approximately 100°F. by water cooling. Local rates of heat transfer were determined at 1.5, 4, 7, and 10 tube diameters from the entrance by measuring the radial temperature profile in thermally isolated, annular sections of the tube wall.The local rate data for all gas temperatures are well represented by previous correlations for small temperature differences if the gas properties are evaluated at the bulk temperature rather than at the film temperature. The data agree well with the data of previous investigators wherever the experimental ranges ove
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