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RESEARCH PAPERS

Extension of the Maximum Slope Method to Arbitrary Upstream Fluid Temperature Changes

[+] Author and Article Information
G. F. Kohlmayr

Pratt & Whitney Aircraft Division, United Aircraft Corporation, East Hartford, Conn.

J. Heat Transfer 90(1), 130-134 (Feb 01, 1968) (5 pages) doi:10.1115/1.3597442 History: Received March 13, 1967; Online August 25, 2011

Abstract

Locke’s maximum slope method for the reduction of transient heat transfer test data is extended to include arbitrary upstream fluid temperature changes. The analytical solution of the single-blow problem is used to evaluate maximum slopes which are shown to depend, in general, nonmonotonically on the number of transfer units, Ntu . It is shown that there is a critical number of transfer units, (Ntu )crit , such that, for Ntu > (Ntu )crit , the maximum slope method remains applicable. In illustration of the analysis, maximum slopes and maximum slope errors are presented for various upstream temperature changes deviating from the step change.

Copyright © 1968 by ASME
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