Premium
Heat transfer to water in turbulent flow in internally heated annuli
Author(s) -
Stein Ralph P.,
Begell William
Publication year - 1958
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690040203
Subject(s) - thermodynamics , heat transfer , turbulence , prandtl number , heat flux , heat transfer coefficient , reynolds number , mechanics , turbulent prandtl number , materials science , chemistry , physics , nusselt number
Nearly 900 values of local heat transfer coefficients were correlated for water flowing through long annuli 1/8, 1/4, and 3/8 in. wide, electrically heated at their inner surfaces and containing three spacer ribs. Both cosine and uniform lengthwise heat‐flux distributions were employed. All heat transfer coefficients were computed for positions corresponding to ( L/D e ) ratios larger than 150. Several methods of correlation were attempted and compared, especially with respect to the method of evaluating physical properties. The proportionality of the Colburn j factor to the Prandtl and Reynolds numbers with their usual exponents was verified, and the dependence of j upon D 2 / D 1 was analyzed. There was no significant effect of cosine heat‐flux distribution on the heat transfer coefficients. Evaluating physical properties at the usual film temperature gave the best correlation. A simplified dimensional equation for water at moderate temperatures and pressures was also developed.