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An experimental investigation of the influence of the grain size of the metal surface on pool boiling heat transfer
Author(s) -
Nagarajan R.,
Adelman Maurice
Publication year - 1970
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450480108
Subject(s) - boiling , nucleate boiling , nucleation , brass , grain size , materials science , copper , heat transfer , thermodynamics , heat transfer coefficient , metal , metallurgy , physics
The influence of the grain size of metallic surfaces on nucleate boiling was investigated experimentally. Surfaces of electrodeposited copper, nickel, brass and chromium were studied with particular emphasis on copper (146 grains per inch to 1678 grains per inch). The pool boiling heat transfer studies were conducted by transferring heat produced electrically through a 6‐in. diameter heating surface to a pool of boiling water contained in a glass boiler. A log‐log plot of the Q/A versus δT m data showed a definite effect of the grain size of the surface on nucleate boiling heat transfer, the heat transferred at a given δT m increasing as the grain size increased. For copper plated surfaces, the Rohsenow Equation for nucleate pool boiling gave values for C st and r , which showed a linear relationship when plotted separately against the number of grains per unit length of the surface. A slightly modified form of the Rohsenow correlation has been proposed which takes into account the influence of the grain size of the surface metal for predicting boiling heat transfer.