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Heat transfer in the critical region—temperature and velocity profiles in turbulent flow
Author(s) -
Wood Rodney D.,
Smith J. M.
Publication year - 1964
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.690100210
Subject(s) - turbulence , heat transfer , thermodynamics , flattening , tube (container) , critical point (mathematics) , thermal conductivity , mechanics , chemistry , materials science , physics , geometry , mathematics , composite material
Unusual heat transfer phenomena have been observed between solid surfaces and fluids near their thermodynamic critical point. To understand better these phenomena temperature and velocity profiles and local heat transfer coefficients were measured for turbulent flow of carbon dioxide in a tube at 1,075 lb/sq. in. abs. ( p c = 1,071). The results indicate a severe flattening of the radial temperature profiles, a maximum in the velocity profile between the wall and the tube axis, and a maximum in h ' when the bulk fluid temperature passes through the transposed critical temperature. The results can be explained qualitatively by considering the variation with temperature of thermal conductivity near the tube wall and specific heat in the turbulent core.