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Local heat transfer and heat flux distributions in finned tube heat exchangers
Author(s) -
Schüz Gerhard,
Kottke Volker
Publication year - 1992
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270150609
Subject(s) - fin , thermodynamics , heat transfer , heat flux , annular fin , mechanics , micro heat exchanger , heat transfer coefficient , materials science , ntu method , plate fin heat exchanger , heat exchanger , thermal conduction , dynamic scraped surface heat exchanger , critical heat flux , plate heat exchanger , physics , composite material
A detailed analysis of the effect of local heat transfer distributions, which were determined experimentally, on temperature distributions in the fins and in the fluid between two adjacent fins of finned tube heat exchangers is presented. The heat transfer distributions, obtained by a mass transfer technique, prove to be very inhomogeneous over the fin surface, leading to variable results for fin efficiency calculated by the conventional method. In addition, the effect of temperature variation in the fluid, which is usually neglected in fin analysis, is shown in many cases to exert a very strong influence on fin efficiency and total heat flux. For the optimization of fin designs, a combined analysis of local heat transfer, conduction resistance in the fin and temperature variation in the passage is indispensable.