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Correlations and optimization of a heat exchanger with offset-strip fins

Title
Correlations and optimization of a heat exchanger with offset-strip fins
Author
육세진
Keywords
Offset-strip fins; Correlation; j Factor; f Factor; Prandtl number; Blockage ratio; Optimization
Issue Date
2011-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,권: 54 호: 9-10 페이지: 2073-2079
Abstract
The thermo-flow characteristics of a heat exchanger with offset-strip fins are numerically investigated for various fin geometries and working fluids. Previous correlations underestimate f values in the laminar and turbulent regimes and overestimate j values in the laminar regime, as the blockage ratio increase. Therefore, new correlations, which apply to offset-strip fins with blockage ratios of greater than 20%, are presented. Even though the working fluid was changed, the f values did not vary. However, the j values differed according to the working fluid. New j correlations were suggested as functions of the Prandtl number. Design variables of the offset-strip fins in a fuel cooler were optimized by using the correlations and the design of experiment. As a result, the JF factor of the optimized offset-strip fin was enhanced by 24% compared with that of the reference offset-strip fin. (C) 2011 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0017931010007143?via%3Dihubhttp://hdl.handle.net/20.500.11754/66457
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2010.11.056
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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