Enhanced heat transfer in channels with staggered fins of different spacings

The flow pattern and heat transfer across staggered fins inside a rectangular duct are presented. The influence of Reynolds number, fin spacing, fin material, and wall heat flux on local and average heat transfer coefficients are studied. Fin spacings ranged from 0.8 to 2.0 times the channel height....

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Bibliographic Details
Published in:The International journal of heat and fluid flow 1993-06, Vol.14 (2), p.185-190
Main Authors: Habib, M.A., Mobarak, A.M., Attya, A.M., Aly, A.Z.
Format: Article
Language:English
Subjects:
Applied sciences
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
flow
Heat exchangers (included heat transformers, condensers, cooling towers)
heat transfer
staggered fins
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Summary:The flow pattern and heat transfer across staggered fins inside a rectangular duct are presented. The influence of Reynolds number, fin spacing, fin material, and wall heat flux on local and average heat transfer coefficients are studied. Fin spacings ranged from 0.8 to 2.0 times the channel height. The fin height was 0.7 times the channel height. The investigated Reynolds number ranged from 8,000 to 18,000. The experimental results show that the flow must pass over three to six fins before it appears to be a thermally periodic, fully developed flow. The fins enhance the heat transfer significantly due to flow deflection and impingement upon the fins. Augmentation of heat transfer was obtained with increase in Reynolds number, thermal conductivity of fins, and decrease in fin spacing and wall heat flux.
ISSN:0142-727X
1879-2278
DOI:10.1016/0142-727X(93)90027-K