Experiments on heat transfer enhancement from a heated square cylinder in a pulsating channel flow

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Experiments have been performed to investigate heat transfer enhancement from a heated square cylinder in a channel by pulsating flow. For all the experiments, the amplitude of the pulsating flow is fixed at A = 0.05. The effects of the Reynolds number based on the mean flow velocity (Re = 350 and 540), the pulsating frequency (0 Hz < f(p) < 60 Hz) and the blockage ratio of the square cylinder (beta = 1/10, 1/8, and 1/6) on convective heat transfer are examined. The measured Strouhal numbers of shedding vortices for non-pulsating (A = 0) steady inlet flow are compared with the previously published data, and good agreement is found. The "lock-on" phenomenon is clearly observed for a square cylinder in the present flow pulsation. When the pulsating frequency is within the lock-on regime, heat transfer from the square cylinder is substantially enhanced. In addition.. the influence of the Reynolds number and the blockage ratio on the lock-on occurrence is discussed in detail. (C) 2007 Published by Elsevier Ltd.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2008-03
Language
English
Article Type
Article
Keywords

CIRCULAR-CYLINDER; LOCK-ON; RECTANGULAR CYLINDERS; NUMERICAL PREDICTION; OSCILLATING CYLINDER; UNIFORM-FLOW; CROSS-FLOW; VORTEX; WAKES; BODY

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.51, no.5-6, pp.1130 - 1138

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2007.04.015
URI
http://hdl.handle.net/10203/92536
Appears in Collection
ME-Journal Papers(저널논문)
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