Resonant enhancement of natural convection heat transfer in a square enclosure

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A numerical investigation is made of natural convection of an incompressible fluid in a square cavity having a constant-temperature cold sidewall and an opposite hot sidewall with sinusoidally-varying temperature. Comprehensive numerical solutions to the Navier-Stokes equations are acquired for a fixed Rayleigh number and a Prandtl number, Ra = 10(7) and Pr = 0.7. The amplitude and frequency of the hot wall temperature oscillation are varied. The lime-mean heat transfer in the interior as well as the amplifications of fluctuations of instantaneous heat transfer are analyzed. The results disclose that a large-amplitude wall temperature oscillation causes an augmentation of the time-mean heat transfer rate. The maximum gain of the time-mean Nusselt number in the interior occurs at the resonance frequency, at which maximal fluctuations of the Nusselt number are found. The mechanism for resonant enhancement of the time-mean heat transfer is described. (C) 1998 Elsevier Science Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
1998-09
Language
English
Article Type
Article
Keywords

THERMAL-CONVECTION; WALL TEMPERATURE; VIBRATION; GRAVITY; LAMINAR; CAVITY; LAYER; SIDE

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.41, no.18, pp.2837 - 2846

ISSN
0017-9310
URI
http://hdl.handle.net/10203/77358
Appears in Collection
ME-Journal Papers(저널논문)
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