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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Effect of Fin Orientation and Length on the Rayleigh-Benard Convection
Author(s)
E. Evren Selamet, A. Selamet and R. Dehner
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DOI:10.17265/1934-8975/2017.05.005
Affiliation(s)
Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus OH 43210, USA
ABSTRACT
Natural convection
driven by the temperature difference of horizontal top and bottom surfaces of an enclosure
containing air, Pr
= 0.7, and fins of different arrangements at different lengths is studied numerically
for Ra = 105 and 5 ×
105. Evolution of heat transfer
rates (Nusselt number) is illustrated along with various, steady or unsteady, cellular
flow structures and temperature patterns. The effect of fin length and placement
on flow regime and heat transfer is established.
Different fin orientations at the walls are observed to
introduce considerable unsteadiness in some cases, requiring close investigation
in order to design systems for specific purposes.
KEYWORDS
Rayleigh-Benard convection, fin, instability.
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