THERMAL SCIENCE

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Bulent Kozanoglu

,

Francisco Rubio

THE CHARACTERISTIC LENGTH ON NATURAL CONVECTION FROM A HORIZONTAL HEATED PLATE FACING DOWNWARDS

ABSTRACT
Natural convection from a downward facing horizontal heated plate was analyzed. An expression for the thickness of the thermal boundary layer was obtained in terms of Rayleigh number. Assuming this thickness as the characteristic length of the problem, the data published by other authors were modified and an equation for Nusselt number is presented. It was observed that this equation correlates the data more precisely than the commonly known equations in the literature that employ the ratio of the area to the perimeter or the shorter side of the plate as the characteristic length. It is concluded that taking the thermal boundary layer as the characteristic length of phenomenon is a proper approach and correlates all the data closely.
KEYWORDS
natural convection, thermal boundary layer, characteristic length, horizontal plate, downward facing surface
PAPER SUBMITTED: 2011-01-27
PAPER REVISED: 2013-06-15
PAPER ACCEPTED: 2013-06-15
PUBLISHED ONLINE: 2013-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI110127087K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Issue 2, PAGES [555 - 561]
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The characteristic length on natural convection from a horizontal heated plate facing downwards

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