Heat Transfer Increase With Thin Fins In
Three Dimensional Enclosures
Author(s)
R. L. Frederick & S. Samper
Abstract
Heat transfer enhancement with highly conductive, thin vertical fins attached to
the hot wall of a differentially heated cubical enclosure is numerically
investigated. Two such fins attached to the hot wall were found to promote heat
transfer enhancements of over 40% with respect to the unfinned case at Ra = 105
-107. This is one of the highest enhancements found to date in cavities of low
aspect ratio. At a Rayleigh number of 108, enhancements were lower, suggesting
that this Rayleigh number marks the upper utilization limit of fins in enclosures
to promote heat transfer. Results show that for further heat transfer optimization,
sensitivity to variables as the fin thickness and length should be studied.
Keywords: natural convection, differentially heated cavities, fins.
1 Introduction
Although heat transfer in differentially heated cavities with fins on the active
walls has been extensively studied, very few works have considered the three
dimensional problem of a cubical cavity with vertical fins added to the hot wall.
The extensive literature on the heat transfer effect of horizontal fins attached to
one of the vertical active walls of rectangular enclosures [1-8] can be briefly
summarized as follows: In low aspect ratio cavities, fins cause heat transfer
reductions relative to the unfinned cavity at the same Rayleigh number if their
thermal conductivity is low, while as thermal conductivity increases, fins cause
moderate enhancements.
Keywords
natural convection, differentially heated cavities, fins
Related Book
Other papers in this volume
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