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http://dx.doi.org/10.5855/ENERGY.2011.20.3.242

The Effects of Top and Bottom Lids on the Natural Convection Heat Transfer inside Vertical Cylinders  

Kang, Gyeong-Uk (Department of Nuclear and Energy Engineering, Institute for Nuclear Science and Technology, Jeju National University)
Chung, Bum-Jin (Department of Nuclear and Energy Engineering, Institute for Nuclear Science and Technology, Jeju National University)
Publication Information
Journal of Energy Engineering / v.20, no.3, 2011 , pp. 242-251 More about this Journal
Abstract
The effects of top and bottom lids on the natural convection heat transfer phenomena inside vertical cylinders were investigated experimentally for $Ra_{Lw}$ from $9.26{\times}10^9$ to $7.74{\times}10^{12}$. Using the concept of analogy between heat and mass transfer, a cupric acid-copper sulfate electroplating system was employed as mass transfer experiments replacing heat transfer experiments. The natural convection heat transfer of both-open cylinders in laminar and turbulent flows was in good agreement with the existing heat transfer correlations developed for vertical plates. The effects of top and bottom lids on the heat transfer rates were very similar to the studies of Krysa et al. and Sedahmed et al. and Chung et al. With the copper lids, the bottom-closed cavity showed the highest heat transfer rates and then followed both-closed, top-closed, both-open ones in both laminar and turbulent flows. However with the acryl lids, the similar trends were observed except that the heat transfer rates for both-open were higher than top-closed one. The use of the copper lids increased the heat transfer rates compared to the acryl lids due to the hydrodynamic interaction of the flows developed for the different heated faces. This study extended the ranges of flow conditions of the existing literatures and proposed the empirical correlations.
Keywords
Natural Convection; Heat Transfer; Mass Transfer; Vertical Cylinder; Analogy; Electroplating system;
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Times Cited By KSCI : 3  (Citation Analysis)
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