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Experimental Investigation of Convection Heat Transfer in Mini-Fin Structures and Sintered Porous Media
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ABSTRACT
Forced convection heat transfer of air and water in bronze and pure copper mini-fin structures and a sintered bronze porous media were investigated experimentally. The mini-fin dimensions were 0.7 mm × 0.2 mm, 0.8 mm × 0.2 mm, 0.8 mm × 0.4 mm, and 0.8 mm × 0.8 mm. The diameters of the sintered porous media were 0.5—0.71 mm. The tests investigated the effects of fluid velocity, mini-fin dimensions and materials, and fluid properties on the convection heat transfer and heat transfer enhancement. The results showed that the mini-fin structures greatly increased the heat transfer coefficient. For the tested conditions the convection heat transfer coefficient was increased 10-24 fold for water and 16-40 fold for air in the mini-fin structures, compared with an empty plate channel. The friction factor and flow resistance in the mini-fin structure with higher porosity were much less than in the other mini-fin structures and in the sintered porous media. The heat transfer coefficients in the mini-fin structure were larger than in the sintered porous plate channel with the same porosity and material and similar dimensions. The mini-fin structure with Ww = 0.8 mm and Wc = 0.4 mm had the best overall thermal/hydraulic performance.
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