Abstract
Geometry and orientation plays an important role in natural convection heat transfer. In this paper experimental study of heat transfer from horizontal rectangular fins with fine and coarse perforations under natural convection is presented. The parameters varied for the experiment are heater inputs (Q= 52W, 61W and 73 W), fin spacing (S = 4-14 mm). The other parameters like fin length, fin height and width of array kept constant. The measurement of convective heat transfer is very critical and depends on estimation of average heat transfer coefficient (ha ). The experimentation results are presented in terms of various heat transfer parameters such as average heat transfer coefficient (ha), base heat transfer coefficient (hb). The comparison of these parameters is presented between finely perforated fins and coarsely perforated fins. It is observed that there is a significant effect of Fine perforation over coarse perforation with variation in fin spacing on average and base heat transfer coefficients. For natural convection the combination of finely perforated constant pitch
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