Abstract
The significance of the heat transfer by natural convection in enclosures can be found in many engineering applications such as energy transfer in buildings, solar collectors, nuclear reactors, and electronic packaging. An experimental study was conducted to investigate the heat transfer by natural convection in a rectangular fin plate by circular perforations heat sinks. The patterns of perforations including 24 circular perforations (holes) for the first fin and the number of perforations increased 8 for every fin until reached to 56 in the fifth fins. These perforations were distribution on 6-14 columns and 4 rows. Experiments were carried through in an experimental facility that was specifically design and constructed for this purpose. It was observed that the temperatures along the non-perforated fin are drop from 30 to 250C but the temperature drop for perforated was from 30 to 23.70C with low power (6W), also the temperature drop between the fin base and tip increases as the perforation diameter increased. The temperature drop with high power (220W) was from 250 to 490C for non-perforared fin, but for perforated fins was from 250 to 360C. The heat transfer rate and the coefficient of heat transfer increases with increased number of perforation.
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