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Performance of shrouded pin-fin and plate-fin heat sinks with a concentrated heat source

In order to investigate the heat transfer of different types of heat sinks under non-uniform heating condition, both plate-fin heat sinks and pin-fin heat sinks were tested with a square heat source having length of 45 mm, 10 mm and 4 mm at various frontal air velocities in this study. The results showed that heat sinks with larger heater size yielded higher heat transfer coefficient for both heat sinks. Besides, the increase of heat transfer coefficient was more rapid for heat sink with a larger heater size as the frontal velocity increased.