An Experimental Study on the Influence of Forced Vibration on Longitudinal Fins Heat Sink Subjected to Free Convection Heat Transfer

The research includes a practical study to demonstrate the influence of vertical forced vibration in the free convection heat transfer coefficient of a long-fined sheet made of Aluminium and compare the results with a flat plate. The plate is heated by constant heat flux upwards ranging between (300-1750W/m2) and the tilt angles ranged from (25°,45o and 90°). The test model contains (12) rows of fins, dimensions of each fin (300mm length), (12 mm height) and (3mm thickness). The effect of frequency (f) was studied for ranges (0, 3, 7, 12 and 16 Hz) and the vibration amplitude (a) ranged from (1.51-8.4 mm). The results showed that the relationship between the rate of free heat transfer and the vibration amplitude is proportional with the tilt angles. It was also found that the heat transfer coefficient of free convection decreases with the increases of tilt angle, where its value at the angle (25°) was greater by (14.36%) than those for the (45o) and higher than the angle (90°) by (26.71%).