Effect of fin angles of attack on heat transfer and air pressure drop in a fin-and-tube heat exchanger
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Abstract
This research investigates the effect of the angle of attack between the air and the fins on the heat transfer and air pressure drop of a fin and tube heat exchanger. Four fin angles of attack (i.e., 0°, 5°, 10° and 15°) and three fin pitches (i.e., 7.5 mm, 10 mm and 15 mm) are tested. The working fluids for testing are the water and the air, the water at 80°C with constant flow rate is 5 l/min while the air at 30° C with various velocities from 2 m/s to 10 m/s flow through the heat exchanger. The results show that the heat transfer rate and air pressure drop of all fin pitches are mainly influenced by the angle of attack and air velocity. Heat transfer and air pressure drop increase with increasing the angle of attack and the air velocity. The 15° provides significantly higher heat transfer and pressure drop than the 0° of 38.44% and 299.68%, respectively. When considering the ratio between heat transfer to pressure drop or the heat exchanger performance, it is found that increasing of both the angle of attack and the air velocity were results decrease the heat exchanger performance. It was found that at the angle 0° provided 245.01% greater performance than the angle of 15°.
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