A flat aluminum plate 8 m long and 1.5 m wide has a surface temperature of 180°C. For its cooling, air at 1 atm and speed of 10 m/s circulates at 20°C parallel to the length of the plate. a) Determine the rate of heat transfer by convection in steady state.
A flat aluminum plate 8 m long and 1.5 m wide has a surface temperature of 180°C. For its cooling, air at 1 atm and speed of 10 m/s circulates at 20°C parallel to the length of the plate.
a) Determine the rate of heat transfer by convection in steady state.
b) In order to increase the heat dissipation from the plate, the engineers considered placing rectangular fins of the same material (Kaluminium = 200 W/m.K). The fins are 50 mm long and 0.5 mm thick and the placement density is 75 fins per unit length of the plate (the fins are equally spaced and span the entire width of the plate). The convective coefficient of the air over the plate resulting from the placement of fins is 10 W/m².K. Determine the heat transfer rate and percentage increase over part (a).
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