NCSU MAE310 H OMEWORK #12 Provide a clear concise solution for the proceeding convective heat transfer problems. 1. To enhance heat transfer from a silicon chip of width W=4 mm on a side, a copper pin fin is brazed to the surface of the chip. The pin length and diameter are L=12 mm and D=2 mm, respectively, and atmospheric air at V=10 m/s and T ∞ =300 K is in cross flow over the pin. The surface of the chip, and hence the base of the pin, are maintained at T b =350 K. (a)Assuming the chip to have a negligible effect on flow over the pin, what is the average convection coefficient for the surface of the pin? (b) Neglecting radiation and assuming the convection coefficient at the pin tip to equal that calculated in part (a), determine the pin heat transfer rate. (c) Neglecting radiation and assuming the convection coefficient at the exposed chip surface to equal that calculated in part (a), determine the total rate of heat transfer from the chip. 2.
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This note was uploaded on 08/01/2008 for the course MAE 310 taught by Professor Kuznetsov during the Fall '08 term at N.C. State.