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An aluminum block is cast with an array of pin fins and subjected to room air at 20 C. The convection coefficient between the pins

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An aluminum block is cast with an array of pin fins and subjected to room air at 20 C. The convection coefficient between the pins and the surrounding air may be 25mm. The base of the aluminum block may be assumed constant at 70C. Calculate the total heat lost by an array of 15 by 15 , that is, 225 fins. (TB, Problem 2.89) [Ans: q=23.15W]

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