An aluminum block is cast with an array of pin fins protruding like that shown in Figure 2 10d and subjected to room air at 20C The convection coefficient between the pins and the surrounding air may be assumed to be h 13 2 W m2 C The pin diameters are 2 mm and their length is 25 mm The base of the...

k 204 20 o C T 0 70C L 25 mm h 132 d 2 mm ...

An aluminum block is cast with an array of pin fins protruding like that shown in Figure

Question:

An aluminum block is cast with an array of pin fins protruding like that shown in Figure 2-10d and subjected to room air at 20ºC. The convection coefficient between the pins and the surrounding air may be assumed to be h = 13.2 W/m2 ∙ ºC. The pin diameters are 2 mm and their length is 25 mm. The base of the aluminum block may be assumed constant at 70ºC. Calculate the total heat lost by an array of 15 by 15, that is, 225 fins.