Aca Problem #4 v=/ тр. TOTAL: 25 points) T.-25°C Inated hip DI Circular pin fins of diameter De 1 mm and length L = 25 -

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Aca Problem #4 v=/ тр. TOTAL: 25 points) T.-25°C Inated hip DI Circular pin fins of diameter De 1 mm and length L = 25 - 100 W/m'-* mm are used to enhance heat transfer from a surface that is maintained at T. - 100°C. One end of the finis attached to the surface (at x0), while the other end (x 25 mm) T-1000 can be considered as insulated Air flowing between the L-25 mm surfaces (and over the fins) is also at a temperature of T. = 25°C, and a uniform convection coefficient, h = 100 W/m2K is maintained over the entire fin surface. The finis made of Aluminum having thermal condue wity, k = 170 W/m... Calculate the following: (a) The fin parameter, m [3 marks) (b) The fin efficiency, 1 (4 marks) (c) Determine the fin heat transfer rate. 15 marks) (d) The fin effectiveness, 1m 15 marks) (e) The total rate of heat transfer from a 10 cm by 10 cm section of the surface having total number of ns, N25 x 25.625 at 100°C [8 marks)