Question

Consider a rectangular fin (k = 180 W/m-K) of length L =10 mm, thickness i =1 mm, and width w» t. The base temperature of the finis Ty = 150°C, and the finis exposed to a fluid of temperature T, =25°C. Assuming a uniform convection coefficient of h = 110 W/m2.K over the entire fin surface, determine the fin heat transfer rate per unit width 4; efficiency ng: effectiveness es, thermal resistance per unit width and the tip temperature T (L) for convection heat transfer at the tip, adiabatic tip and infinite fin. Step 1: Convective Tip Your answer is correct. Find the heat transfer per unit width, in W/m, for a convective tip. 4.com 276.442 W/m Attempts: 2 of 3 used Step 2: Convective Tip Your answer is incorrect. What is the effectiveness of the fin? el.cony = Save for Later Attempts: 2 of 3 used Submit Answer

Answer 1

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hallow/mak 700rroc I t=1mm 9 with fin 2 man - hP KA 1104 2.002 ..180 x 103. Now, L-tommy a= Sheka (T-700) danh mL o A = 1x1x10 -3 = 10-3 m2 theffectivenen ce Perimetr =p 2 ( W x 1 ) [1+ (1x103) € 2.002 m 9 without fin Pw/o fin = h Acg (T- Too) man=34.9727 ml 110X100(150-25) width is Im. 13.75 W/m Now, anumed when fin with ends are imulated. 6= 275,78 13,75 "Sa Phlox2.002 X 180x1003) x (150-25) €=20,056 x tan h (34.9977410X 10') Anun Q = 275.78 W/m Amur