EML4147C Test 1 Spring 2009

# EML4147C Test 1 Spring 2009 - EML 4147C Test 1 Spring 2009...

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EML 4147C Test 1 Spring 2009 Name_______________________ Page 1 of 10 Each question worth 10 points. 1a) What is the resistance R w due to conduction through the wall of the inner pipe? a) 4.3 x 10 -3 K/W b) 7.1 x 10 -4 K/W c) 5.9 x 10 -4 K/W d) 6.7 x 10 -7 K/W e) 8.9 x 10 -4 K/W f) 2.8 x 10 -2 K/W 1b) What is the Reynolds number of the flow in the inner pipe? a) 44,000 b) 43,600 c) 6620 d) 9990 e) 11,340 f) 21,600 1c) What is the heat transfer coefficient h c of the flow in the inner pipe? a) 1883 W/(m 2 ·K) b) 2567 W/(m 2 ·K) c) 3844 W/(m 2 ·K) d) 4590 W/(m 2 ·K) e) 5649 W/(m 2 ·K) f) 6128 W/(m 2 ·K) 1d) What is the area of the fins? a) 0.06 m 2 b) 0.12 m 2 c) 0.18 m 2 d) 0.24 m 2 e) 0.36 m 2 f) 0.48 m 2 1e) What is the fin efficiency η f ? a) 0.089 b) 0.911 c) 0.322 d) 0.924 e) 0.663 f) 0.891 1f) What is the overall surface efficiency o of the finned area? a) 0.931 b) 0.916 c) 0.941 d) 0.653 e) 0.589 f) 0.435 1g) What is the product of the overall heat transfer coefficient and the area of the inner pipe (UA) c ? a) 10.1 W/K b) 15.6 W/K c) 23.6 W/K d) 25.3 W/K e) 26.5 W/K f) 45.3 W/K 1h) What is the heat transfer rate for a 1-meter length of the pipe? a) 3410 W b) 4360 W c) 5520 W d) 7590 W e) 10,590 W f) 11,800 W 2a) If the annular gap is d = 10 mm and the heat exchanger length is L = 1 m, what is the Reynolds number of the cold flow in the annulus?

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## This note was uploaded on 09/15/2011 for the course EML 4147C taught by Professor Abbitt during the Spring '11 term at University of Florida.

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EML4147C Test 1 Spring 2009 - EML 4147C Test 1 Spring 2009...

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