ME410_HW1_2010

# ME410_HW1_2010 - (W/m 2 ). (5pts) 3. A fluid flows at 15 °...

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ME 410-2 Name:_______________________________ Homework #1 (due August 30, 2010) Homework Format 1. Use this page as a cover sheet. 2. One problem per page. 3. Always state what is given, your assumptions, provide a sketch, and analysis. Circle your answer. Include units. 4. Write legibly. 5. No late homework accepted. 6. Work independently. 7. Use paper with four straight edges. 8. Staple together your work. 1. Solve the following differential equations subject to the specified boundary conditions (5pts each): a) ) 1 ( 2 ) 1 ( and ) 0 ( 3 ) 0 ( to subject , 0 2 2 y y y y dx y d = = = b) 1 ) 2 ( and ) 1 ( ) 1 ( to subject , 0 = = = y y y dx dy x dx d c) 1 at 0 and 1 ) 0 ( to subject , 5 . 0 2 2 = = = = x dx du u x u dx u d 2. A temperature difference of 35 ° C is impressed across a fiberglass layer of 10 cm thickness. The thermal conductivity of the fiberglass is 0.045 W/(m K). Determine the heat flux through the material
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Unformatted text preview: (W/m 2 ). (5pts) 3. A fluid flows at 15 ° C flows over a 3-cm-OD and 2-m long tube, whose surface is maintained at 100 ° C. If the heat transfer coefficient between the tube and the air is 250 W/(m 2 K), determine the rate of convective heat transfer from the tube to the air. If the outer surface of the tube has an emissivity of 0.9, and if it sees the surroundings at a temperature of 15 ° C, what is the net radiative heat transfer? (5pts) 4. A small radiant heater has 25 metal strips, each 6 mm wide and a length of 3 m. The surface emissivity of the strips is 0.85. To what temperature must the strips be heated if they are to dissipate 1600 W of heat to a room at 25 ° C? Assume the strips dissipate heat from one side only. (5pts)...
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## This document was uploaded on 02/10/2011.

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