Quiz 14 potential problems ChE 350 sp10

Quiz 14 potential problems ChE 350 sp10 - k =115 W/m K) 7.5...

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Sample question for ChE 350 Spring 2010 Quiz 14 Name:________________________ 1 1. A steel wire is stretched with a stress of 70 MPa at 20 o C. If the length is held constant, to what temperature must the wire be heated to reduce the stress to 17 MPa? [Consider the elastic modulus of steel to be temperature independent and equal to 207 GPa; the linear thermal expansion coefficient is C 10 12 o 6 × .] 2. (a) Calculate the heat flux through a sheet of brass (
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Unformatted text preview: k =115 W/m K) 7.5 mm thick if the temperature at the two faces are 150 and 50 o C; assume steady-state heat flow. (b) What is the heat loss per hour if soda-lime glass (( k =1.7 W/m K) instead of brass is used? 3. The heat capacity for an ideal crystalline solid is 3 R , where R is the gas constant. The heat capacity for Al is 900 J/kg K. What percentage deviation is this value from the ideal value of 3 R ?...
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