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Midterm-1 - ChE 303 Midterm 1-Fall 2011 When writing your...

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ChE 303- Midterm 1-Fall 2011 When writing your solutions, add occasional phrases or sentences to describe your thought process. This will help me assign partial credit. Total points=60. Problems 1 carries 25 points, problem 2 carries 15 points and problem 3 carries 20 points 1. In a manufacturing process, a transparent film is being bonded to a substrate as shown in the sketch. To cure this bond at a temperature T O, a source of radiation is kept at the interface between the film and substrate. This radiation source provides a constant heat flux of W/m 2 . The back of the substrate is maintained at temperature T 1 while the top surface of the film is exposed to air at temperature . The air has a convection heat transfer coefficient of h. a) Draw the thermal circuit representing the steady-state heat transfer situation. Be sure to label all the resistances and temperatures. (5 points) b) If W/m 2 and W/m 2 are the fluxes through film and substrate respectively. Use energy balance to write the relationship between
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