# Exam1_S08 - Name: ME 315: Heat and Mass Transfer Spring...

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Name: 1 ME 315: Heat and Mass Transfer Spring 2008 EXAM 1 Wednesday, 13 February 2008 7:00 to 8:00 PM Instructions: This is an open-book exam . You may refer to your course textbook, your class notes and your graded homework assignments. Show all work clearly for maximum credit. CIRCLE ALL ANSWERS . Problem Score 1 / 20 2 / 20 3 / 20 Total / 60

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Name: 2 q” t 1. (20 points) During an annealing process, a defect has been detected in a steel slab (approximated as a plane wall) of thickness L. Once the slab exits the furnace, it is to be set aside to cool before being reworked. When the slab exits the furnace, it is at a uniform temperature of T i = 1000°C and the air and surroundings are at a temperature of T = T surr = 30°C providing a convection coefficient of 40 W/m 2 K. The hot slab is placed such that the lower surface of the slab may be considered insulated. h, T T surr L x a. (4 pts.) Sketch the heat flux as a function of time, q”(t), at the top surface of the slab, x = L, using the axes given below.
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## This note was uploaded on 02/09/2012 for the course ME 352 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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Exam1_S08 - Name: ME 315: Heat and Mass Transfer Spring...

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