4 - CHE 378: Heat and Mass Transfer Spring 2008 Homework 4...

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CHE 378: Heat and Mass Transfer Spring 2008 Homework 4 Due: Friday, February 8, 2008 at the beginning of lecture 1. A rear window defroster in an automobile consists of uniformly distributed high- resistance wires molded into the glass. When power is applied to the wires, uniform heat generation may be assumed to occur within the window. During operation, heat that is generated is transferred by convection from both the interior and exterior surfaces of the window. However, due to the effects of vehicle speed and atmospheric winds, the convection coefficient of the warmer, interior side h i is less than that on the exterior side h o . On the same coordinate system, sketch the stead- state temperature distributions that would exist in the glass before the defroster has been turned on and after the defroster has been on for some time. 2. A long cylindrical rod of diameter 200 mm with thermal conductivity of 0.5 W/(m*K) experiences uniform volumetric heat generation of 24,000 W/m 3 . The rod
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This note was uploaded on 02/12/2010 for the course CHE 378 taught by Professor Wang during the Spring '10 term at Purdue.

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4 - CHE 378: Heat and Mass Transfer Spring 2008 Homework 4...

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