Warm air is blown over the inner surface of an automobile windshield to defrost ice accumulated on the outer surface of the windshield. Consider an automobile windshield (kw 5 0.8 Btu/h. ft. R) with an overall height of 20 in and thickness of 0.2 in. The outside air (1 atm) ambient temperature is 88F and the average airflow velocity over the outer windshield surface is 50 mph, while the ambient temperature inside the automobile is 778F. Determine the value of the convection heat transfer coefficient for the warm air blowing over the inner surface of the windshield, necessary to cause the accumulated ice to begin melting. Assume the windshield surface can be treated as a flat plate surface.

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