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Unformatted text preview: . What is the allowable power dissipation from the top surface of the assembly of IC chips if the average surface temperature of the IC chips must not exceed the ambient temperature by more than 25 o C? Evaluate the properties of air at a film temperature of 300 K. (You need to apply the Chilton-Colburn Analogy, Sec. 6.7.3) 3. A 100 W light bulb may be modeled as a cylinder 80 mm in diameter and 100 mm in height. (yeah, I know, it's a poor model) The room air blows across the bulb at 1.5 m/s and 27 o C. Ignore the top and bottom surfaces of the model of the bulb. (a) Assuming that all of the heat transfer occurs through convection, find the approximate surface temperature of the bulb (T s ). 4. Engine oil initially at 47 o C enters a drilled passage 5 mm diameter x 100 mm long in an engine block that is at 177 o C. The velocity of the oil is 0.1 m/s. Use 330 K for the properties of the oil. What is the outlet temperature of the oil?...
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This note was uploaded on 05/02/2011 for the course MAE 412 taught by Professor Terry during the Spring '08 term at N.C. State.
- Spring '08
- Heat Transfer