Department of Mechanical Engineering Final Exam Date: 25/01/2009 Convection Heat Transfer MEP 630 Time Allowed: 2.5 HOURS Instructions to Students

The components of a vertical circuit board, 150 mm on a side, dissipate 5 W. The back surface is well insulated and the front surface is exposed to quiescent air at 27 ⁰C.Assuming a uniform surface heat flux, what is the maximum temperature of the board?What is the temperature of the board for an isothermal surface condition?