Air at 27C with a free stream velocity of 10 m/sis used to
Chapter 7, Problem 7.36(choose chapter or problem)
Air at 27?C with a free stream velocity of 10 m/sis used to cool electronic devices mounted on aprinted circuit board. Each device, 4 mm4 mm,dissipates 40 mW, which is removed from the topsurface. A turbulator is located at the leadingedge of the board, causing the boundary layer to beturbulent.(a) Estimate the surface temperature of the fourthdevice located 15 mm from the leading edge of theboard.(b) Generate a plot of the surface temperature of thefirst four devices as a function of the free streamvelocity for 5u?15 m/s.(c) What is the minimum free stream velocity if thesurface temperature of the hottest device is not toexceed 80?C?
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