Forced air at 25C and 10 m/s is used to cool electronic elements mounted on a circuit

Forced air at 25°C and 10 m/s is used to cool electronic elements mounted on a circuit board. Consider a chip of length 4 mm and width 4 mm located 120 mm from the leading edge. Because the board surface is irregular, the flow is disturbed and the appropriate convection correlation is of the form Nux = 0.04Rex0.85 Pr0.33.

Estimate the surface temperature of the chip, Ts, if its heat dissipation rate is 30 mW.

Transcribed Image Text:

Air 4 mm Chip Board X = 120 mm