Question: D = 20cm 30C, 10m/s 2m Electronic components inside You are designing components of an electronic systems that needs to be inside a 2

D = 20cm 30C, 10m/s 2m Electronic components inside You are designing components of an electronic systems that needs to be inside a 2 m long horizontal duct. The components are sensitive so the cooling mechanism is only done by air flowing over the duct at 30C and 10 m/s. Initially you proposed a square cross-section with 20-cm length for the duct but is rejected by your client because they said a circular cross- section is better. If the surface temperature of the duct cannot exceed 60C, find the maximum power rating in kW of the electronics devices that can be located inside the circular cross-section duct. Is it true that circular cross-section is better than a square one for this application?

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