Question: 8 . 2 0 An electronic device is cooled by blowing 3 0 C air over it . The device can be modeled as a

8.20
An electronic device is cooled by blowing 30 C air over it. The device can be modeled as a sphere of 0.5 cm diameter. The power dissipated by the device is 5 W . What is the needed velocity of the air if the temperature of the outer surface of the device cannot exceed 200 C ? Assume that conductive and radiative heat transfers are negligible.
8 . 2 0 An electronic device is cooled by blowing

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