Question
Estimate the heat transfer from a 40 W incandescent bulb at 125 degree Celsius to 25 degree Celsius in quiescent air. Approximate the bulb as a 50 mm diameter sphere. The approximate correlation for the convection coefficient is
Nu = 0.60 (Gr Pr)^ 0.25
Where the different parameters are evaluated at the mean film temperature, and characteristics length is the diameter of the sphere.
Nu = 0.60 (Gr Pr)^ 0.25
Where the different parameters are evaluated at the mean film temperature, and characteristics length is the diameter of the sphere.
Answer: Option D
Answer: (d).7.71 W
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Answer: (d).7.71 W
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