Question
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.
Find what percent of power is lost by free convection?
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.
Find what percent of power is lost by free convection?
Answer: Option C
Answer: (c).19.278%
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Answer: (c).19.278%
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