It is proposed to coat a 1mm diameter wire with enamel paint ( k = 0.1 W/mK) to increase heat transfer with air. If the air side heat transfer co-efficient is 100 W/m2K, the optimal thickness of the enamel paint should be

It is proposed to coat a 1mm diameter wire with enamel paint ( k = 0.1

1.	It is proposed to coat a 1mm diameter wire with enamel paint ( k = 0.1 W/mK) to increase heat transfer with air. If the air side heat transfer co-efficient is 100 W/m2K, the optimal thickness of the enamel paint should be
A.	0.25 mm
B.	0.5 mm
C.	1 mm
D.	2 mm
Answer» C. 1 mm

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It is proposed to coat a 1mm diameter wire with enamel paint ( k = 0.1 W/mK) to increase heat transfer with air. If the air side heat transfer co-efficient is 100 W/m2K, the optimal thickness of the enamel paint should be

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