06 (Variable Area, Radial Conduction)

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Unformatted text preview: k= W/(m K), L=4mm), T1= 15°C Find: q’’ for the heater to maintain T1 = 15°C Assume: Given: Thin transparent film-type heater Analyze: EXAMPLE 2: RADIAL A thin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. The rod A has a thermal conductivity of kA= 0.15 W /(m K), while the tube B has a thermal conductivity of kB=1.5 W/(m K) and its outer surface is subjected to heat convection with a fluid of temperature T∞ = -15 C and heat transfer coefficient of 5...
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This document was uploaded on 01/15/2014.

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