Q8/ A 1.0mm diameter wire is maintained at a temperature of 400 C and 2 o exposed to a convection environment at 40°C. with h=20W/m. C. Calculate the thermal conductivity which will just cause an insulation thickness of 0.2mm to reduce a "critical radius". How much of this insulation must be added to reduce the heat transfer by 75% from that which would be experienced by the bare wire?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.59P
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Q8/ A 1.0mm diameter wire is maintained at a temperature of 400 C and
exposed to a convection environment at 40°C. with h=20W/m.C. Calculate
the thermal conductivity which will just cause an insulation thickness of 0.2mm
to reduce a "critical radius". How much of this insulation must be added to
reduce the heat transfer by 75% from that which would be experienced by the
bare wire?
Transcribed Image Text:Q8/ A 1.0mm diameter wire is maintained at a temperature of 400 C and exposed to a convection environment at 40°C. with h=20W/m.C. Calculate the thermal conductivity which will just cause an insulation thickness of 0.2mm to reduce a "critical radius". How much of this insulation must be added to reduce the heat transfer by 75% from that which would be experienced by the bare wire?
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