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Q3/ A 1-mm-diameter wire is maintained at a temperature of 40°C and exposed to a convection environment at 40°C with h=120 W/m²°C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.2 mm to produce a critical radius. How much of this insulation must be added to reduce the heat transfer by 75 percent from that which would be experienced by the bare wire?

Name: q3 a ll mm diameter wire is maintained at a temperature of 40 c and exposed t a convection environment at 40 with h 120 wm ccalculate the thermal conductivity that will just cause an insulat 43773
Uploaded: 2022-06-22T18:51:40-08:00
Duration: 1 min 51 s
Channel: Adriano Chikande
Description: q3 a ll mm diameter wire is maintained at a temperature of 40 c and exposed t a convection environment at 40 with h 120 wm ccalculate the thermal conductivity that will just cause an insulat 43773

          Q3/ A 1-mm-diameter wire is maintained at a temperature of 40°C and exposed to a convection environment at 40°C with h=120 W/m²°C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.2 mm to produce a critical radius. How much of this insulation must be added to reduce the heat transfer by 75 percent from that which would be experienced by the bare wire?

Added by Jaime G.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Adriano Chikande

06/22/2022

Step 1

5 + 0.2 = 0.7 mm = 0.7 x 10^-3 m, h = 120 W/m^2°C k = rc * h k = 0.7 x 10^-3 * 120 k = 0.084 W/m°C Show more…

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Q3/ A 1-mm-diameter wire is maintained at a temperature of 40°C and exposed to a convection environment at 40°C with h=120 W/m²°C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.2 mm to produce a critical radius. How much of this insulation must be added to reduce the heat transfer by 75 percent from that which would be experienced by the bare wire?