One meter long nichrome wire of resistivity 1.2 µQm is to dissipate 12 kW heat in the surrounding fluid which is at 82°C. Find the diameter of the wire if the maximum operating temperature of the wire is 980°C. K for wire is 62 W/mK and h = 1.32 kW/m2 K.

One meter long nichrome wire of resistivity 1.2 µQm is to dissipate 12 kW heat in the surrounding fluid which is at 82°C. Find the diameter of the wire if the maximum operating temperature of the wire is 980°C. K for wire is 62 W/mK and h = 1.32 kW/m2 K.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.33P

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Question

One meter long nichrome wire of resistivity
1.2 µQm is to dissipate 12 kW heat in the
surrounding fluid which is at 82°C. Find the
diameter of the wire if the maximum operating
temperature of the wire is 980°C. K for wire is
62 W/mK and h = 1.32 kW/m? K.

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