Electric current of 150 A is carried through a 5 mm diameter cylindrical wire which has a resistance of 0.003 ohm per meter length.The wire is exposed to a cross flow of air at 22°C and its surface temperature is measured as 30°C. In your calculations, take airproperties at 300 K and use the following correlation and constants:RepCm0.4-40.9890.330hDNup =k4-400.9110.385C Re, PH%3D%3D40–40000.6830.4664000 – 40,0000.1930.61840,000– 400,0000.0270.805Calculate the average heat transfer coefficient in W/m2KCalculate the air velocity in m/s

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Calculate the average heat transfer coefficient in W/m2K Calculate the air velocity in m/s

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.4P: An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a...

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Question

Electric current of 150 A is carried through a 5 mm diameter cylindrical wire which has a resistance of 0.003 ohm per meter length.
The wire is exposed to a cross flow of air at 22°C and its surface temperature is measured as 30°C. In your calculations, take air
properties at 300 K and use the following correlation and constants:
Rep
C
m
0.4-4
0.989
0.330
hD
Nup =
k
4-40
0.911
0.385
C Re, PH
%3D
%3D
40–4000
0.683
0.466
4000 – 40,000
0.193
0.618
40,000– 400,000
0.027
0.805
Calculate the average heat transfer coefficient in W/m2K
Calculate the air velocity in m/s

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