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

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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
Transcribed Image Text: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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