A D 5 mm diameter electrical transmission line carries an electric current of I= 50 A and has a resistance of R =0.002 ohm per meter length. Determine the surface temperature of the wire during a windy day when the air temperature is Tair-10° C and the wind is blowing across the transmission line at V-50 km/h. The empirical correlation of Nusselt number for flow across the cylinder is Nu = 0.9 Re04 Prº3. The properties of air are as follows: thermal conductivity k=0.03 W/m °C, kinematic viscosity v = 19x10-6 m²/s, Pr = 0.7. Wind, 50 km/h 260 10°C Transmission
A D 5 mm diameter electrical transmission line carries an electric current of I= 50 A and has a resistance of R =0.002 ohm per meter length. Determine the surface temperature of the wire during a windy day when the air temperature is Tair-10° C and the wind is blowing across the transmission line at V-50 km/h. The empirical correlation of Nusselt number for flow across the cylinder is Nu = 0.9 Re04 Prº3. The properties of air are as follows: thermal conductivity k=0.03 W/m °C, kinematic viscosity v = 19x10-6 m²/s, Pr = 0.7. Wind, 50 km/h 260 10°C Transmission
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:A D-5 mm diameter electrical transmission line carries an electric current of I = 50 A and has a resistance of R
=0.002 ohm per meter length. Determine the surface temperature of the wire during a windy day when the air
temperature is 10° C and the wind is blowing across the transmission line at V=50 km/h. The empirical
correlation of Nusselt number for flow across the cylinder is Nu = 0.9 Re04 Pr03. The properties of air are as
follows: thermal conductivity k =0.03 W/m °C, kinematic viscosity v = 19x10-6 m²/s, Pr=0.7.
Wind, 50 km/h
2222
2026132 314966
10°℃
Transmission
lines
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