Air is flowing through a thick walled copper pipe that can be considered to be isothermal at 450 degrees C. Inner diameter of the pipe is 3cm and 0.9m long. Air enters at 30 degrees C and exit bulk temperature is 95 degrees C. if the length is now doubled assuming air mass flow rate and heat transfer coefficient remain the same in both lengths what is the new bulk temperature at the exit? a) 148.58°C b) 151°C c) 140.2°C d) 158.6°C

Elements Of Electromagnetics
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Air is flowing through a thick walled copper pipe that can be considered to be isothermal at 450 degrees C. Inner diameter of the pipe is 3cm and 0.9m long. Air enters at 30 degrees C and
exit bulk temperature is 95 degrees C. if the length is now doubled assuming air mass flow rate and heat transfer coefficient remain the same in both lengths what is the new bulk
temperature at the exit?
a)
148.58°C
b)
151°C
c)
140.2°C
d)
158.6°C
Transcribed Image Text:Air is flowing through a thick walled copper pipe that can be considered to be isothermal at 450 degrees C. Inner diameter of the pipe is 3cm and 0.9m long. Air enters at 30 degrees C and exit bulk temperature is 95 degrees C. if the length is now doubled assuming air mass flow rate and heat transfer coefficient remain the same in both lengths what is the new bulk temperature at the exit? a) 148.58°C b) 151°C c) 140.2°C d) 158.6°C
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