Discuss teh below:
Q: A copper wire, 1/32-in.-OD, 2 in. long, is placed in an air stream whose temperature rises at Tair = (50 + 25t)°F, where t is the time in seconds. If the initial temperature of the wire is 50°F, determine its temperature after 2 s, 10 s and 1 min. The heat transfer coefficient between the air and the wire is 7 Btu/(h ft2 °F).
GIVEN
A copper wire is placed in an air stream
Wire diameter (D) = 1/32 in.
Wire length (L) = 2 in.
Air stream temperature is: Tair = (50 + 25t)°F
The initial temperature of the wire (To) = 50°F
The heat transfer coefficient (hc ) = 7 Btu/(h ft2 °F)
ASSUMPTIONS
Constant and uniform heat transfercoefficient
