Air at 20°C enters a heated circular tube with a diameter of 30 mm and a length of 3 m. The mass flow rate is 0.005 kg/s and the flow is fully developed with h = 25 W/m². 20°C 0.005 kg/s q" If the tube is heated by uniform surface heat flux of 1000 W/m², calculate the surface temperature at the outlet (Ts.o) in °C =

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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.27P
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Air at 20°C enters a heated circular tube with a diameter of 30 mm and a length of 3 m. The mass flow rate is 0.005 kg/s and the flow is
fully developed with h = 25 W/m².
20°C
0.005 kg/s
q"
If the tube is heated by uniform surface heat flux of 1000 W/m2, calculate the surface temperature at the outlet (Ts.o) in °C =
If the surface heat flux varies linearly in the flow direction as 600x W/m2, (x is in meters and equals to 0 at the inlet and equals to 3 at the
outlet) calculate the mean temperature at the outlet (Tm,o) in °C =
105
116
128 || 138
145 || 152
167
60.0
70.4
80.5
90.1
100.7 || 110.2| 120.1
Transcribed Image Text:Air at 20°C enters a heated circular tube with a diameter of 30 mm and a length of 3 m. The mass flow rate is 0.005 kg/s and the flow is fully developed with h = 25 W/m². 20°C 0.005 kg/s q" If the tube is heated by uniform surface heat flux of 1000 W/m2, calculate the surface temperature at the outlet (Ts.o) in °C = If the surface heat flux varies linearly in the flow direction as 600x W/m2, (x is in meters and equals to 0 at the inlet and equals to 3 at the outlet) calculate the mean temperature at the outlet (Tm,o) in °C = 105 116 128 || 138 145 || 152 167 60.0 70.4 80.5 90.1 100.7 || 110.2| 120.1
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