GATE Mechanical Engineering (ME) 2019 Shift 1 Solved Paper
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Question : 60
Total: 65
The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrappinga heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. Thefluid is incompressible and the flow is assumed to be laminar and steady all through the pipe.The bulk temperature of the fluid is equal to 0oC at the inlet and 50oC at the exit. The walltemperatures are measured at three locations, P, Q and R as shown in the figure. The flowthermally develops after some distance from the inlet. The following measurements are made:
| Point | P | Q | R |
|---|---|---|---|
| Wall Temp °C | 50 | 80 | 90 |
Among the locations P, Q and R, the flow is thermally developed at
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