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The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid 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 0°C at the in let and 50°C at the exit. The wal l temperatures are measured at three locations, P, Q an d R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made :

Among the locations P, Q and R, the flow is thermally at :
[2019]
  • a)
    R only
  • b)
    P and Q only
  • c)
    P, Q and R
  • d)
    Q and R only
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The wall of a constant diameter pipe of length 1 m is heated uniformly...
In case of uniform heat flux, bulk mean temperature varies linearly. The difference between bulk mean temperature and wall temperature is constant in thermally developed region so bulk tempeature,

Here,

So, Q and R in thermally developed region.
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Most Upvoted Answer
The wall of a constant diameter pipe of length 1 m is heated uniformly...
In case of uniform heat flux, bulk mean temperature varies linearly. The difference between bulk mean temperature and wall temperature is constant in thermally developed region so bulk tempeature,

Here,

So, Q and R in thermally developed region.
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The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid 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 0°C at the in let and 50°C at the exit. The wal l temperatures are measured at three locations, P, Q an d R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made :Among the locations P, Q and R, the flow is thermally at :[2019]a)R onlyb)P and Q onlyc)P, Q and Rd)Q and R onlyCorrect answer is option 'D'. Can you explain this answer?
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The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid 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 0°C at the in let and 50°C at the exit. The wal l temperatures are measured at three locations, P, Q an d R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made :Among the locations P, Q and R, the flow is thermally at :[2019]a)R onlyb)P and Q onlyc)P, Q and Rd)Q and R onlyCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid 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 0°C at the in let and 50°C at the exit. The wal l temperatures are measured at three locations, P, Q an d R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made :Among the locations P, Q and R, the flow is thermally at :[2019]a)R onlyb)P and Q onlyc)P, Q and Rd)Q and R onlyCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q” by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid 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 0°C at the in let and 50°C at the exit. The wal l temperatures are measured at three locations, P, Q an d R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made :Among the locations P, Q and R, the flow is thermally at :[2019]a)R onlyb)P and Q onlyc)P, Q and Rd)Q and R onlyCorrect answer is option 'D'. Can you explain this answer?.
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