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Asked Jun 24, 2019
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5-36C The velocity of a fluid flowing in a pipe is to be
measured by two different Pitot-type mercury manometers
shown in Fig. P5-36C. Would you expect both manometers
to predict the same velocity for flowing water? If not, which
would be more accurate? Explain. What would your response
be if air were flowing in the pipe instead of water?
he dut
dlecty
Flow
Flow
2
FIGURE P5-36C
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5-36C The velocity of a fluid flowing in a pipe is to be measured by two different Pitot-type mercury manometers shown in Fig. P5-36C. Would you expect both manometers to predict the same velocity for flowing water? If not, which would be more accurate? Explain. What would your response be if air were flowing in the pipe instead of water? he dut dlecty Flow Flow 2 FIGURE P5-36C

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Step 1

Here in this setup we find the difference in stagnation pressure and static pressure heads of the fluid to find the velocity of flow.

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Flow stagnation Point Static point

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Step 2

At stagnation point kinetic energy of the fluid converts in pressure energy, the difference between the two pressure heads is equal to the lost kinetic head at stagnation point.

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stagantion Pstatic 2g Pg

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Step 3

Comparing both setups 1 and 2 we can say setup2 gives more accurate results because in setup2 both static pressure and stagnation pressures are measured at the same level(centre line of the flow) whereas in setup1 stagnation pressure...

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