Question 2 In order to measure the pressure fluctuations at RS, a water-manomete

Question

Question 2 In order to measure the pressure fluctuations at RS, a water-manometer like that of the Figure below will be used. The points FS and RS are connected to each of the branches, as shown in the Figure. The static pressure at RS is expected to fluctuate at most 2% of the pressure at FS, so prs,s is expected to be within the interval [-0.02prs.se 0.02pfs.]. a) Determine the value of H when the velocity at RS is zero. b) Determine the maximum expected values of H corresponding to the expected pressure fluctuations at point RS. c) Determine the maximum value of H necessary to accommodate these pressure variations. d) Will A be always as shown in the Figure, or it can be expected to be also higher in the opposite branch? Explain. PFS PRS + air air Ap = PwatergH D II, water water

Explanation / Answer

(d)  

within the interval it is given that the pressure in RS is always less than pressure in FS so H always will be higher in shown limb.

but according to explanation it is given that the pressure in RS is fluctuating at most 2% of the pressure in FS means pressure varies from 0.98 of FS to 1.02 of FS.

according to this when pressure is more in RS then H will be in another limb.

So the final conclusion is, in which side of pipe pressure is less than other side water will rises in that limb (lower pressure pipe side limb)

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