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A U-tube manometer with a small quantity of mercury is used to measure the static pressure difference between two locations A and B in a conical section through which an in compressible fluid flows. At a particular flow rate, the mercury column appears as shown in the figure. The density of mercury is 13600 kg/ m3 and g - 9.81 m/s2. Which of the following is correct?
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- Flow direction is A to B and PA – PB = 20 kPa
- Flow direction is B to A and PA – PB = 1.4 kPa
- Flow direction is A to B and PB – PA = 20 kPa
- Flow direction is B to A and PB – PA = 1.4 kPa
Correct Option: A
PA – PB = rg. Dh
= 13600 × 9.81 × .15
= 20 kPa
As pressure is decreasing from A to B, so flow direction is A to B.
