- it is a device used for measuring the difference of pressures, between two points in a pipe, or in...
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- It is a device used for measuring the difference of pressures, between two points in a pipe, or in two different pipes.
DIFFERENTIAL MANOMETER
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A U tube manometer measures the pressure difference between two points A and B in a liquid. The U tube contains mercury. Calculate the difference in pressure if h =1.5 m, h2 = 0.75 m and h1 = 0.5 m. The liquid at A and B is water ( ω = 9.81 × 103N/m2) and the specific gravity of mercury is 13.6.
Example 2.6
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Since C and D are at the same level in the same liquid at rest
Pressure at C = Pressure at D
For the left hand limb
For the right hand limb
since
Pressure difference
Solution to Example 2.6
DC pp
112 hshhphp BA
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A U tube manometer measures the pressure difference between two points A and B in a liquid. The U tube contains mercury. Calculate the difference in pressure if h = 2.0 m, h2 = 0.35 m and h1 = 0.5 m. The liquid at A and B is oil ( s = 0.85) and the specific gravity of mercury is 13.6.
Activity 2C
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- It is used for measuring the difference of low pressure, where accuracy is the prime consideration
INVERTED DIFFERENTIAL MANOMATER
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An inverted U tube as shown in the figure below is used to measure the pressure difference between two points A and B which has water flowing. The difference in level h = 0.3 m, a = 0.25 m and b = 0.15 m. Calculate the pressure difference pB – pA if the top of the manometer is filled with:
(a) air (b) oil of relative density 0.8.
Activity 2D
water
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In the figure 2, fluid Q is water and fluid P is oil (specific gravity = 0.9). If h = 69 cm and z = 23 cm, what is the difference pressure in kN/m2 between A and B?
Activity 2E
Figure 2