Problem 1.2 - Using two manometers to measure pressure drop and downstream pressure of compressed air flowing in a pipe
A Throttling Valve is often used to control the downstream pressure of a high pressure fluid (such as steam or air) flowing in a pipe. In the following diagram we have a water manometer to measure the pressure drop ΔP caused by the throttling valve as well as a mercury manometer to measure the downstream pressure of the air.
If the height difference in the water manometer h w is 150 cm, and that in the mercury manometer h Hg is 225 cm, determine a) the pressure difference ΔP [ 14.7 kPa ] and b) the downstream absolute pressure of the air P 2 [ 400 kPa ]. Assume that the density of water is 1000 kg/m 3 , the density of mercury is 13,600 kg/m 3 , and that the atmospheric pressure is 100 kPa.
Engineering Thermodynamics by Israel
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