Pressure drop is of paramount importance in a fluid flow. Single phase pressure drop occurs in a pure liquid or pure gas flow. Two phase pressure drop occurs in phase changing equipments like evaporators and condensers of refrigeration air conditioning plants and heat pumps. Maximum two/ three types of pressure drop (frictional, gravitational and acceleration) can occur in a single or two phase flow. In each case, pressure drop take place in straight pipes. Several empirical equations and correlations have been developed and compared for the pressure drop. Consequently well planned pipe layout and judicious selection of proper pipe material, pipe fittings and valves will result in reducing the overall pressure drop which in turn will reduce the running cost.
Pressure drop, Single phase, Two phase, Frictional, Gravitational, Acceleration
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