![]() ![]() Therefore, the formula for flow rate ( Q), also known as "discharge rate" expressed in terms of the flow area ( A) and its velocity ( v) is the so-called discharge equation: The volumetric flow rate of a stream of liquid or gas is equal to the flow velocity multiplied by its cross-sectional area. It should be noted that the Poiseuille formula for calculating a pipe's flow rate through pressure does not work so well for gases where additional information is required for an accurate computation. The graph illustrates a general case where that applies. Mineral oils, however, are somewhat compressible, so beware of using the formula for such cases.Īn example application is if one has manometers measuring the pressure of the fluid or gas at the start an the end of the section of piping that the flow rate is to be calculated for. Water is a good example of an incompressible fluid, and so is any hydraulic fluid. ![]()
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