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Flow Rate of Fluids in Pipes
With this tool, it is possible to easily calculate the average volumetric flow rate of fluids by changing each of the three variables: length, pressure and bore diameter. The effects on the predicted flow rate are then given in three graphs, where in turn two of the variables are kept constant and the flow rate is plotted against a range of values of the third.
The quantity of fluid that will be discharged through a hose depends on the pressure applied at the feed end, the hose length and bore diameter. The surface character of the bore, the number, and shape of bends incorporated in the run of the hose also influence the flow rate.
The pressure is sometimes stated as ‘head of water’. If the head is given in metres of water, each 1-metre head (3.28 ft) induces 0.1 bar (1.47 psi.) pressure.
All formulae for finding the amount of fluid that will flow through a hose at a given time, are approximate. The graphs below are generated from calculations assuming the hose to be in good condition and laid in a straight line. With this being the case, they will be accurate to within 10% of the actual results obtained.
If the set of conditions entered in the model generate negative answers, then clearly it is necessary to adjust the variables as appropriate until a realistic result is obtained.
