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- W2084689863 abstract "The accurate measurement of flow rate using orifice plates depends upon many factors. One such factor is the condition of the flow in the pipe just upstream of the metering station. The values of discharge coefficient presented in the flow measurement standards are based upon axi-symmetric, fully developed turbulent velocity profiles, with no swirl component. In practice, such ideal flow conditions are very difficult to achieve, because of the effect of various pipe fittings such as bends, tees, and valves upstream of the meter. These fittings distort the velocity profile, and generate secondary flows which are only damped out very slowly by the action of turbulent shear stresses. The aim of this paper is briefly to review the way in which a range of pipe fittings disturb the condition of flow, and then to discuss the ways in which the various classifications of disturbance affect the flow through the orifice plate. From this basic understanding of the physics of the flow field, it is possible to build up a picture of the way in which the discharge coefficient of an orifice plate will be affected in a non-ideal installation, and to appreciate the effect of such variables as the area ratio of the device. The qualitative description given in the paper will be supported and supplemented by reference to an extensive experimental programme being carried out at BHRA Fluid Engineering in conjunction with the National Engineering Laboratory of the Department of Industry, under a Metrology and Standards Requirements Board Contract." @default.
- W2084689863 created "2016-06-24" @default.
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- W2084689863 date "1979-03-01" @default.
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- W2084689863 title "The effect of disturbed flow conditions on the discharge coefficient of orifice plates" @default.
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- W2084689863 doi "https://doi.org/10.1016/0142-727x(79)90019-5" @default.
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