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Title: Beta Ratio, Swirl, And Reynolds Number Dependence Of Wall Pressure In Orifice Flowmeters
Author: Gerald L. Morrison, Robert E. Deotte, Meril Moen, Ken R. Hall, James C. Holste
Source: 1990 International Symposium on Fluid Flow Measurement
Year Published: 1990
Abstract: Experimental work has been performed in an effort to gain a better understanding of the flow field inside orifice flowmeters and the pressure field generated on the walls of the pipe and orifice plate. As a part of a larger study, extensive wall pressure measurements have been made on the pipe wall from four pipe diameters upstream of the orifice plate to eight pipe diameters downstream as well as on both the upstream and downstream faces of the orifice plate. These measurements were performed for Reynolds numbers of 54,700 91,100 and 122,800 for beta ratios of 0.50 and 0.75 using air as the working fluid. An adjustable swirl plate was installed which was used to impart varying amounts of swirl into the flow upstream of the orifice plate. For each swirl case, Pitot and static pressure probes were used to characterize the upstream flow field while the pipe wall and orifice plate surface pressures were measured.

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