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Title: Universal Slotted Orifice Flow Meter Flow Coefficient Equation For Single And Two Phase Flow
Author: G.L. Morrison, K.R. Hall
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: The slotted orifice flow meter has been evaluated in terms of its applicability as a two or multi phase flow meter. The response of the meter to air/water and steam/water mixtures in a horizontal pipe with flow qualities varying from 100% gas to the onset of slugging flow have been measured. A study of the orifice flow equation has shown that the discharge coefficient can be expressed as a function of the Euler number and ratio instead of the Reynolds number, ratio, and pipe diameter. This eliminates the pipe diameter and fluid viscosity from the discharge coefficient calculation resulting in a simplified relationship. Beta ratios of 0.50, 0.467, and 0.43 were considered in a 50.4mm diameter pipe with the results reducing to a common relationship. The use of the slotted orifice plate in two phase and multi phase flow meters is discussed along with the proposal of a multi-phase flow meter consisting of two different ratio slotted orifice plates placed within a fifteen pipe diameter long meter run which requires only the measurement of two pressure differentials to determine the mass flow rate and mixture density.

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