Performance of models to determine flow rate using orifice plates

ABSTRACT This study aimed to evaluate three methodologies for orifice-plate water-flow estimation by quantifying errors in the flow determinations to propose an appropriate measurement range for each evaluated condition. Two orifice-plate models (nominal diameters of 100 and 150 mm) with 50% restriction in the flow section were evaluated. In the theoretical equations, the discharge coefficient was obtained using the Reader-Harris/Gallagher equation (Method 1) and approximated from experimental data using the angular coefficient of a zero-intercept straight line (Method 2). The recommended measurement ranges for errors that were lower than 5% for the 100 and 150 mm plates were 30 to 65 m3 h-1 and 70 to 130 m3 h-1 using the theoretical equation and 20 to 65 m3 h-1 and 40 to 130 m3 h-1 using the empirical equation, respectively. The Reader-Harris/Gallagher equation (Method 1) adequately estimated the discharge coefficient of the orifice plates; however, the use of empirical equations (Method 3) demonstrated smaller measurement errors and greater rangeability of the evaluated flow meters.

Bibliographic Details

Main Authors:	Cano,Nicolas D., Camargo,Antonio P. de, Muniz,Gustavo L., Oliveira,Jonesmar de, Dalfré Filho,José G., Frizzone,José A.
Format:	Digital revista
Language:	English
Published:	Departamento de Engenharia Agrícola - UFCG 2021
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662021000100010
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