ESDU 81039
Flow of liquids. Pressure losses across orifice plates, perforated plates and thick orifice plates in ducts.
Abstract:
ESDU 81039 provides basic data for use in the calculation of pressure losses for incompressible flow (generally liquid flow) in ducts containing orifice plates, perforated plates and thick orifice plates or in the determination of a suitable geometry for a pressure reducing orifice in a duct. Data are given for porosities in the range 0.001 to 1.00; although the data were derived basically for symmetrical arrangements of circular holes in circular plates they were found to apply reasonably well for square ducts, square holes and small departures from symmetry. General features of flow through orifices are discussed. A flowchart calculation procedure is included. Compressible flow is dealt with in ESDU 82009.Indexed under:
 Orifices
 Perforated Plates
 Pressure Drop Across Obstructions in Ducts
 Pressure Drop in Internal Flow
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Data Item ESDU 81039  

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This Data Item contains 7 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Effect of porosity on incompressible flow pressureloss coefficient for t/d = 0 and 0.8 
Figure 2  Effect of porosity on incompressible flow pressureloss coefficient for separated flow, t/d = 0 
Figure 3  Correction factor for effect of t/d ratio on incompressible flow pressureloss coefficient for separated flow 
Figure 4  Effect of porosity on incompressible flow pressureloss coefficient for reattached flow, t/d = 0.8 
Figure 5  Correction factor for effect of t/d and α on incompressible flow pressureloss coefficient for reattached flow 
Figure A1  Part 1  K_{i} in the region of changeover between separated and reattached flows 
Figure A1  Part 2  K_{i} in the region of changeover between separated and reattached flows 
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