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
Details:
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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 pressure-loss coefficient for t/d = 0 and 0.8 |
| Figure 2 | Effect of porosity on incompressible flow pressure-loss coefficient for separated flow, t/d = 0 |
| Figure 3 | Correction factor for effect of t/d ratio on incompressible flow pressure-loss coefficient for separated flow |
| Figure 4 | Effect of porosity on incompressible flow pressure-loss coefficient for reattached flow, t/d = 0.8 |
| Figure 5 | Correction factor for effect of t/d and α on incompressible flow pressure-loss coefficient for reattached flow |
| Figure A1 - Part 1 | Ki in the region of changeover between separated and reattached flows |
| Figure A1 - Part 2 | Ki in the region of changeover between separated and reattached flows |