This Technical Note discusses the studies conducted by ESDU for the CFD validation of the predictions for pressure loss@ discharge coefficient and flow characteristics in square-edged orifice plates. These studies used the validation data from the literature reviewed in ESDU TN 07007. The purpose of this work was to generate validated CFD predictions for: ? square-edged and knife-edged orifice plates@ free of burrs and other contaminants@ ? circular@ concentric orifices in circular pipes with identical upstream and downstream cross-sectional areas@ ? fully-developed flow conditions upstream and downstream of the orifice@ ?swirl-free@ steady flow conditions with no cross-flow upstream or downstream of the orifice plate and flow normal to the orifice plate@ ? laminar@ transitional and turbulent flow regimes@ ? single-phase@ Newtonian liquids and gases in incompressible flow (Mach number ??0.3 at the vena contracta plane). The CFD validation studies covered the following geometrical configurations and pipe Reynolds numbers: ? orifice to pipe diameter ratios: 0.3 ??????0.7; orifice thickness to diameter ratios: 0.01 ??t/d ??5.0. ? pipe Reynolds number: 10 ??ReD ??105. Based on the comparisons of the ESDU CFD predictions with the experimental data in the literature@ best practice guidelines are provided for the modelling of the flow characteristics and pressure loss in square-edge orifice plates.
TN 10013-2011 history
2011TN 10013-2011 CFD validation studies for incompressible flow through square-edged orifice plates