Performance evaluation of orifice plate assemblies under non-standard conditions using CFD

Abstract

The performance characteristics of small diameter orificemeters (diameter = 40 mm NB) for four diameter ratios with higher plate thicknesses are evaluated using computational fluid dynamics (CFD) under the non-standard conditions using water as the working fluid. The plate thicknesses considered are larger than the maximum allowed thickness specified in standard, ISO- 5167. The study has shown the effect of plate thickness on the value of C_d to be only marginal up to twice the allowable plate thickness for all the diameter ratios studied. The value of the C_d marginally decreases with increase in the plate thickness for lower <img src='/image/spc_char/beta.gif' border=0> values, whereas the value of C_d increases with increase in plate thicknesses for higher <img src='/image/spc_char/beta.gif' border=0> values.