Abstract
Recent work with computational fluid dynamics (CFD) tools has shown that this technique can help to improve flow conditioner and metering technology. In this study, CFD models are used to examine trends and provide insights into the velocity and turbulence field downstream of various flow conditioners installed in fully-developed flow. Several parameters which may affect turbulent mixing and flow conditioning downstream of a plate are studied. These include the overall porosity, the grading of porosity along the radius, the wetted perimeter and the number of holes in the plates. It seems that graded porosity is responsible for quickly obtaining a velocity profile close to being fully developed. The blocking area, which is correlated with porosity, is responsible for the pressure drop and the production of turbulent kinetic energy. The latter controls the mixing level and modifies the velocity profile further downstream. High turbulence levels downstream of the flow conditioner requires longer distance before the flow structure is 100per cent fully developed. This mechanism probably explains why the combined flow conditioners can be more efficient.
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