Abstract
This paper reports a study on the effect of orifice thickness-to-diameter ratio (τ/d) on the turbulent flow through an orifice plate. Details of the flow characteristics downstream of the orifice are investigated both experimentally and numerically for a Reynolds number of 25,000. For this purpose, seven orifice plates are manufactured with τ/d ranging between 0.27 and 1.37. Particle Image Velocimetry (PIV) is used to experimentally study the flow patterns downstream of the orifices, with particular focus on instantaneous and time-averaged velocity distributions, streamline patterns, turbulent kinetic energy, Reynolds shear stress, and out-of-plane vorticity. Results show that, with increasing τ/d, the location of the vena contracta moves closer to the orifice plate, and eventually inside for τ/d>0.55. Increasing τ/d also results in decreasing turbulent kinetic energy and Reynolds shear stress. For the selected τ/d range, experimental and numerical results are in good agreement with the thick and thin orifice classification available in the literature.
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