Author : Mahendra Babu .K.J 1
Date of Publication :19th April 2017
Abstract: The multi hole orifice plate is one of the effective devices for measuring flow rate accurately. In this study an experimental and numerical investigation of the flow characteristics behavior caused by a water flow through a multi hole orifice configuration is reported. A circular centered single hole orifice and a multi hole orifices are tested. Orifices of interest for present study have an area ratio of 0.36, equivalent diameter ratio of 0.6 and number holes between 4 to 25. Discharge coefficients for flow through multi hole orifices are evaluated. Parameters investigated were hole numbers, orifice pressure drop, Reynolds number and effect of plate design. Computational fluid dynamics calculations (CFD) using the k-ε turbulence model to predict velocity fields, pressure loss and discharge coefficient around this device. Advantages gained by using multiple holes in an orifice plate instead of single hole are discussed. It is shown that number of holes, hole diameter and aspect ratio influences the discharge coefficients. Tests were conducted under laboratory conditions. The experimental results were compared with numerical modeling and appropriate conclusions are discussed.