In this numerical study, Commercial CFD(Computational Fluid Dynamics) code, ANSYS CFX ver. 15.0, is used to analyze the 3-Dimensional flow characteristics through orifice plate(β=0.6) in different plane with two 90 degree bends. The purpose of this n...
In this numerical study, Commercial CFD(Computational Fluid Dynamics) code, ANSYS CFX ver. 15.0, is used to analyze the 3-Dimensional flow characteristics through orifice plate(β=0.6) in different plane with two 90 degree bends. The purpose of this numerical study is to evaluate measurement accuracy and flow characteristics of orifice flowmeter depending on upsteam straight length from 10D to 60D. Thus, calculation of pressure drop caused by swirl and distortion of axial velocity profile on orifice plate is conducted by using CFD. In addition, numerical analysis results are compared with ASME PTC 19.5 recommended straight length for orifice plates and nozzles. The results show that if upstream straight length of orifice plate is more than 32D, there was little deviation of differential pressure. Therefore, guideline of minimum upstream straight length recommended by ASME PTC 19.5 is somewhat strict.