Numerical Investigation of Non-Newtonian Liquid–Gas Flow in Venturi Flow Meter Using Computational Fluid Dynamics

Venturi flow meter is used in several industries that varies the flow characteristics of a fluid (either liquid or gas) traveling through the tube. Therefore, study of venturi is important to design properly and improve efficiently in all aspects. In this research, computational fluid dynamics simulations as a numerical method are used to predict two-phase flow in venturi. Algebraic slip mixture multiphase model coupled with turbulence model is employed to study the fluid dynamics of the venturi. The effect of passing non-Newtonian fluid through venturi throat on discharge coefficient was investigated. Results showed that the discharge coefficient increases with increasing fluid velocity and decreases continuously by increasing gas volume fraction. Also, liquid viscosity and its rheological model have a major influence on pressure drop, and flow characteristics in venturi and its effects in venturi throat are considerable.