Numerical Simulation and Analysis of Gas-Liquid Two-Phase Flow in a Venturi Tube

The Venturi tube, a widely used cavitation-generating device in the petroleum and chemical industries, is valued for its simple structure and safe stability. During cavitation-induced gas-liquid two-phase flow, collapsing bubble clusters release high temperature and pressure energy with associated effects. This study uses Fluent to investigate the Venturi tube’s internal flow field characteristics. By comparing pressure contours, velocity contours, and gas phase distributions under varying inlet-outlet pressure ratios, throat length-to-diameter ratios, and diffusion angles, it analyzes cavitation flow evolution. Results show: for a fixed-structure Venturi with constant outlet pressure, stronger cavitation effects occur with higher inlet pressure, larger throat length-to-diameter ratios, and smaller diffusion angles. These findings clarify internal flow patterns and the influence of hydraulic and structural parameters on cavitation intensity.