Erosion-Corrosion Characteristics of Venturi Tubes Based on Forced Annular Flow

Due to the limited research on the erosion-corrosion of vortex-induced or forced annular flow in Venturi tubes in current studies, CFD-DEM fluid solid coupling numerical calculations were conducted using commonly used swirl blade angles, inlet moisture content, continuous phase fluid flow velocity, and discrete phase solid particle size and concentration in practical applications. The results show that the maximum erosion-corrosion rate of Venturi tubes exhibited an exponential relationship with the swirl blade inclination angle, and the erosion-corrosion rate initially increased and then decreased as the inclination angle increased. The maximum value was 2.36×10^-2 kg/(m²·s) at the blade inclination angle of 45°. The erosion-corrosion rate increased slightly with the increase of moisture content, then rapidly decreased, and finally remaine'd basically unchanged. The erosion-corrosion rate increased with the increase of continuous phase flow velocity. The erosion-corrosion rate increased in a linear manner with the increase of particle size, and the erosion-corrosion rate trend varied with particle concentration. The prediction model for maximum erosion-corrosion rate, developed using multiple nonlinear regression, demonstrated high accuracy.