Numerical Simulation Study On The Process Of Porous Plate Hydrodynamic Cavitation Generator

Cavitation is a very complex fluid dynamic phenomena that vacuoles between the interface of liquid-solid, liquid-liquid or gases inside are formed, developed and collapsed. Accompanied by strong shock wave and high-speed jets, instantaneous high temperature and high pressure are produced when vacuoles move and collapse in liquid. These characteristics make cavitation available when a chemical reaction is unlikely to occur under normal condition.In order to explore the mechanism of cavitation, optimize and design cavitation generator, seek optimal structural parameters of cavitator, provide a theoretical basis and guidance for the development of hydrodynamic cavitation device, numerical simulation method is used in this paper. Single, double, three-hole and four-hole are used as orifice plate for numerical modeling. Conducted is the summery of the design parameters required for hydrodynamic cavitation device by numerical simulation with FLUENT software as solver and TECPLOT software as post-processing.In-depth study on cavitation effects of different pore size and structure is performed. Firstly, carried on are researches that different pore sizes and orifice plate opening rate’s effect are conducted on single holes that have less impact on cavitation factor. According to single hole cavitation intensity, appropriate orifice plate opening rate is selected. Then, effect of different pore size arrangement can be concluded.According to the results of the simulation, cavitation occurs firstly in the basin of orifice plate, some opening rate is needed when cavitation occur in downstream of orifice plate. The degree of cavitation is increasing as the opening rate become large. Orifice plate hole space has great impact on cavitation intensity. The closer the porous arrangement, the easier superposition of overall speed, which have less influence on the radial extent. The closer the porous towards pipe wall, the more scatter of overall rate, which also make less influence on the radial extent. Suitable holes arrangement maximize the influence upon radial velocity field of pipe, so that the highest of cavitation is available.