Effect of Wall Roughness on Cavitation Flow Field in Venturi Tube
1. School of New Energy, China University of Petroleum (East China), Qingdao 266580, China;
2. Qingdao Osens Environment and Safety Technology Co Ltd, Qingdao 266580, China
Abstract Hydraulic cavitation is of great significance for the chemical reaction rate and chemical yield improvement. In order to explore the effect of roughness on cavitation flow characteristics in venturi tube, the neynolds N-S equation, standard k-ε equation and ZGB full cavitation model were used to establish the numerical calculation model. By analyzing the distribution of vapor volume fraction and the change of turbulent kinetic energy in venturi, the influence of roughness on the cavitation flow field was studied. The results showed that considering the roughness of the whole pipe, the pressure loss along the flow path increased when the roughness was large, thus the cavitation intensity was suppressed. When considering the roughness at only a certain location, the roughness would increase the number of micro-gas nuclei attached to the inner wall to strengthen cavitation, and the optimization effect was the best when the roughness of the gradually expanding section was 0.006 4 mm.
