Research On Simulation And Optimization Of Jet-mixer Based On FLUENT

The performance of pesticide mixer is the key factor for inline pesticide mixing, but onlysingle-phase flow of water-solubility pesticide was focused on in some studies. In order to obtaingood mixing performance for non-water-solubility pesticide, the new type of mixer structurecould be studied through the mixing analysis of liquid-liquid two-phase flow.According to the analyzing of jet principle, the structural parameters of inline pesticidemixer were determined. Three kinds of mixers were designed based on jet-mixing apparatus. Themodels of these mixers were established based on Pro/E.The flow field of three mixers and one typical mixer were meshed. With the method oftwo-phase flow, numerical simulations were conducted by FLUENT. The contours of staticpressure and velocity magnitude, the pathlines and the contours of volume fraction were analyzedand studied. The results showed that the mixer with the half internal thread of the diffusingsection was the best on mixing uniformity.Aimed at obtaining the mixer with optimal structure, numerical simulations of two-phaseflow were conducted under different parameters of the structure. The research was focused on thecontours of volume fraction_pesticide. And the parameter values of which the mixer was of thebest mixing uniformity were obtained.Numerical simulations were conducted on optimized mixer respectively from two aspectsof water supply at different rates and pesticide supply at different rates. The results showed thatwhen the velocity ratio was1:1, the mixing uniformity of the mixer was best.Finally, the mixing process between the pesticide substitutes for pesticides and water wasphotographed and analyzed.The mixing experimental results were basically consistent with theFLUENT simulation results.