高压射流磨振荡反应腔CFD模拟及结构优化

CFD simulation and structure optimization of the industry-scale microfluidization interactive chamber

目的:解决工业级高压射流磨(industry-scale microfluidizer,ISM)在实际应用中存在的进料要求高、处理量小、处理效果不佳问题。方法:结合CFD-PBM模拟和乳液制备试验对4种振荡反应腔进行选优,再通过尺寸优化获得最终腔型。结果:4种反应腔相比于原反应腔都拥有更大的孔径和流量;粒径细化效果为T字撞击型>T字—二次撞击型>十字撞击型>二分管型4种反应腔的分流管区均主要存在剪切作用力,撞击管区主要存在撞击作用力,射流管区主要存在剪切作用力和空穴作用力,以上3个区域均存在强湍流。对T字撞击型反应腔进行尺寸优化,得到最终的反应腔模型,其最小管径为0.7 mm,在120 MPa下流量可达878 L/h。优化所得腔型制备的乳液粒径为249 nm,与模拟粒径结果吻合良好。结论:T字撞击型反应腔更具粒径细化优势,撞击作用力是粒径细化的主要因素。

Objective:Solving the problems of high feed requirement,low flow rate and poor treatment effect of industrial-scale microfluidizer(ISM)in practical application.Methods:Combining CFD-PBM simulation and emulsion preparation test,four kinds of interactive chambers were optimized,and the final shape was obtained by size optimization.Results:Four kinds of interactive chambers had larger flow rate and hole diameter than the original interactive chamber.The effect of particle size reduction was T-impact type>T double impact type>cross impact type>two shunt type.Shear force mainly existed in the shunt zone,impact force mainly existed in the impact zone,shear force and cavitation force mainly existed in the jet zone.Turbulent motion existed in the above three zones.The geometric parameters of T-shaped impact reaction chamber were optimized to obtain the final reaction chamber model.The minimum hole diameter was 0.7 mm,and the flow rate was 878 L/h at 120 MPa.The emulsion partical size prepared by the optimized chamber was 249 nm,which was in good agreement with the simulation results.Conclusion:T-impact type interactive chamber has the advantage of particle size reduction,and the impact force is the main factor.