Research On The Characteristics Of Hydraulic Cavitation

Hydraulic cavitation is a new type of water treatment technology in recent years.It is a phase change process of liquid from liquid phase to gas phase.Cavitation growth and collapse in the liquid generated when the local high temperature and pressure,shock waves,high-speed jet and other extreme physical conditions.In the hydraulic machinery,cavitation should be avoided as much as possible,so as to avoid damaging the machinery.However,this kind of characteristic can also make the chemical reaction difficult to be realized under normal conditions.As we are using,the energy released by cavitation exerts a great influence on the chemical physics process Strengthen.However,this technology is not mature enough to be used on a large scale in factories.Therefore,it is necessary to study the characteristics of hydraulic cavitation and lay the foundation for future applications.In order to explore the application prospect of hydraulic cavitation,this paper mainly studied the oxidation and dispersion characteristics of hydraulic cavitation by FLUENT flow field simulation,methylene blue degradation and nano-hydroxyapatite dispersion.Based on the FLUENT software ?-? model,the numerical simulation of the fluid flow in the orifice hydrodynamic cavitation reactor was conducted.The selected porosity and pore number were the same.The pore numbers were the same with the same arrangement and the same number of pores were different.The series of perforated plate cavitator,the annular arrangement than the staggered arrangement,the cross-arranged perforated plate cavitator cavitation effect is better;the same arrangement of the orifice plate,a small aperture plate cavitator empty the effect is better;the same porosity of the hole plate,the hole number of holes cavitator cavitation better.Hydrodynamic cavitation degradation of organic matter using methylene blue as a simulated pollutant in water,the operating conditions and the orifice plate structure on the degradation of methylene blue effect,in which the orifice plate structure with analog part of the same rules,in addition to discuss the hydrodynamic cavitation oxidative degradation of organic matter The purpose of the feature is to experimentally verify the simulation part.The experimental results show that the degradation rate of methylene blue decreases with the increase of the initial concentration,and then increases with the increase of the operating time as the solution temperature and inlet pressure increase first and then decrease,and the increase rate slowing shrieking.The optimum operating conditions for hydrocyanation degradation of methylene blue were as follows:inlet pressure 0.35 MPa,time 4.0 h,MB initial concentration 0.53 mg·L-1 and solution temperature 35 ?.The average MB degradation rate under the optimum conditions was 11.87%.Hydrodynamic cavitation degradation of organic compounds in line with the first-order kinetic reaction model.The optimum orifice plate cavitator was applied to study the water nano-hydroxyapatite dispersion experiment by Zeta potential analyzer,SEM analysis that the combination of hydrodynamic cavitation-dispersant nano-hydroxyapatite dispersed in water The effect is better.The optimum conditions of hydrodynamic cavitation-dispersant dispersive nano-hydroxyapatite were HA concentration 0.50 g·L-1,Nap:HA 10:1,inlet pressure 0.35 MPa,operating time 25 min and dispersion temperature 20 ?.The dispersion rate of dispersed system averaged 82.0 w%and the average particle size was 191.2 nm.