Study On The Performance Of High Viscosity Liquid In High Temperature Atomization Jet

Atomized jet technology plays an important role in industrial production,medical treatment, agriculture spray and other areas, and a good atomization is also the premise of high efficiency, energy saving. The atomization mechanism of fluid directly affects the atomization effect. To ensure the quality of atomization, we must first have an in-depth study of the atomized jet technology. In recent years, with the development of technology in modern society, the liquid medium involved in the atomization process is not only limited to the traditional single-phase low-viscosity fluids, but also extends to the high viscosity fluid, and the working conditions involved in the atomization process are not limited to the room temperature pressure,but also extends to the electromagnetic, temperature, pressure and other special circumstances. Therefore, under the special circumstances, special fluids research has an important practical significance. In particular, in the specific environment,high-viscosity fluid atomization characteristic analysis is becoming a hot area of research. It has an important academic value and a wide range of industrial applications.Firstly, this paper uses CFD-Fluent VOF model to track the gas-liquid intersecting interface, and analyzes the internal gas-liquid flow pattern transition condition of the mixed nozzle cavity in detail, and obtains the relevant parameters as the initial conditions of atomized jet field. For ALR in the range of 0.02 to 0.2, we do simulation analysis on the different viscosity of liquid medium, results show that,with the increasing trend of the ALR, by the trend of polymerization, the discrete bubbles gradually culminate in an annular flow pattern. Due to the viscosity of the liquid medium is greatly influenced by temperature, we analyze a theoretical estimation of liquid viscosity-temperature characteristics then, list several common medium of viscosity-temperature characteristic curve, and analyze the changing trend of the liquid medium viscosity with the temperature in this paper.Secondly, we use the CFD- Fluent DPM model to do the numerical simulationof atomized jet flow field, considered to forces on the droplet, the secondary atomization, droplet collision phenomenon etc. Continuous gas phase uses navies-stokes equation and turbulence model, discrete droplet particle adopts tracking method, and the turbulence model use the LES method. Using the steady state and transient simulation analysis of downstream atomization field respectively,we get the droplets along the axial and radial distribution of particle size. This paper analyzes the impact of different working conditions on the jet atomization.With different temperature close to the boiling point of liquid medium on the atomization field simulation, we discusse and analyze the effect of temperature on glycerol through the distance,the effect of temperature on the changes of SMD,the axial distribution of SMD under different temperature,the radial distribution of SMD under different temperature and so on.Finally, we quantify the ALR, the nozzle diameter, the incident pressure,surface tension, viscosity and other factors on the trend of the SMD along the axial deformation, use the method of dimensionless multiplicative to get SMD prediction formulathe, and compare with experimental data of the previous paper published,the result indicates that the formula has a certain reference value. The paper provides a new way of thinking for the particle size prediction of the industry.