Research The Key Technologies Of The Electrostatic Glazing In Ceramics Based On CFD

Electrostatic glazing has many advantages, through this way we can obtain good glazing effect, save materials, improve the utilization of glaze, reduce the scrap rate of ceramics, reduce pollution, etc, and it has been widely recognized. However, in china ceramic industry, it has yet to be promoted and applied. The main reason is lack the knowledge of electrostatic equipment principle and atomization mechanism and have no relevant experience of select and optimize those important process parameters while matching those parameters reasonable. In order to solve the above problems, this article surround the technique of electrostatic glazing are as follows:(1) Voltage discharge mechanism and glaze glazing electrostatic atomization mechanism were studied and analyzed. Based on CFD analyzed fluid continuity equation and momentum equation and the movement of glaze, at the same time, established the mathematical model of glaze movement in the rotary cup, built the Mathematical Model to analyze the influence of electrostatic field in glaze fogging.(2) Combine of Hydrodynamics to establish the electrostatic glazing system model, use the meshing technique of sub-zone grid division. DPM model is used to simulate the glaze drip in the air field, through MHD electromagnetic force procedures, with UDS added power equation, and then use the UDF to add electric field on the momentum equation, thus, we can get the numerical simulation of the electrostatic glazing process by FLUENT software.(3) Analysis of the voltage, glaze pressure, glaze viscosity which affect electrostatic glazing result. Through the simulation of the three single factors on electrostatic glazing quality, get the glaze drip diameter distribution and glaze drip velocity distribution closed to the ceramic surface, we can get three conclusions respectively that under the circumstance of the voltage of -30KV,the glaze pressure of 2.5bar, the glaze viscosity of 0.4Pa.s can obtain a good electrostatic quality.(4) For the use of orthogonal test method in mathematical statistics, analyzed the influence of these three parameters on electrostatic glazing comprehensively. Then, analysis of three parameters under the effect of orthogonal on the index factor. Through this way,we can get the significance result of the three parameters to electrostatic glazing Effectiveness and efficiency, the conclusion is voltage affect the glazing effect maximum, followed by glaze pressure, glaze viscosity minimum, Finally, obtained that at a voltage of -50KV, glaze pressure of 2.5bar, glaze viscosity of 0.9Pa.s,these three parameters combined to the best match value, through this way we can get a high electrostatic glazing quality.(5) By electrostatic glazing experiments to verify the simulation result of voltage, pressure, viscosity. Obtained in these three process parameters, simulation and experimental results are similar trends. From the result of average glaze drip diameter under different parameters can get a good particle size and particle distribution under the voltage of -30KV, glaze pressure of 1.91 bar, glaze viscosity of 0.6Pa.s,.At last, Comprehensive three parameters to analyze the Orthogonalization of three parameters, we can get the best value of (-30KV,1.91bar,0.6Pa.s) which is consistent to the simulation result.The results of this simulation laid the theoretical foundation of make the select of process parameters reasonable on electrostatic glazing, has a certain reference value.