Numerical Simulation And Experimental Investigation Of Ceramic Body Temperature And Humidity Variation In Drying Process

Drying is a very important part in the process of ceramic production,it directly affects the quality of the products and production efficiency.By using the method of numerical simulation and experimental study,this paper focuses on the green body of building ceramic tiles drying medium's temperature and humidity and how they influence the drying process.Firstly,the roller type experiment drying equipment designed for numerical simulation and experimental research.Secondly,based on the evaporation condensation theory,established evaporation condensation drying mathematical model of unsteady Euler thin-wall,then used the FLUENT software to assume a humidity and based on the data of actual production condition,with dry air and the relative humidity of 50%wet air as drying medium,drying process numerical simulation with the same temperature(160?)on a piece of ceramic body.By simplifying drying model,compared the effect of the two kinds of drying conditions,then come to qualitative conclusions.Finally,measured the dry production data of ceramic body,Changed the temperature and humidity drying parameters inside the different stages of ceramic body for contrast experiments,It is concluded that when drying powder bodies(600 x 600 x 11 mm)using high temperature and high humidity air as drying medium in initial stage(10 minutes),and then using high temperature lower humidity,finally using the low temperature and dry air as drying medium.this method not only can ensure the quality of dry body also can improve the efficiency of drying.Paper get the following main conclusions:1.Drying medium for dry air condition of FLUENT numerical simulation shows:there is no condensation phenomenon on body surface,therefore moisture is monotone decreasing,if Elevating the temperature of the medium will result in uneven temperature of the body.2.Drying medium for wet air condition of FLUENT numerical simulation shows:the high temperature and humidity encounter cold wall(ceramic body)will occur condensation,so the body moisture thickness will increase at the early drying stage,with body temperature rise rapidly,also speeds up the evaporation effect in initial stage;Wet air makes body uniform temperature is better than the dry air.3.Now drying condition of the initial stage in the factories is low temperature,high humidity,in this paper,the experiment results shows that:in the initial stage with high temperature,high humidity air as drying medium,can improve the drying efficiency,shorten the drying period of 20-30%,and ensure the body don't craze.The rapid drying process curve can be made,according to control the temperature and humidity parameters for numerical simulation and experimental results.it also can guide the drying equipment design,this paper has a great guiding significance to improve the efficiency of drying process.