What are the factors that affect the drying rate of ceramic tableware?

The factors that affect the drying rate of ceramic white porcelin dinnerware are: heat transfer rate, external diffusion rate, and internal diffusion rate. 1. Speed u200bu200bup the heat transfer rate To speed up the heat transfer rate, the following should be done: ①Increase the temperature of the drying medium, such as increasing the temperature of the hot gas in the drying kiln, increasing the hot blast stove, etc., but not making the surface temperature of the green body rise too fast to avoid Cracking, ②Increase the heat transfer area: such as changing from single-sided drying to double-sided drying, layering the code blank or reducing the number of code blank layers, increase the surface in contact with the hot gas, ③ increase the convective heat transfer coefficient. 2. Increase the external diffusion rate. When the drying is in the stage of constant speed drying, external diffusion resistance becomes the main contradiction of the overall drying rate. Therefore, reducing external diffusion resistance and increasing external diffusion rate have the greatest impact on shortening the entire drying cycle. The external diffusion resistance mainly occurs in the boundary layer, so the following should be done: ①Increase the flow velocity of the medium, reduce the thickness of the boundary layer, etc., and improve the convective heat transfer coefficient. It can also increase the convective mass transfer coefficient, which is beneficial to increase the drying speed. ②Reduce the water vapor concentration of the medium, increase the mass transfer area, and increase the drying speed. 3. Improve the internal diffusion rate of water. The internal diffusion rate of water is combined by moisture diffusion and thermal diffusion. Moisture diffusion is the movement of moisture in the material due to the humidity gradient, and thermal diffusion is the movement of water caused by the temperature gradient in physics. To increase the internal diffusion rate, the following should be done: ① Make the direction of thermal diffusion and moisture diffusion consistent, that is, try to make the center temperature of the material higher than the surface temperature, such as far-infrared heating, microwave heating, ②When the direction of thermal diffusion and moisture diffusion are the same, Strengthen heat transfer and increase the temperature gradient in the material. When the two are opposite, although the enhanced temperature gradient enlarges the resistance of thermal diffusion, it can enhance heat transfer. The temperature of the material increases, and the moisture diffusion increases, so drying can be accelerated, ③reduce Thin body thickness, change from single-sided drying to double-sided drying, ④ reduce the total pressure of the medium, increase the wet diffusion coefficient, thereby increasing the wet diffusion rate, ⑤ other factors such as the nature and shape of the body.

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