In this work, we explored the effect of AC corona discharge on water evaporation in a strong electric field by using a multipin-dielectric-plate EHD system. Our experiments demonstrated that the AC corona discharge could produce a significant amount of heat because of the Joule and dielectric heating of the dielectric barrier. When the electric field strength was below the ionization point and current density did not exceed 1 mA/m², the heating was not substantial. At the initial stage of corona discharge with the current density below 10 mA/m², the cooling effect of evaporation compensated the Joule heating of the dielectric barrier, keeping wet material surface below wet-bulb temperature. With a current density above 10 mA/m², the AC heating effect became dominant. At 40 kV applied voltage and current density of 38 mA/m², the temperature of the dielectric increased from 22 °C to 25 °C and the material surface reached wet-bulb temperature. A theoretical model of the relationship between material temperature, electric field strength, discharge current and drying rate in EHD drying was developed and experimentally verified.

在这项工作中，我们通过使用多针介电板 EHD 系统探索了交流电晕放电对强电场中水蒸发的影响。我们的实验表明，由于介电屏障的焦耳和介电加热，交流电晕放电会产生大量热量。当电场强度低于电离点且电流密度不超过1mA/m ^{2 时}，加热不明显。在电流密度低于 10 mA/m ²的电晕放电初始阶段，蒸发的冷却效应补偿了介电屏障的焦耳热，使湿材料表面保持在湿球温度以下。电流密度高于 10 mA/m ²，交流加热效果成为主导。在 40 kV 施加电压和 38 mA/m ²电流密度下，电介质的温度从 22 °C 增加到 25 °C，材料表面达到湿球温度。建立了EHD干燥中物料温度、电场强度、放电电流和干燥速率之间关系的理论模型并进行了实验验证。