Kim Ji Yeop, Lee Sang Ji, Baik Gwang Yeol, Hong Jung Goo
School of Mechanical Engineering, Kyungpook National University, Bukgu, Daegu 41566, Republic of Korea.
ACS Omega. 2021 Oct 26;6(44):29724-29734. doi: 10.1021/acsomega.1c04119. eCollection 2021 Nov 9.
Electrostatic spraying is a method of atomizing a fluid using a high voltage as an atomization auxiliary device, and various spraying modes exist according to experimental parameters and viscosity. A maximum of 11 spray modes were identified according to the changes in the applied voltage and flow rate. To produce fine droplets and a uniform size, which are the advantages of electrostatic spraying, in this experiment, the Sauter mean diameter (SMD) and SMD distribution were evaluated in each spray mode of electrostatic spraying. By comparing the other spray modes with the cone jet mode, it was confirmed that the maximum difference of the SMD was less than 1.5 times and the standard deviation of the rotated and pulsed jets was 2.5 times or more. In the cone shape range, the SMD and SMD distribution according to the applied voltage confirmed that the droplet size was the smallest in the middle of the cone jet mode, and the droplet distribution was also narrow. In the cone jet mode, the droplet size increased linearly with the viscosity and flow rate. In addition, the droplet distribution range was distinctive depending on the type of fluid. In the case of the relationship between the droplet size and current, it was proven that the higher the viscosity, the higher the current value for the same SMD; furthermore, the difference in the current-SMD increase rate was insignificant. Through experiments, this work presents experimental data of SMD, SMD distribution, and current-SMD in electrostatic spray experiments under various conditions.
静电喷涂是一种利用高电压作为雾化辅助装置来雾化流体的方法，根据实验参数和粘度存在多种喷涂模式。根据施加电压和流速的变化，最多可识别出11种喷涂模式。为了产生细小且尺寸均匀的液滴，这是静电喷涂的优点，在本实验中，对静电喷涂的每种喷涂模式下的索特平均直径（SMD）和SMD分布进行了评估。通过将其他喷涂模式与锥射流模式进行比较，证实SMD的最大差异小于1.5倍，旋转射流和脉冲射流的标准偏差为2.5倍或更大。在锥形范围内，根据施加电压的SMD和SMD分布证实，在锥射流模式的中间液滴尺寸最小，且液滴分布也较窄。在锥射流模式下，液滴尺寸随粘度和流速呈线性增加。此外，液滴分布范围因流体类型而异。在液滴尺寸与电流的关系方面，已证明对于相同的SMD，粘度越高，电流值越高；此外，电流 - SMD增加率的差异不显著。通过实验，这项工作给出了各种条件下静电喷涂实验中SMD、SMD分布和电流 - SMD的实验数据。
