超声作用下圆板表面液滴铺展雾化特性  

Characteristics of Droplet Spreading and Atomizing on Circular Plate under Ultrasonic Excitation

作　　者：李帅[1] 李栋[1,2,3] 赵孝保 LI Shuai;LI Dong;ZHAO Xiao-Bao(School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210046,China;Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province,Nanjing 210046,China;School of Chemistry and Material Science,Nanjing Normal University,Nanjing 210046,China)

机构地区：[1]南京师范大学能源与机械工程学院,南京210046 [2]江苏省能源系统过程转化与减排技术工程实验室,南京210046 [3]南京师范大学化学与材料科学学院,南京210046

出　　处：《工程热物理学报》2021年第3期676-679,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52006107);中国博士后基金61批面上项目(No.2017M611857)。

摘　　要：对超声激励下圆板表面液滴铺展及雾化行为进行了可视化观测并基于ANSYS Workbench对超声激励下平板表面等效应力分布进行数值模拟,结合等效应力分布特性分析了不同位置液滴雾化行为差异并归纳总结了液滴铺展雾化的三种典型行为,研究结果表明:超声作用可使圆板表面液滴瞬间雾化且表面会形成与应力分布相一致的间隔交替的"雾化环带"和"微滴环带";液滴总是向着等效应力增加的方向铺展雾化;液滴在圆板上的铺展雾化行为包括单侧铺展雾化、两侧同时铺展雾化以及整体均匀雾化三种类型且雾化类型与所处位置等效应力梯度有关。The visual observation of droplets spreading and atomizing on the surface of circular plate under ultrasonic excitation was carried out and the equivalent stress distribution on the surface of plate under ultrasonic excitation was analyzed numerically based on ANSYS Workbench.Based on the characteristics of equivalent stress distribution,the atomizing behaviors of droplets at different positions were analyzed,and three typical behaviors of droplet spreading and atomizing were summarized.The following conclusions were obtained:droplets on the surface of the circular plate can be atomized instantaneously under ultrasonic excitation and alternate"atomizing annulus"and"micro droplets annulus"will be formed on the surface which are consistent with the stress distribution;droplets always spread into the direction of higher equivalent stress;the spreading and atomizing behavior of droplets on circular plate includes three types:one-side spreading atomizing,simultaneous spreading atomizing on both sides and overall uniform atomizing,and the type of which is related to the equivalent stress gradient.

关 键 词：超声波 谐响应 微滴环带 铺展雾化 等效应力分布 

分 类 号：TK121[动力工程及工程热物理—工程热物理]