Dynamic behavior of micrometric single water droplets impacting onto heated surfaces with TiO2 hydrophilic coating
Dynamic behavior of micrometric single water droplets impacting onto heated surfaces with TiO2 hydrophilic coating
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DOI：
10.1016/j.ijthermalsci.2013.12.011
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发表时间：
2014-05
影响因子：
4.5
通讯作者：
E. Negeed;M. Al-Beirutty;Y. Takata
中科院分区：
文献类型：
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作者：
E. Negeed;M. Al-Beirutty;Y. Takata
利用高速摄像机研究了微尺度单水滴在有和没有超亲水性涂层的受热表面上的动力学行为。超亲水性表面涂层（SHS）是通过在表面涂覆二氧化钛（TiO2）并将表面暴露在紫外线（UV）下实现的。考虑了不同金属的镜面传热表面。实验运行是通过将单个水滴喷射到加热表面上进行的，水滴的直径和速度是独立控制的。用高速摄像机观察了液滴与热表面碰撞过程中的行为。通过对实验结果的分析，并与其他研究者的结果进行对比，研究了表面润湿性、传热表面热性能、液滴速度、液滴尺寸和表面过热度对微尺度单水滴撞击受热表面动力学行为的影响。用经验关系式描述了单个液滴撞击受热表面的流体动力特性，并隐藏了这一过程中的影响参数。
Dynamic behavior of micrometric single water droplets impacting onto heated surfaces with and without superhydrophilic coating is investigated using a high-speed video camera in this research study. Superhydrophilic surface coating, SHS, is achieved by coating the surface with Titanium dioxide, TiO2, and by exposing the surface to ultraviolet, UV. Mirror heat transfer surfaces of different metals have been considered. The experimental runs are carried out by spraying single water droplets onto heated surfaces where, the droplet diameter and velocity were independently controlled. The droplet behavior during the collision with the hot surface has been observed with the high-speed video camera. By analyzing the experimental results and comparison between the present results and the results due to other investigators, the effects of surface wettability, thermal properties of the heat transfer surface, droplet velocity, droplet size and surface superheat on the dynamic behavior of micrometric single water droplets impacting onto the heated surfaces were investigated. Empirical correlations are presented describing the hydrodynamic characteristics of an individual droplet impinging onto the heated surfaces, and concealing the affecting parameters in such process.