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Focal Plane Shift Imaging for the Analysis of Multi-Droplet Jumping

机译：焦平面位移成像技术用于多液滴跳跃的分析

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摘要

High speed images of coalescence induced three-droplet jumping on a nanostructured superhydrophobic carbon nanotube (CNT) surface are presented (θ_a~(app) ≈173°). When two or more droplets coalesce on a nanostructured superhydrophobic surface, the resulting droplet can jump away from the surface due to the release of excess surface energy. To more easily study the jumping phenomena, we have developed focal plane shift imaging (FPSI) to determine both jumping speed and direction. Figure l(a) shows a schematic of the FPSI concept. A high speed camera was attached to an upright optical microscope, and samples were horizontally mounted on a cold stage. Initial conditions were obtained by moving the focal plane to be coincident with the middle of the droplets prior to coalescence (Figure 1b). Then the focal plane was shifted above the droplets by a known distance (Figure lc), followed by measurement of the time taken for the jumping droplet to pass through the shifted focal plane (Figure 1d). By analyzing the initial and final conditions of the departing droplet for multiple three-droplet coalescence events, the three-droplet jumping droplet speed was determined (Figure 2b). Experimentally measured jumping speeds determined by the FPSI imaging technique show good agreement with three-droplet inertial capillary scaling (Figure 2b, dotted line, equation inset). The FPSI visualization technique provides a novel imaging platform for the study of complex multi-droplet jumping-droplet phenomena.
机译：呈现了在纳米结构的超疏水碳纳米管（CNT）表面上聚结诱导的三滴跳跃的高速图像（θ_a〜（app）≈173°）。当两个或多个液滴在纳米结构的超疏水表面上聚结时，由于释放过多的表面能，所得的液滴可能会跳离表面。为了更轻松地研究跳跃现象，我们开发了焦平面位移成像（FPSI）来确定跳跃速度和方向。图1（a）显示了FPSI概念的示意图。将高速相机连接至立式光学显微镜，并将样品水平放置在冷台上。通过移动焦平面使其与聚结之前的液滴中间重合来获得初始条件（图1b）。然后，焦平面在液滴上方移动了已知距离（图1c），然后测量跳跃液滴通过移动的焦平面所需的时间（图1d）。通过分析多个三液滴合并事件的离开液滴的初始条件和最终条件，确定了三液滴跳跃液滴的速度（图2b）。由FPSI成像技术确定的实验测量的跳跃速度与三滴惯性毛细管定标显示出良好的一致性（图2b，虚线，方程式插图）。 FPSI可视化技术为研究复杂的多液滴跳跃液滴现象提供了一个新颖的成像平台。

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  • 来源
    《Journal of Heat Transfer》 |2017年第2期|020903.1-020903.1|共1页
  • 作者

    Hyeongyun Cha; Jae Min Chun; Yuehan Xu; Nenad Miljkovic;

  • 作者单位

    Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801;

    Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801;

    Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801;

    Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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