Velocity and Deformation Measurement of Liquid Sheet using Laser Tagging Method
Velocity and Deformation Measurement of Liquid Sheet using Laser Tagging Method
复制标题
激光标记法测量液体层的速度和变形
DOI：
10.1007/s00348-014-1843-0
复制
发表时间：
2014
影响因子：
2.4
通讯作者：
Kenji Amagai
中科院分区：
文献类型：
--
作者：
Nurrina Binti Rosli;Kenji Amagai
液体雾化系统作为一种重要的工艺过程在工业生产中得到了广泛的应用。在内燃机中，燃烧现象受到由雾化过程给出的燃料的喷雾特性的强烈影响。为了全面了解整个雾化过程，需要详细研究液体射流特性与破碎现象之间的关系。本研究发展了一种非侵入式的光致变色染料激光标记法，旨在详细研究液膜的破碎过程，涵盖了从膜中的行为直到破碎成韧带和液滴的过程。光致变色染料的激光标记方法是基于紫外激光标记的光致变色染料分子的吸收光谱的位移。该偏移导致在含有染料的液体的标记区域处的颜色变化。在这项研究中，染料痕迹的运动被分析为液体表面速度。结果表明，液膜的速度在膜内基本保持不变，在断点附近突然增大。但破碎成液滴后又减少了。通过在液体片上形成一组四点染料迹线，该组的相对位置的变化使得能够测量液体片的变形和旋转运动。结果表明，平行于流动方向的液膜法向应变取决于韧带形成的流动行为。
Liquid atomization system has been extensively applied as the most significant process in many industrial fields. In the internal combustion engine, the combustion phenomenon is strongly influenced by the spray characteristics of the fuel given by the atomization process. In order to completely understand the whole atomization process, a detail investigation of relations between the liquid jet characteristics and the breakup phenomenon is required. In this study, a non-intrusive method called as laser tagging method by photochromic dye has been developed with aim to study the breakup process of liquid sheet in detail, covering from the behavior in film until disintegrated into ligament and droplets. The laser tagging method by photochromic dye is based on a shift in the absorption spectrum of photochromic dye molecules tagged by ultraviolet laser. The shift results a color change at the tagged region of liquid containing the dye. In this study, the motions of the dye traces were analyzed as the liquid surface velocity. As a result, liquid sheet was found to keep its velocity constantly in film before suddenly increase around broken point. However, it then decreased after broken into droplets. By forming a set of four points of dye traces on the liquid sheet, the change of relative position of the set enabled the measurement of deformation and rotational motion of the liquid sheet. As a result, the normal strain of the liquid sheet parallel to the flow direction depended on the flow behavior of ligament formation.