Kamamoto Kyota, Kiyama Akihito, Tagawa Yoshiyuki, Zhang Xuehua
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Naka-cho 2-24-16, Koganei, Tokyo 184-8588, Japan.
Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Naka-cho 2-24-16, Koganei, Tokyo 184-8588, Japan.
Langmuir. 2021 Feb 16;37(6):2056-2064. doi: 10.1021/acs.langmuir.0c01692. Epub 2021 Feb 2.
We investigated the dynamics of a liquid column consisting of ouzo emulsion under the impact generated when the liquid container lands on a hard ground. At a cavitation number of 0.36, where cavitation is expected to occur, our high-speed videography captured the traveling jet and cavitation bubbles while the oil microdroplets in ouzo after different runs of impact were visualized by an optical microscope. Importantly, the impact on an ouzo column can eject a focused jet of the emulsion and deposit a small volume of emulsion on a solid substrate. As revealed by our still photography, the deposited emulsion formed an oil-lubricated drop immediately. Our findings have implications for jetting applications such as inkjet printing of emulsions or fast deposition of self-lubricating drops for assembling supraparticles. We also discuss the jet formation mechanism in terms of the existence of oil microdroplets.
我们研究了在液体容器落在坚硬地面时产生的冲击下，由茴香酒乳液组成的液柱的动力学特性。在空化数为0.36（预计会发生空化的情况下），我们的高速摄像捕捉到了行进的射流和空化气泡，同时通过光学显微镜观察了不同冲击次数后茴香酒中的油微滴。重要的是，对茴香酒柱的冲击可以喷射出聚焦的乳液射流，并在固体基板上沉积少量乳液。正如我们的静态摄影所显示的，沉积的乳液立即形成了一个油润滑的液滴。我们的研究结果对诸如乳液喷墨打印或用于组装超颗粒的自润滑液滴的快速沉积等喷射应用具有启示意义。我们还根据油微滴的存在讨论了射流形成机制。
