Controlled cavity collapse: scaling laws of drop formation.
Controlled cavity collapse: scaling laws of drop formation.
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DOI：
10.1039/c8sm00114f
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发表时间：
2018-09
期刊：
影响因子：
3.4
通讯作者：
A. Ismail;A. Gañán-Calvo;J. Castrejón-Pita;M. Herrada;A. A. Castrejón-Pita-A.
中科院分区：
文献类型：
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作者：
A. Ismail;A. Gañán-Calvo;J. Castrejón-Pita;M. Herrada;A. A. Castrejón-Pita-A.
液体界面瞬态空腔的形成存在于各种各样的自然过程中，其中表面气泡的破裂和液滴对液池的冲击是最显著的。表面液体空腔的塌陷是一个有充分记录的自然过程，它导致喷射出薄而快的射流。通过这个过程产生的液滴可以比腔的孔径小一个数量级，因此它们在按需喷墨应用中很有意义。在这项工作中，分析了受控的液体腔的形成和崩溃，并确定了最小化产生的尺寸和喷射滴数的条件。实验和数值模型都很简单，包括一个储液器、一个带排出孔的喷嘴板和一个由单个半正弦拉模脉冲驱动的运动活塞。喷射液滴的大小由一个物理模型描述，由此产生的标度定律得到了数值和实验的验证。
The formation of transient cavities at liquid interfaces occurs in an immense variety of natural processes, among which the bursting of surface bubbles and the impact of a drop on a liquid pool are salient. The collapse of a surface liquid cavity is a well documented natural process that leads to the ejection of a thin and fast jet. Droplets generated through this process can be one order of magnitude smaller than the cavity's aperture, and they are consequently of interest in drop on demand inkjet applications. In this work, the controlled formation and collapse of a liquid cavity is analyzed, and the conditions for minimizing the resulting size and number of ejected drops are determined. The experimental and numerical models are simple and consist of a liquid reservoir, a nozzle plate with the discharge orifice, and a moving piston actuated by single half-sine-shaped pull-mode pulses. The size of the jetted droplet is described by a physical model resulting in a scaling law that is numerically and experimentally validated.