Liquid film burst caused by perpendicularly blowing gas jet

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Shangning Wang, Yilong Li, Yijia Zhang, Shuyi Qiu, Xuesong Li, Min Xu
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引用次数: 0

Abstract

Blowing gas perpendicularly onto a liquid film may lead to various kinds of film deformations. When the jet is steady and mild, a protrusion structure will appear on the film and stretches in length, as jet velocity continue to increase, separated bubbles will detach from the protruded surface. Compared with continuously blowing gentle gas jets, short duration pulsed strong jets are more realistic and generally existing, yet the in-depth mechanism studies are insufficient, thus need further investigation. We have observed that the liquid film protrusion tends to stretch to a critical length then burst into tiny droplets when blown by the pulsed jet. After theoretical analysis, we discover that during the stretching process, rather than the jet velocity that was presumed as the driving factor, the two physical properties of the fluid, namely the surface tension and viscosity, play the dominant role to cause the structure collapsing. The critical burst length of the protrusion structure correlates with the ratio of these two properties. We conducted experiments using various test fluids, gas nozzle diameters, and jet velocities. The experimental results confirmed our theoretical analysis. This discovery provides a critical insight into the physics of liquid film deformation and atomization under gaseous crossflow, which can be commonly seen in fuel injection and aerosol droplet generation related fields.

垂直喷射气体造成的液膜爆裂
垂直向液膜喷射气体会导致液膜产生各种变形。当喷射稳定且温和时,薄膜上会出现突起结构并拉伸长度,随着喷射速度的不断增加,分离的气泡会从突起表面脱离。与连续吹出的温和气体射流相比,短时脉冲强射流更为真实,也更普遍存在,但深入的机理研究还不够,需要进一步研究。我们观察到,在脉冲射流的吹拂下,液膜突起往往会拉伸到临界长度,然后爆裂成小液滴。经过理论分析,我们发现在拉伸过程中,流体的两种物理特性,即表面张力和粘度,而不是推测的射流速度作为驱动因素,起着主导作用,导致结构坍塌。突起结构的临界爆破长度与这两种属性的比率相关。我们使用不同的测试流体、气体喷嘴直径和喷射速度进行了实验。实验结果证实了我们的理论分析。这一发现为气态横流条件下的液膜变形和雾化物理学提供了重要的启示,这种情况在燃料喷射和气溶胶液滴生成相关领域非常常见。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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