Temporal instability and sheet breakup of a curved liquid sheet formed by jet impinging on a circular plane

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-01-15 DOI:10.1016/j.expthermflusci.2025.111411

Tianyu Kang (康天宇) , Qingbo Yu (于庆波) , Zhongyuan Liu (刘中元) , Shengkai Tao (陶盛恺)

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Abstract

For melt granulation, sheet breakup formed by melt jet impingement is an efficient treatment method. This paper theoretically and experimentally investigates the flow and breakup characteristics of a curved liquid sheet formed by jet impinging on a circular plane. The results show that the overall degree of sheet bending decreases with the increase in sheet velocity, which can be used to determine the streamline of liquid sheets by the configuration method. Based on the obtained knowledge of the sheet dynamic, the disturbance dispersion equation of a liquid sheet with variable velocity is derived first. In the instability analysis of the liquid sheet element, the acceleration force working due to the sheet bending stabilizes the sheet disturbance. However, combining the overall motion and instability of the liquid sheet shows that, with the sheet’s bending and spreading, the increasing sheet velocity and the decreasing sheet thickness still promote the development of sheet disturbance. For the dominant breakup mode, the bending of the liquid sheet contributes to the delay of sheet breakup for bell-like sheets at low velocity. In contrast, the bending of the liquid sheet contributes to the advance of sheet breakup for umbrella-like sheets at large velocity. For the critical jet Weber number, the experimental value of the curved sheet is less than that of the planar liquid sheet, due to the increase in sheet velocity. The prediction methods of breakup length and droplet radius are proposed.

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射流撞击圆形平面形成的弯曲液体片的时间不稳定性和片状破裂

对于熔体造粒，用熔体射流冲击破碎是一种有效的处理方法。本文从理论上和实验上研究了射流撞击圆形平面形成的弯曲液片的流动和破碎特性。结果表明，随着速度的增加，整体弯曲程度减小，可以用构形法确定液片的流线。在已有的液片动力学知识的基础上，首先推导了变速液片的扰动色散方程。在液片元件的失稳分析中，由于液片弯曲而产生的加速度对液片扰动起到了稳定作用。然而，结合液片的整体运动和不稳定性可知，随着液片的弯曲和展开，液片速度的增加和液片厚度的减小仍然促进了液片扰动的发展。对于主要的破裂模式，在低速下，液片的弯曲有助于延迟钟状板的破裂。而在大流速下，液片的弯曲有利于伞状片的破碎。对于临界射流韦伯数，由于液片速度的增加，弯曲液片的实验值小于平面液片的实验值。提出了破碎长度和液滴半径的预测方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.