探索表面张力测量中的液滴振荡动力学

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Kiana Fahimi, Lutz Mädler, Nils Ellendt
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引用次数: 0

摘要

本研究在先前研究的基础上,利用按需滴高温液滴发生器探索液滴振荡动力学,以确定表面张力。研究人员进行了计算流体动力学(CFD)模拟,以分析随时间变化的频率偏移,并对两种不同材料进行了比较,结果一致。研究结果表明,有可能为初始变形较大的振荡开发校正因子。此外,还比较了与初始变形较大的液滴的长宽比变化有关的频率偏移。可以采用校正措施,尤其有利于基于图像分析的短期测量,使整体频率偏移最小。随着长宽比的增加,振荡略有不对称,这可能与液滴横截面的几何形状有关,也可能与液滴的能量可用性有关,因为能量可用性可使凸形液滴恢复到球形状态。实验结果表明,在长达 40 毫秒的测量持续时间内,频率偏移极小,这证明使用拟合正弦函数而不使用随时间变化的频率项来确定总体频率是合适的。无量纲标准可用于过滤不合适的液滴。介绍了 AlCu10 合金随温度变化的表面张力趋势,与文献结论一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring droplet oscillation dynamics in surface tension measurements

This study builds upon prior research by exploring droplet oscillation dynamics for surface tension determination using a drop-on-demand high-temperature droplet generator. Computational fluid dynamics (CFD) simulations were conducted to analyse frequency shifts over time, comparing two different materials with consistent results. The findings suggest potential for developing correction factors for oscillations with larger initial deformations. Additionally, frequency shifts relative to evolving aspect ratios of droplets starting with higher initial deformations were compared. Corrective measures can be applied, particularly beneficial for short-term measurements based on image analysis with minimal overall frequency shift. Slight asymmetry in oscillation with increasing aspect ratio could be accredited to droplet cross-sectional geometry or energy availability for returning prolate droplets to a spherical state. Experimental results indicated minimal frequency shift within a measurement duration of up to 40 ms, affirming the adequacy of using a fitted sine function without a time-dependent frequency term for overall frequency determination. A dimensionless criterion can be used to filter out unsuitable droplets. A temperature-dependent surface tension trend for AlCu10 alloy consistent with literature findings is introduced.

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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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