液滴撞击固体表面动力学的实验研究

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
Jiangfeng Li, Chen Zhao, Chengyao Wang
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引用次数: 0

摘要

通过实验可视化研究了不同粘度的水、无水乙醇和低表面能液滴对疏水表面的冲击动力学行为。通过瞬态扩散因子和最大扩散直径对液滴的扩散、回弹和振荡收缩等冲击行为进行了观察和定量表征。探讨和分析了液滴撞击速度、表面润湿性和液滴粘度对撞击动力学的影响。随着液滴撞击速度的增大,液滴动能增大,导致扩散系数和扩散速度同时增大。疏水表面由于表面能低,不易被水滴润湿,导致水滴撞击疏水表面时发生部分回弹。然而,当低表面能的液滴,如无水乙醇和西甲硅氧烷,以相同的速度撞击疏水表面时,就不会出现这种现象。液滴粘度的增加增强了黏性耗散,减缓了冲击过程,抑制了液滴的扩散、振荡和收缩行为。基于能量守恒法,建立了不同粘度低表面能液滴对疏水表面影响的最大扩散因子的通用模型。根据实验结果,提出了一种新的扩散时间模型tm = 2D0/U0,提高了模型对高粘度低表面能液滴的适用性,将计算误差降低到10%以下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental study on the dynamics of droplet impacting on solid surface

Experimental study on the dynamics of droplet impacting on solid surface

An experimental visualization is undertaken to investigate the impact dynamic behaviors of water, absolute ethanol, and low surface energy droplets with different viscosities impacting on hydrophobic surfaces. Droplets’ impacting behaviors, including spreading, rebounding, and oscillation retraction, are observed and quantitatively characterized by transient spreading factor and maximum spreading diameter. Effects of droplet impact velocity, surface wettability, and droplet viscosity on the impact dynamics are explored and analyzed. As the droplet impact velocity increases, the droplet kinetic energy increases, resulting in an increase in the spreading factor and spreading velocity simultaneously. Hydrophobic surfaces are not easy to be wetted by water droplets due to their low surface energy, leading to the partial rebound of water droplets when impacting on the hydrophobic surfaces. However, this phenomenon does not occur when low surface energy droplets, such as absolute ethanol and simethicone, impact on hydrophobic surfaces at the same velocity. The increasing droplet viscosity enhances the viscous dissipation, slowing down the impact process and inhibiting the droplet spreading, oscillation, and retraction behaviors. Based on the energy conservation method, a universal model for the maximum spreading factor of low surface energy droplets with different viscosities impacting on hydrophobic surface was established. According to the experimental results, a new spreading time model tm = 2D0/U0 was proposed to enhance applicability of the model for low surface energy droplets with high viscosity, reducing the calculation error to less than 10%.

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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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