Impact of drops of a nanoparticle dispersion in a viscoelastic liquid

IF 2.7 2区工程技术 Q2 MECHANICS

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2024-03-22 DOI:10.1016/j.jnnfm.2024.105221

Takshak Shende, Ian Eames, Mohammad Hadi Esteki, Yousef Javanmardi, Emad Moeendarbary

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Abstract

The evaluation of nanoparticle dispersion within viscoelastic fluids upon impact on hydrophobic and hydrophilic surfaces is conducted using the Euler-Lagrangian technique. The volume-of-fluid approach is employed in conjunction with the Lagrangian method to model the transport of nanoparticles in a three-phase system (particles-air-viscoelastic fluid). The assessment of nanoparticle dispersion was conducted over a range of Péclet numbers and contact angles ( $θ = 30 °$ and $120 °$ ) in three-dimensional (3D) space using the mean square displacement method. The findings suggest that the dispersion of nanoparticles is mainly influenced by normal stress. During droplet impact, nanoparticles exhibit non-Fickian superdiffusive behaviour due to the viscoelastic fluid’s non-Gaussian distribution of velocity and stresses (normal and shear) fields. The wettability of the fluid with solid surfaces substantially affected the dispersion of nanoparticles in the viscoelastic fluid.

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粘弹性液体中纳米粒子分散液滴的影响

使用欧拉-拉格朗日技术评估了纳米粒子撞击疏水和亲水表面时在粘弹性流体中的分散情况。流体体积法与拉格朗日法相结合，用于模拟三相系统（颗粒-空气-粘弹性流体）中纳米颗粒的传输。利用均方位移法，在三维空间的佩克莱特数和接触角（θ=30°和120°）范围内对纳米粒子的分散进行了评估。研究结果表明，纳米粒子的分散主要受到法向应力的影响。在液滴撞击过程中，由于粘弹性流体的速度和应力（法向和剪切）场的非高斯分布，纳米粒子表现出非费克超扩散行为。流体与固体表面的润湿性极大地影响了纳米粒子在粘弹性流体中的分散。

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来源期刊

Journal of Non-Newtonian Fluid Mechanics 物理-力学

CiteScore

5.00

自引率

19.40%

发文量

109

审稿时长

61 days

期刊介绍： The Journal of Non-Newtonian Fluid Mechanics publishes research on flowing soft matter systems. Submissions in all areas of flowing complex fluids are welcomed, including polymer melts and solutions, suspensions, colloids, surfactant solutions, biological fluids, gels, liquid crystals and granular materials. Flow problems relevant to microfluidics, lab-on-a-chip, nanofluidics, biological flows, geophysical flows, industrial processes and other applications are of interest. Subjects considered suitable for the journal include the following (not necessarily in order of importance): Theoretical, computational and experimental studies of naturally or technologically relevant flow problems where the non-Newtonian nature of the fluid is important in determining the character of the flow. We seek in particular studies that lend mechanistic insight into flow behavior in complex fluids or highlight flow phenomena unique to complex fluids. Examples include Instabilities, unsteady and turbulent or chaotic flow characteristics in non-Newtonian fluids, Multiphase flows involving complex fluids, Problems involving transport phenomena such as heat and mass transfer and mixing, to the extent that the non-Newtonian flow behavior is central to the transport phenomena, Novel flow situations that suggest the need for further theoretical study, Practical situations of flow that are in need of systematic theoretical and experimental research. Such issues and developments commonly arise, for example, in the polymer processing, petroleum, pharmaceutical, biomedical and consumer product industries.