Marangoni-driven instability patterns of an <i>N</i>-hexadecane drop triggered by assistant solvent

Zhao, Wei; Ma, Hongzhi; Ji, Wenjie; Li, Weibin; Wang, Jin; Yuan, Quanzi; Wang, Yuren; Ding, Lei

doi:10.1063/5.0031045

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…They found that when the concentration of aqueous IPA solution exceeded 0.35, the IPA droplets spontaneously spread and split into numerous tiny droplets. Zhao et al [5] observed n-hexadecane droplets spreading on the aqueous substrates with different surface tensions, and the results showed that there existed two instability modes, which were caused by the Marangoni effect. Woodley et al [6] investigated the dichloromethane droplets spreading on an aqueous substrate, then a unique highly ordered pattern was formed.…”

Section: Introductionmentioning

confidence: 99%

Spreading Characteristics of Volatile Liquid Film on the Liquid-solid Substrates

Yan

Chen

2023

J. Phys.: Conf. Ser.

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The spreading characteristics of volatile liquid film on the liquid-solid substrate have been experimentally investigated. Unlike the liquid film spreading on the liquid substrate, there exists a dip at the top of the solid substrate, as a result, the spreading behaviors are inhibited. It is found that dip characteristics of R’/ R slightly decrease at the beginning then it keeps constant R’/ R=0.83 until the end. Moreover, the comparison of spreading behaviors on two different substrates is investigated. When the volatile film spreads on the liquid-solid substrate, the maximum radii of the outer and inner rings are smaller, but the process lasts longer. Although the evolutions of radii are different, the variation trend of nondimensional ring width is consistent. We further study the spreading rate; results show there exist three stages due to the relative importance of different forces. Our results provide important missing pieces to the rich mechanisms of the multiple-phase flow driven by the Marangoni effect.

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Section: Introductionmentioning

confidence: 99%

Spreading Characteristics of Volatile Liquid Film on the Liquid-solid Substrates

Yan

Chen

2023

J. Phys.: Conf. Ser.

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Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Huang

et al. 2023

J. Fluid Mech.

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Marangoni spreading on thin films is widely observed in nature and applied in industry. It has serious implications for airway drug delivery, especially in surfactant displacement therapy. This paper reports the results of experimental investigations of a surfactant-laden droplet spreading on films made of more viscous Newtonian fluids as well as on films made of viscoelastic fluids. The experiments used particle seeding, the transmission-speckle method and particle tracking velocimetry (PTV) to determine the deformation of the film–droplet interface and to measure velocity fields. Radially aligned patterns were observed on Newtonian films. Similar patterns, but with much smaller wavenumber, were observed on viscoelastic films in combination with rapid azimuthal variations of the film thickness. The Saffman–Taylor instability at the film–droplet interface explains the formation of patterns on a more viscous Newtonian film, and their onset requires exceeding the critical capillary number. The pattern formation on viscoelastic films is correlated with an instability at the film–droplet–air contact line when the liquid is expelled radially by the spreading droplet. PTV revealed azimuthal variations of the velocity field in the vicinity of the contact line. The observed contact line instability is different from previously reported fingering instabilities of Newtonian thin films. A simple scaling law accounting for the Marangoni-stress-induced elastic shear deformation is proposed to describe the flow field in the patterns formed in the viscoelastic films.

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An energy-conservative many-body dissipative particle dynamics model for thermocapillary drop motion

Zhang

Fang

et al. 2022

Physics of Fluids

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The thermocapillary motion of a drop on a solid substrate is a common phenomenon in daily life and many industrial fields. The motion can be significantly affected by the temperature gradient of the substrate and the properties of the liquid, such as surface tension, viscosity, thermal coefficient, density, and diffusivity. In this study, a numerical model based on modified many-body dissipative particle dynamics was developed to capture correctly the temperature-dependence of a fluid. The momentum, thermal diffusivity, viscosity, and surface tension of liquid water at various temperatures ranging from 273 to 373 K were used as examples to verify the proposed model. The results calculated with this model for heat conduction in a liquid-solid system are in good agreement with those calculated with Fourier's law. The approach successfully modeled the thermocapillary motion of a liquid water droplet on a hydrophobic substrate with a temperature gradient. The migration of the droplet on a flat solid substrate was induced by the difference in surface tension due to the temperature gradient. The migration velocity increased with the temperature difference, which is in agreement with the present theoretical analysis and dynamic van der Waals theory. The modified numerical model proposed in this work could be used to study heat and mass transfer across a free interface, such as Marangoni convection in multiphase fluid flow.

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Marangoni-driven instability patterns of an N-hexadecane drop triggered by assistant solvent

Cited by 5 publications

References 37 publications

Spreading Characteristics of Volatile Liquid Film on the Liquid-solid Substrates

Spreading Characteristics of Volatile Liquid Film on the Liquid-solid Substrates

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

An energy-conservative many-body dissipative particle dynamics model for thermocapillary drop motion

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