Contact line dynamics of gravity driven spreading of liquids

Karim, Alireza Mohammad; Fujii, Kenichi; Kavehpour, H. Pirouz

doi:10.1088/1873-7005/abfaf1

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…The governing physical forces are interfacial tensions, gravity and viscosity. 17,55–57,124,148,204,211,221,250–276 Figure 6 illustrates the stationary condition of a droplet on a soft (flexible) substrate with interfacial tensions acting along the interfaces due to deformation of the soft substrate via impact of the droplet.…”

Section: Forces and Non-dimensional Parameters In Physics Of Droplet ...mentioning

confidence: 99%

Physics of droplet impact on flexible materials: A review

Karim

2022

Advances in Mechanical Engineering

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Droplet impact on a flexible substrate is a prevalent phenomenon in nature and various advanced technologies such as soft bio-printing, tissue engineering, smart biomaterials and flexible electronics. Recent rapid advancement in new functional surfaces, ultra-high-speed imaging, nanotechnology, deep learning, advanced computational strength and the relation between fluid dynamics and interfacial science have intensified the physical understanding of droplet impact on soft materials. Once a droplets impacts on a solid surface, it deposits, spreads, rebounds or splashes. Given the importance of the droplet impact onto soft substrates in biotechnology, medicine and advanced flexible electronics, a deep physical understanding of such complex phenomenon is vital. This review initially presents the liquid-solid interaction physics and relevant interfacial science. Next, this review discusses the physics of droplet impact on soft materials with different physical and interfacial characteristics. Moreover, this review presents advancements in droplet impact on elastic materials relevant to new technologies such as soft electronics, elastic smart biomaterials, tissue engineering and the fight against COVID-19 pandemic. Finally, this review lays out future research directions related to current problems in such complex physical phenomenon.

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Section: Forces and Non-dimensional Parameters In Physics Of Droplet ...mentioning

confidence: 99%

Physics of droplet impact on flexible materials: A review

Karim

2022

Advances in Mechanical Engineering

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“…Molecular kinetic theory is normally applied for a dynamic contact line with large contact angles. Molecular kinetic theory was reported to be appropriate for explaining the physics of forced movement of the dynamic contact line on rough substrates and smooth inclined substrates [55,[155][156][157][158]. Molecular kinetic theory was also shown to be a promising model for describing the physics of the dynamic contact line in the area of electrowetting and cell-adhesion problems [50,124,154].…”

Section: Molecular Kinetic Theory: Advantages and Limitationsmentioning

confidence: 99%

Physics of Dynamic Contact Line: Hydrodynamics Theory versus Molecular Kinetic Theory

Karim

Suszynski

2022

Fluids

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The dynamic contact line plays a key role in various fields of interfacial physics, including bioprinting, nano-scale printing, three-dimensional printing, biomaterials, tissue engineering, smart materials, flexible printed electronics, biomedicine, and healthcare. However, there is still a lack of thorough physical understanding of its real behavior in numerous complex problems in nature and technology. The dynamic contact line exhibits a complex conformation in real-life fluid dynamics problems. Therefore, this review presents two main long-standing models that describe the physics of the dynamic contact line: hydrodynamics theory and molecular kinetics theory. Next, the role of the dynamic contact line in current advanced technologies is discussed. Finally, this review discusses future research directions to enhance the power of current physical models of the dynamic contact line.

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“…The main approaches for the modeling of the contact-line dynamics are the molecularkinetic 19,20 and hydrodynamic 21,22 theories with former focusing on the dissipation at the intermolecular length-scale and latter treating the movement of the contact-line at the continuumlevel. Nevertheless, recent studies 23,24 have revealed that the improved results are obtained when using a combination 25 of these two approaches.…”

Section: Introductionmentioning

confidence: 99%

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

2021

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This work focuses on three-dimensional simulation of the dynamics of droplets with contact-angle hysteresis. In order to consistently model the dynamics of the contact line, a combination of the linear molecular kinetic theory and the hydrodynamic theory is implemented in the present numerical method. Without presetting the contact line and/or the contact angle, such simulations are generally prone to irregularities at the contact line, which are mainly due to the imposition of the pinning and unpinning mechanisms associated with the hysteresis phenomenon. An effective treatment for this issue is proposed based on a simple procedure for calculating the nodal contact angle within the framework of enriched finite element/level set method. The resulting method also benefits from a manipulated momentum conservation equation that incorporates the effect of the liquid mass conservation correction, which is essentially important for simulations with a rather long (physical) run-time. In this paper, the proposed numerical model is validated against the previously published experimental data addressing the configuration of a water droplet on a tilted rough hydrophobic surface. In this test, the effect of the contact-line pinning as the underlying mechanism for droplet hysteresis phenomenon is also studied. The model is further employed to simulate a liquid droplet confined in a channel in the presence of air flow.

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Contact line dynamics of gravity driven spreading of liquids

Cited by 10 publications

References 41 publications

Physics of droplet impact on flexible materials: A review

Physics of droplet impact on flexible materials: A review

Physics of Dynamic Contact Line: Hydrodynamics Theory versus Molecular Kinetic Theory

Toward droplet dynamics simulation in polymer electrolyte membrane fuel cells: Three-dimensional numerical modeling of confined water droplets with dynamic contact angle and hysteresis

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