A numerical study on the dynamic behavior of the liquid located between pillar-shaped structures

Lee, Jun; Son, Sung Wan; Ha, Man Yeong; Kim, Hyung Rak

doi:10.1007/s12206-014-0936-2

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Several other approaches have been exploited to study flows with contact line motion [23]. Recently Kim et al [24] applied a lattice Boltzmann method (LBM) to study the dynamics of a droplet on a moving wall, analyzing the effect of the wettability on the onset of the droplet pinch off. The motion onset of a drop on a homogenous plane, driven by a body force, was also investigated by Semprebon et al [25] by means of the Surface Evolver.…”

Section: Introductionmentioning

confidence: 99%

Drop motion induced by vertical vibrations

et al. 2015

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We have studied the motion of liquid drops on an inclined plate subject to vertical vibrations. The liquids comprised distilled water and different aqueous solutions of glycerol, ethanol and isopropanol spanning the range 1-39 mm 2 s −1 in kinematic viscosities and 40-72 mN m −1 in surface tension. At sufficiently low oscillating amplitudes, the drops are always pinned to the surface. Vibrating the plate above a certain amplitude yields sliding of the drop. Further increasing the oscillating amplitude drives the drop upward against gravity. In the case of the most hydrophilic aqueous solutions, this motion is not observed and the drop only slides downward. Images taken with a fast camera show that the drop profile evolves in a different way during sliding and climbing. In particular, the climbing drop experiences a much bigger variation in its profile during an oscillating period. Complementary numerical simulations of 2D drops based on a diffuse interface approach confirm the experimental findings. The overall qualitative behavior is reproduced suggesting that the contact line pinning due to contact angle hysteresis is not necessary to explain the drop climbing.

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Section: Introductionmentioning

confidence: 99%

Drop motion induced by vertical vibrations

et al. 2015

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Research on the solidified morphologies of successive pileup metal droplets

Chen

Huang

et al. 2020

J Mech Sci Technol

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Respiratory droplet resuspension near surfaces: Modeling and analysis

Nikfar

Paul

Islam

et al. 2021

Journal of Applied Physics

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Knowing the environmental spreading pathway of COVID-19 is crucial for improving safety practices, particularly for health care workers who are more susceptible to exposure. This paper focuses on the possible secondary transmission due to resuspension of virus-laden droplets from common surfaces, which several studies have shown to be possible under external disturbances. Such disturbances could be body motion during walking, running, clothes removal, or airflow in the environment. In this paper, a three-dimensional two-phase model is utilized to study respiratory droplet resuspension dynamics on various surfaces due to sudden agitation. The velocity range and variation during walking, surgical glove removal, and dropping an object are studied experimentally. A parametric study is performed to characterize the effects of droplet size and surface wettability on the minimum initial droplet velocity required for detachment from surfaces. The results are reported as average droplet velocity during the detachment process, total detachment time, and detached droplet volume. The obtained results indicate that respiratory droplets larger than 200 μm can detach from typical surfaces due to normal daily activities. Droplets are partially separated from hydrophilic surfaces with contact angle ≤90°, while the entire droplet is detached from hydrophobic surfaces with contact angle >90°. Furthermore, the minimum initial droplet velocity to induce the resuspension depends on the droplet size. Droplet velocity immediately after detachment is a function of droplet size, initial droplet velocity, and surface wettability. Bigger droplets have larger detached volume percentage as well as higher velocity after detachment compared to smaller droplets. Finally, a higher initial velocity is needed to separate droplets from hydrophilic surfaces as compared to hydrophobic surfaces. In accordance with the results, the droplet minimum initial velocity to cause detachment is 2 m s−1, while our experiments show that surface velocity can reach up to 3 m s−1 during normal human activities. We also develop an analytical model to predict the required kinetic energy to detach droplets from different surfaces, which is in good agreement with numerical results. The mechanism of droplet detachment is dictated by a competition between droplet kinetic energy induced by surface motion and surface energy due to droplet–surface interaction as well as droplet–vapor and surface–vapor interactions. We believe that the results of this fundamental study can potentially be used to suggest proper surface wettability and safe motion that reduce respiratory droplet resuspension from various surfaces.

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A numerical study on the dynamic behavior of the liquid located between pillar-shaped structures

Cited by 3 publications

References 17 publications

Drop motion induced by vertical vibrations

Drop motion induced by vertical vibrations

Research on the solidified morphologies of successive pileup metal droplets

Respiratory droplet resuspension near surfaces: Modeling and analysis

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