Wicking of a liquid bridge connected to a  moving porous surface

Gat, Amir D.; Navaz, Homayun K.; Gharib, Morteza

doi:10.1017/jfm.2012.218

Cited by 10 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…μ is the viscosity and σ is the surface tension. The momentum equation in radial direction can be used to conclude this . This is negligible compared to the magnitude of time required for liquid to penetrate the porous medium, that is,

O true(r_{o}^{2} μ / σ \sqrt{k} true)

with K being the permeability.…”

Section: Modelmentioning

confidence: 99%

Contact dynamic modeling of a liquid droplet between two approaching porous materials

et al. 2014

View full text Add to dashboard Cite

A computational fluid dynamics model based on a finite difference solution to mass and momentum conservation equations (Navier–Stokes equations) for a liquid droplet transport between two porous or nonporous contacting surfaces (CSs) is developed. The CS dynamic (equation of motion) and the spread of the incompressible liquid available on the primary surface for transfer are coupled with the Navier–Stokes equations. The topologies of the spread dynamic between and inside both surfaces (primary and CSs) are compared with experimental data. The amount of mass being transferred into the CS, predicted by the model, is also compared to the experimental measurements. The impact of the initial velocity on the spread topology and mass transfer into the pores is addressed. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2346–2353, 2014

show abstract

O true(r_{o}^{2} μ / σ \sqrt{k} true)

with K being the permeability.…”

Section: Modelmentioning

confidence: 99%

Contact dynamic modeling of a liquid droplet between two approaching porous materials

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Droplet transfer is typically achieved by lowering the upper substrate onto the top of the droplet to form a bridge and subsequently raising the upper substrate. In some cases, the upper substrate is slowly raised to stretch the bridge quasi-statically (Chen, Amirfazli & Tang 2013), whereas in other cases the liquid bridge is stretched with an appreciable inertial force (Gat, Navaz & Gharib 2012; Chen, Tang & Amirfazli 2015). If the wettabilities of the substrates are the same, droplet transfer is limited to approximately 50 % of the droplet's volume (Chen, Tang & Amirfazli 2014).…”

Section: Introductionmentioning

confidence: 99%

Bridging-droplet transfer from solid to porous surfaces

Murphy

Boreyko²

2022

J. Fluid Mech.

View full text Add to dashboard Cite

When the top of a sessile droplet is contacted by an opposing solid surface, the droplet can transfer depending on the wettabilities and relative velocity of the surfaces. What if the surface receiving the liquid was porous? High-speed imaging was used to capture the transfer of a droplet from a solid substrate to an opposing porous surface. The parameters that were varied include the wettability of the donor substrate, the pore size of the receiving surface and the droplet's volume and working fluid. Generally, the transfer process is split into two sequential regimes, wetting and wicking, with wicking being three orders of magnitude longer than wetting on average. The wetting regime is split into two sub-regimes, the donor-independent and donor-dependent regimes. The donor-independent regime follows the dynamics of droplet coalescence, starting in a mass-limited viscous regime followed by a capillary–inertial regime. The donor-dependent regime is driven by a global change in Laplace pressure across the liquid bridge, with the viscous wedge of the receding contact line being the rate-limiting factor. The wicking regime is governed by Darcy's law, completing the transfer process of the droplet.

show abstract

“…The dredged silt is taken as waste until it can be transported without being easily leaked/spilled out of containers, and utilized as a valuable material without pollution [2]. It is difficult for pore liquid of silt to migrate outward [3][4][5], and the natural settling process without the aid of artificial treatment may last for years. This is because the initial water content of dredged silt is exceptionally high, yet the permeability of the dredged silt is very poor.…”

Section: Introductionmentioning

confidence: 99%

Application of ultrasound to enhance the silt drying process: An experimental study

Guo

Gan

2020

PLoS ONE

View full text Add to dashboard Cite

Scientific and reasonable treatment of dredged silt can not only protect the ecological environment but also play an essential role in the utilization of silt resources. Due to high water content, low permeability and high organic matter content of the silt, a large amount of bacteria and harmful gases are often produced during the process of silt sedimentation. Thermal drying has been taken as a technically attractive method for harmless treatment of contaminated dredged silt. In this study, ultrasound technology is introduced to shorten the time needed for silt drying. A preliminary laboratory study is carried out to assess the effectiveness of ultrasound on thermal drying. A series of thermal drying tests, with and without ultrasound, were conducted on kaolin soil specimens that were prepared by settling and selfweight consolidation. The test results show that the length of drying time can be shortened by increasing temperature and ultrasound power. The drying time plays a dominant role in the determination of the total energy consumption. This is because reduction of drying time leads to significant decrease in energy consumption for thermal drying, and the energy consumption for additional ultrasound is relatively marginal. For thermal drying at temperatures 60 and 100˚C, when combined with 100 W ultrasound, the length of drying time was shortened by 44.19% and 45.16%, and the energy consumption was saved by 30.07% and 38.16%, respectively; when combined with 60 W ultrasound, the length of drying time was shortened by 4.65% and 6.45%, but the energy consumption was increased by 9.79% and 0.48%, respectively. The combination of thermal drying and 100 W ultrasound is found to be optimal in terms of drying rate and energy consumption for silt drying.

show abstract

Wicking of a liquid bridge connected to a moving porous surface

Cited by 10 publications

References 18 publications

Contact dynamic modeling of a liquid droplet between two approaching porous materials

Contact dynamic modeling of a liquid droplet between two approaching porous materials

Bridging-droplet transfer from solid to porous surfaces

Application of ultrasound to enhance the silt drying process: An experimental study

Contact Info

Product

Resources

About