Rotating Surfaces Promote the Shedding of Droplets

Tao, Ran; Fang, Wei; Wu, Jun; Dou, Binhong; Xu, Wanghuai; Zheng, Zhanying; Li, Bing; Wang, Zuankai; Feng, Xi‐Qiao; Hao, Chonglei

doi:10.34133/research.0023

Cited by 11 publications

(6 citation statements)

References 42 publications

(40 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, other works, such as designing parallel macro ridges , or adjusting the eccentricity and the size ratio between droplet and ridge, have also been inspired and conducted. Recently, Tao et al found that on a rotating surface, the central film of an impacting droplet could easily break due to the centrifugal force, which reduced the recoiling distance. The droplet could rebound from the surface as a doughnut-like shape, shortening the contact time by 40%.…”

Section: Introductionmentioning

confidence: 99%

Impact Dynamics of a Droplet on Superhydrophobic Cylinders Structured with a Macro Ridge

et al. 2023

View full text Add to dashboard Cite

Reducing the contact time of a droplet hitting a solid surface is crucial for many situations. In this work, the dynamic behavior of a low-viscosity droplet on a superhydrophobic surface, which consists of a cylindrical substrate and a macro ridge placed axially on the peak, was numerically investigated via the lattice Boltzmann method. The focus was given to the spreading and the detaching morphology of the droplet at the Weber number We = 0.84–37.8 and the cylinder-to-droplet radius ratio R* = 0.57–5.71. The ridge is found to redistribute the droplet mass and affect the impact outcomes, as well as the contact time. For each R*, a jug rebound, a stretched rebound straddling the ridge, and a split detachment occur sequentially with the increasing We. When R* does not exceed 1.71, the contact time decreases continuously with the increase in We. With R* being taken between 1.71 and 5.14, the contact time initially reduces with We and plateaus after We reaches 10.3. Once R* exceeds 5.14, the split droplets may present as a bestriding shape at We > 30.3 rather than the regular jug shape with a small We. The contact time would be decreased to a second plateau in this case. In most cases, the contact time can be shortened effectively for the droplet on a ridged cylinder compared with that of a smooth cylinder.

show abstract

Section: Introductionmentioning

confidence: 99%

Impact Dynamics of a Droplet on Superhydrophobic Cylinders Structured with a Macro Ridge

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Capillary force enables the long-distance transport of liquids (figure 5(a)) [69]. Recently, the involvement of external forces in microfluidics is attracting more and more attention [70,71]. For example, electric field forces have been added to the microfluidic devices, including electrically induced wetting, liquid flow, and droplet motion enabled by charges [72,73] (figure 5(b)).…”

Section: Driving Force and Hydrodynamics Inside Microchannelsmentioning

confidence: 99%

Functional microfluidics: theory, microfabrication, and applications

Xie,

Zhan,

et al. 2024

Int. J. Extrem. Manuf.

Self Cite

View full text Add to dashboard Cite

Microfluidic devices are composed of microchannels with a diameter ranging in ten to a few hundred micrometers. Thus, quite small (10-9 to 10-18 litres) amount of liquid can be manipulated by such a precise system. In the past three decades, significant progresses in materials, microfabrication, and various applications have boosted the development of promising functional microfluidic devices. In this review, the recent progresses on novel microfluidic devices with various functions and applications are presented. First, the theory and numerical methods for studying the performance of microfluidic devices are briefly introduced. Then, materials, and fabrication methods of functional microfluidic devices are summarized. Next, from the viewpoint of the applications of the microfluidic devices, the recent significant advances in heat sink, clean water production, chemical reactions, sensor, biomedical field, capillaric circuits, flexible and wearable electronic devices, microrobotics, etc., in turns are then highlighted. Finally, personal perspectives on the challenges and future developments of functional microfluidic devices, aiming to motivate researchers from the fields of engineering, materials, chemistry, mathematics, physics, etc. working together to promote further development and applications of functional microfluidic devices, for the specific purpose of carbon neutrality are provided.

show abstract

“…7 There have been several reports of contact-time reduction by engineering surfaces or substrates. Droplet impact on various engineered surfaces shows distinct mechanisms of contact-time reduction, such as pancake bouncing, 8,9 doughnut bouncing, 10 nonaxisymmetric recoil, 11 and film rupture. 12 Liquid marble (LM), a hydrophobic powder-coated liquid drop, has gained considerable interest in recent years due to its wide range of applications in compound lenses, 13 smart reactors for chemical and biological synthesis, 14,15 logic gates, 16,17 stimuli-responsive adhesive, 18 and sensors.…”

Section: Introductionmentioning

confidence: 99%

“…There have been several reports of contact‐time reduction by engineering surfaces or substrates. Droplet impact on various engineered surfaces shows distinct mechanisms of contact‐time reduction, such as pancake bouncing, 8,9 doughnut bouncing, 10 nonaxisymmetric recoil, 11 and film rupture 12 …”

Section: Introductionmentioning

confidence: 99%

Two modes of contact‐time reduction in the impact of particle‐coated droplets on superhydrophobic surfaces

Lathia,

Modak,

Sen

2023

Droplet

View full text Add to dashboard Cite

Reducing the contact time during droplet impact is essential for many scientific and industrial applications, such as self‐cleaning, anti‐icing, heat transfer, and condensation. This paper reports contact‐time reduction by coating droplets with micro–nano hydrophobic particles. Such particle‐coated droplets are known as liquid marbles (LM). LM impact on superhydrophobic surfaces reveals two different modes of contact‐time reduction. For lower impact energies, the reduced adhesion of LM with the surface is responsible for a reduction of up to 21%. Contact‐time reduction in this regime is found to be independent of particle size but dependent on the solid fraction of LM. However, a fragmentation‐based contact‐time reduction is observed for larger particle sizes and higher impact energies. Here, the reduction is as high as 65%. Such fragmentation occurs because the spreading LM lamella breaks when its thickness becomes similar to particle dimensions. Our findings reveal the potential of LM as a novel approach to reduce contact time during droplet impact, with implications for various scientific and industrial applications.

show abstract

Rotating Surfaces Promote the Shedding of Droplets

Cited by 11 publications

References 42 publications

Impact Dynamics of a Droplet on Superhydrophobic Cylinders Structured with a Macro Ridge

Impact Dynamics of a Droplet on Superhydrophobic Cylinders Structured with a Macro Ridge

Functional microfluidics: theory, microfabrication, and applications

Two modes of contact‐time reduction in the impact of particle‐coated droplets on superhydrophobic surfaces

Contact Info

Product

Resources

About