Bubble collisions on parallel arranged fibers

Park, Ryeol; Kim, Wonjung

doi:10.1016/j.ijmultiphaseflow.2019.06.016

Cited by 5 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pressure difference across the gas–liquid interface can be determined by ΔP = −σ∇· n̂ , where n̂ is the outward unit vector normal to the interface (from the gas to the liquid side), and consequently, ∇· n̂ is the local interface curvature. At the moment shown in Figure b, the gas–liquid interface curvature causes an increased gas pressure in the top hemisphere, which resists further buildup in gas volume, thus hindering the passage of the bubble through the mesh gap. The maximum capillary antipenetration pressure, − ΔP ap , can be estimated as where P up is the gas pressure at the upper interface (see Figure b), P 0 the liquid pressure at the same interface (reference pressure), and θ c the equilibrium contact angle (≃150°).…”

Section: Results and Discussionmentioning

confidence: 99%

Wettability-Engineered Meshes for Gas Microvolume Precision Handling in Liquids

Bernardini

Sen

Gukeh

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The interaction of rising gas bubbles with submerged air-repelling or air-attracting surfaces is relevant to various technological applications that rely on gas-microvolume handling or removal. This work demonstrates how submerged metal meshes with super air-attracting/repelling properties can be employed to manipulate microvolumes of air, rising buoyantly in the form of bubbles in water. Superaerophobic meshes are observed to selectively allow the passage of air bubbles depending on the mesh pore size, the bubble volume-equivalent diameter, and the bubble impact velocity on the mesh. On the other hand, superaerophilic meshes reduce or amplify the volume captured from a train of incoming bubbles. Finally, a spatial wettability pattern on the mesh is used to control the size of the outgoing bubble, and an empirical relation is formulated to predict the released gas volume. The study demonstrates how porous materials with controlled wettability can be used to precisely modulate and control the outcome of bubble/mesh interactions.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Wettability-Engineered Meshes for Gas Microvolume Precision Handling in Liquids

Bernardini

Sen

Gukeh

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…However, the authors stressed that there is no validation as detailed experiments for cylinders of varying wettability are lacking in literature. Also, in a recent experimental and theoretical study of bubble collisions on parallel arranged fibers, potential effects of fiber wettability are not addressed [16].…”

Section: Introductionmentioning

confidence: 99%

Bubble Cutting by Cylinder – Elimination of Wettability Effects by a Separating Liquid Film

Wang

Rohlfs

Börnhorst

et al. 2022

Chemie Ingenieur Technik

View full text Add to dashboard Cite

Dedicated to Prof. Dr. Thomas Hirth on the occasion of his 60th birthdayExperiments and simulations are presented for the interaction of single bubbles rising in a viscous liquid against a horizontal cylinder (Ø = 4 mm) of varying wettability. The slide-off of small and the cutting of larger bubbles into two daughter bubbles observed in the experiment are reproduced by phase-field simulations. It is shown that in the entire process bubble and cylinder are separated by a liquid film, which eliminates any influence of cylinder wettability. Before the mother bubble splits, a thinning gas thread develops below the cylinder. The rupture of this gas thread can lead to a different number of satellite bubbles depending on the conditions.

show abstract