scholarly journals Influence of liquid bridge formation process on its stability in nonparallel plates

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 20138-20144
Author(s):  
Xiongheng Bian ◽  
Haibo Huang ◽  
Liguo Chen
Keyword(s):  
Formation Process ◽  
Liquid Bridge ◽  
Theoretical Equation ◽  
Bridge Formation ◽  
The Stability

The effect of liquid bridge formation process on its stability was discussed to obtain the theoretical equation for determining the stability of the liquid bridge.

Electrohydrodynamic stability: Taylor–Melcher theory for a liquid bridge suspended in a dielectric gas

2002 ◽  
Vol 452 ◽  
pp. 163-187 ◽  
Author(s):  
C. L. BURCHAM ◽  
D. A. SAVILLE
Keyword(s):  
Surface Tension ◽  
Dielectric Constant ◽  
Electric Fields ◽  
Liquid Bridge ◽  
Numerical Solutions ◽  
Specific Conductivity ◽  
Axisymmetric Deformation ◽  
Aspect Ratios ◽  
The Stability ◽  
Theory And Experiment

A liquid bridge is a column of liquid, pinned at each end. Here we analyse the stability of a bridge pinned between planar electrodes held at different potentials and surrounded by a non-conducting, dielectric gas. In the absence of electric fields, surface tension destabilizes bridges with aspect ratios (length/diameter) greater than π. Here we describe how electrical forces counteract surface tension, using a linearized model. When the liquid is treated as an Ohmic conductor, the specific conductivity level is irrelevant and only the dielectric properties of the bridge and the surrounding gas are involved. Fourier series and a biharmonic, biorthogonal set of Papkovich–Fadle functions are used to formulate an eigenvalue problem. Numerical solutions disclose that the most unstable axisymmetric deformation is antisymmetric with respect to the bridge’s midplane. It is shown that whilst a bridge whose length exceeds its circumference may be unstable, a sufficiently strong axial field provides stability if the dielectric constant of the bridge exceeds that of the surrounding fluid. Conversely, a field destabilizes a bridge whose dielectric constant is lower than that of its surroundings, even when its aspect ratio is less than π. Bridge behaviour is sensitive to the presence of conduction along the surface and much higher fields are required for stability when surface transport is present. The theoretical results are compared with experimental work (Burcham & Saville 2000) that demonstrated how a field stabilizes an otherwise unstable configuration. According to the experiments, the bridge undergoes two asymmetric transitions (cylinder-to-amphora and pinch-off) as the field is reduced. Agreement between theory and experiment for the field strength at the pinch-off transition is excellent, but less so for the change from cylinder to amphora. Using surface conductivity as an adjustable parameter brings theory and experiment into agreement.

Control by Mixed-Chloride Additives of the Quality and Homogeneity of Bulk Halide Perovskite upon Film Formation Process

2021 ◽  
Author(s):  
Thierry Pauporté ◽  
Daming zheng
Keyword(s):  
Solar Cells ◽  
Formation Process ◽  
High Efficiency ◽  
Film Formation ◽  
Perovskite Solar Cells ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stability Issue ◽  
Halide Perovskite ◽  
The Stability

Nowadays, overcoming the stability issue of perovskite solar cells (PSCs) while keeping high efficiency has become an urgent need for the future of this technology. By using x-ray diffraction (XRD),...

The stability of an encapsulated cylindrical liquid bridge subject to off-centering

2005 ◽  
Vol 17 (3) ◽  
pp. 032102
Author(s):  
A. Kerem Uguz ◽  
R. Narayanan
Keyword(s):  
Liquid Bridge ◽  
The Stability

The Stability of a Thermocapillary-Buoyant Flow in a Liquid Bridge with Heat Transfer Through the Interface

2014 ◽  
Vol 26 (1) ◽  
pp. 17-28 ◽  
Author(s):  
T. Watanabe ◽  
D. E. Melnikov ◽  
T. Matsugase ◽  
V. Shevtsova ◽  
I. Ueno
Keyword(s):  
Heat Transfer ◽  
Liquid Bridge ◽  
Buoyant Flow ◽  
The Stability

Enriched primary kaolins of Uzbekistan as a raw material for chamotte lightweight refractories

2019 ◽  
pp. 8-11 ◽  
Author(s):  
M. Kh. Rumi ◽  
Sh. K. Irmatova ◽  
Sh. A. Fayziev ◽  
E. P. Mansurova ◽  
E. M. Urazaeva ◽  
...  
Keyword(s):  
Phase Composition ◽  
Water Absorption ◽  
Phase Formation ◽  
Formation Process ◽  
Raw Material ◽  
Promising Material ◽  
Crystalline Phases ◽  
Optimal Ratio ◽  
The Stability ◽  
Phase Formation Process

The results of studies of the phase formation process of enriched primary kaolins of the Angren and Samarkand fields during firing in the range of 1250‒1400 oC are presented. It is shown that the stability of the phase composition, the optimal ratio of the crystalline phases, shrinkage and water absorption indices allow us to consider the enriched kaolin of the Samarkand field as a promising material for making chamotte lightweight refractories. Ill. 3. Ref. 11. Tab. 3. 

Capillary-Based Liquid Micro/Nano Deposition

2011 ◽  
Author(s):  
Artur Lutfurakhmanov ◽  
Yechun Wang ◽  
Douglas L. Schulz ◽  
Iskander S. Akhatov
Keyword(s):  
Liquid Bridge ◽  
Liquid Droplet ◽  
Applied Pressure ◽  
Deposition Process ◽  
Contact Angles ◽  
Liquid Pressure ◽  
Bridge Formation ◽  
Non Invasive ◽  
Two Parameters ◽  
Nano Imprint

Micro/Nanolithography is a creation of micro/nano features on the substrate. Several lithography techniques have been recently developed, including dip-pen nanolithography, nano-imprint lithography, electron-beam lithography, and photolithography. However, all these techniques possess some limitations because of a direct contact with the substrate. This paper proposes a new method that is non-invasive both to the substrate and to the writing tip. The method is based on hollow capillary filled with liquid to be deposited. The application of pressure from one side of capillary causes the liquid meniscus to form at the capillary outlet. Touching the substrate with the meniscus only leads to the liquid bridge formation between the capillary and the substrate. Withdrawing the capillary away from the substrate causes deposition of liquid droplet on the substrate. Theoretical modeling reveals two possible regimes of the liquid bridge formation: stable — “good” bridge and unstable — “bad” bridge. Liquid bridge stability map was created based on two parameters: liquid pressure and the capillary-substrate distance. It was found that the main parameter responsible for the deposition process is the applied pressure. Three pressure ranges were identified with different deposition scenarios. The influence of liquid-capillary and liquid-substrate equilibrium contact angles along with the capillary wall thickness on the liquid bridge stability is discussed.

A Constrained Level Set Method for Simulating the Formation of Liquid Bridges

2012 ◽  
Vol 12 (2) ◽  
pp. 577-594 ◽  
Author(s):  
Dongdong He ◽  
Huaxiong Huang
Keyword(s):  
Level Set Method ◽  
Level Set ◽  
Liquid Bridge ◽  
Bridge Formation ◽  
Level Set Function ◽  
Limited Applicability ◽  
Plate Size ◽  
Static Energy ◽  
Model Equations ◽  
Set Function

AbstractIn this paper, we investigate the dynamic process of liquid bridge formation between two parallel hydrophobic plates with hydrophilic patches, previously studied in [1]. We propose a dynamic Hele-Shaw model to take advantage of the small aspect ratio between the gap width and the plate size. A constrained level set method is applied to solve the model equations numerically, where a global constraint is imposed in the evolution [2] stage together with local constraints in the reinitialization [3] stage of level set function in order to limit numerical mass loss. In contrast to the finite element method used in [2], we use a finite difference method with a 5th order HJWENO scheme for spatial discretization. To illustrate the effectiveness of the constrained method, we have compared the results obtained by the standard level set method with those from the constrained version. Our results show that the constrained level set method produces physically reasonable results while that of the standard method is less reliable. Our numerical results also show that the dynamic nature of the flow plays an important role in the process of liquid bridge formation and criteria based on static energy minimization approach has limited applicability.

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