Accelerating Bubble Detachment in Porous Transport Layers with Patterned Through-Pores

2020 ◽  
Vol 3 (10) ◽  
pp. 9676-9684
Author(s):  
Jason K. Lee ◽  
ChungHyuk Lee ◽  
Kieran F. Fahy ◽  
Pascal J. Kim ◽  
Kevin Krause ◽  
...  
Keyword(s):  
Bubble Detachment

The effect of n-alkanes on the force of air bubble detachment from a quartz surface in water

1983 ◽  
Vol 34 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Bronislaw Janczuk
Keyword(s):  
Quartz Surface ◽  
Air Bubble ◽  
Bubble Detachment

Bubble detachment assisted by electrowetting-driven interfacial wave

2017 ◽  
Vol 29 (10) ◽  
pp. 102105 ◽  
Author(s):  
Haolun Xu ◽  
Run Yan ◽  
Sheng Wang ◽  
Chung-Lung Chen
Keyword(s):  
Interfacial Wave ◽  
Bubble Detachment

scholarly journals Measurements of pitch-off diameter of gas bubbles in liquid metal

2021 ◽  
Vol 2057 (1) ◽  
pp. 012039
Author(s):  
P D Lobanov ◽  
N A Pribaturin ◽  
A I Svetonosov
Keyword(s):  
Liquid Metal ◽  
High Speed ◽  
Electrical Circuit ◽  
Conductivity Method ◽  
Two Phase ◽  
Flow Models ◽  
Bubble Detachment ◽  
Transparent Liquid ◽  
Outflow Channel ◽  
The Rose

Abstract To determine the separation diameter of bubbles in a liquid metal melt, an original technique based on the conductivity method is proposed. A thin electrode is installed in the center of the outflow channel, and the separation of bubbles is determined by closing and opening the electrical circuit. In this way, the separation frequency of the bubbles and their volume can be determined. Additional studies are carried out on a transparent liquid (water). It is shown that the presence of an electrode has little effect on the process of bubble detachment. The processing data of high-speed video filming and the proposed method in a transparent liquid coincide with high accuracy. Measurements of the frequency of bubble detachment in melts of the Rose and lead alloy are carried out. The results obtained are used to tune two-phase flow models when simulating fast neutron reactors with heavy liquid metal coolants.

Evaluation of Factors for Promoting Bubble Detachment from Anodes for Alkaline Water Electrolysis

2021 ◽  
Vol MA2021-02 (58) ◽  
pp. 1735-1735
Author(s):  
Kazuyuki Matsukawa ◽  
Hayata Ikeda ◽  
Yoshiyuki Kuroda ◽  
Ryuta Misumi ◽  
Masatoshi Majima ◽  
...  
Keyword(s):  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
Bubble Detachment

Enhanced surface wettability and innate activity of an iron borate catalyst for efficient oxygen evolution and gas bubble detachment

2019 ◽  
Vol 7 (25) ◽  
pp. 15252-15261 ◽  
Author(s):  
Kamran Dastafkan ◽  
Yibing Li ◽  
Yachao Zeng ◽  
Li Han ◽  
Chuan Zhao
Keyword(s):  
Oxygen Evolution ◽  
Nickel Foam ◽  
Dip Coating ◽  
Surface Wettability ◽  
Gas Bubble ◽  
Iron Borate ◽  
Bubble Detachment ◽  
Enhanced Surface

Alternating dip-coating of iron borate on nickel foam provides surface wettability towards achieving a low-adhesion oxygen evolution electrode.

scholarly journals Numerical Study of Formation of a Series of Bubbles from an Orifice by Applying Dynamic Contact Angle Model

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Nan Chen ◽  
Xiyu Chen ◽  
Antonio Delgado
Keyword(s):  
Contact Angle ◽  
Gas Flow ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Static Contact Angle ◽  
Bubble Shape ◽  
Flow Rates ◽  
Bubble Detachment ◽  
Static Contact ◽  
Detachment Time

The dynamic contact angle model is applied in the formation process of a series of bubbles from Period-I regime to Period-II regime by using the VOF method on a 2D axisymmetric domain. In the first process of the current research, the dynamic contact angle model is validated by comparing the numerical results to the experimental data. Good agreement in terms of bubble shape and bubble detachment time is observed from a lower flow rate Q = 150.8 cm3/min (Re = 54.77, Period-I regime) to a higher flow rate Q = 603.2 cm3/min (Re = 219.07, Period-III regime). The comparison between the dynamic contact angle model and the static contact angle model is also performed. It is observed that the static contact angle model can obtain similar results as the dynamic contact angle model only for smaller gas flow rates (Q ≤ 150.8 cm3/min and Re ≤ 54.77)). For higher gas flow rates, the static contact angle model cannot produce good results as the dynamic contact angle model and has larger relative errors in terms of bubble detachment time and bubble shape.

Electric field effect on bubble detachment in reduced gravity environment

2006 ◽  
Vol 31 (2) ◽  
pp. 121-126 ◽  
Author(s):  
Estelle Iacona ◽  
Cila Herman ◽  
Shinan Chang ◽  
Zan Liu
Keyword(s):  
Electric Field ◽  
Field Effect ◽  
Electric Field Effect ◽  
Reduced Gravity ◽  
Bubble Detachment

Experimental Study of Bubble Behaviour in a Flowing Liquid Layer

2020 ◽  
Author(s):  
Zhengzheng Zhang ◽  
Liangxing Li ◽  
Shuanglei Zhang ◽  
Afnan Saleem
Keyword(s):  
Liquid Layer ◽  
Flow Rate ◽  
Liquid Flow ◽  
Formation Process ◽  
Bubble Formation ◽  
Water Flow Rate ◽  
Nucleation Site ◽  
Flowing Liquid ◽  
Bubble Detachment ◽  
Smooth Channel

Abstract A visualized experimental system is designed and constructed to investigate the bubble dynamic in a flowing liquid layer. Motivated by reducing uncertainties and digging a deep understand on the formation mechanism of boiling bubbles, the bubbles are formed by injecting air through a submerged orifice in our present work, where the influence of thermal physics, nucleation site density and dry spot are stripped. The water flow rate and the air flow rate are in the range of 72–324 ml/min and 0.8–2.0 ml/min, respectively. The bubble formation process in the smooth channel and the rib channel are investigated. The results state that increasing the liquid flow rates lead to the increasing bubble detachment frequency and the decreasing bubble detachment volume. Besides, the larger the liquid flow rate is, the closer the bubble center of mass is to the wall. The rib has a significant influence on the bubble formation process. In the rib channel, it is more difficult for bubbles to detach from the orifice compared that in a smooth channel. Besides, the bubble detachment volume in a rib channel is larger than it in a smooth channel.

Detachment Criterion for Static Axisymmetric Bubbles on Horizontal Flat Surfaces

2009 ◽  
Author(s):  
Shong-Leih Lee ◽  
Chao-Fu Yang
Keyword(s):  
Contact Area ◽  
Contact Angles ◽  
Maximum Volume ◽  
Flat Surfaces ◽  
Bubble Detachment ◽  
Numerical Result ◽  
Detachment Criterion ◽  
The Stability ◽  
The Many ◽  
Maximum Contact

The static Young-Laplace equation is solved with the geometry method to yield the bubble shape on a horizontal flat surface under various contact angles. Multi-solution modes are found. Among the many possible equilibrium shapes of the bubble, however, only the fundamental solution mode could occur naturally. The value of VAR (volume to contact area ratio) could be a good measure for stability of equilibrium bubbles. The bubble becomes less stable when VAR increases. The numerical result reveals that in the course of bubble growth (i.e. volume increases) the VAR of the bubble increases linearly until the maximum contact area is reached. After that, VAR has a sharp increase due to a decreasing contact area. Beyond the maximum volume, equilibrium bubble does not seem possible. Based on the finding, it is postulated that bubble detachment occurs somewhere between the maximum contact area and the maximum volume according to perturbations from environment. However, the postulation seems to underestimate the stability of the bubble significantly for contact angles of larger than 160 degrees. A correction is proposed in the paper. Numerical result of bubble detachment criterion is fitted with polynomial functions of the contact angle.

Recent advances in methods and technologies for enhancing bubble detachment during electrochemical water splitting

2019 ◽  
Vol 114 ◽  
pp. 109300 ◽  
Author(s):  
Ghasem Barati Darband ◽  
Mahmood Aliofkhazraei ◽  
Sangaraju Shanmugam
Keyword(s):  
Water Splitting ◽  
Bubble Detachment ◽  
Recent Advances ◽  
Electrochemical Water Splitting
Sign in / Sign up

Export Citation Format

Share Document