Dynamics of Single Hydrogen Bubbles at Pt Microelectrodes in Microgravity

2021 ◽  
Author(s):  
Aleksandr Bashkatov ◽  
Xuegeng Yang ◽  
Gerd Mutschke ◽  
Barbara Fritzsche ◽  
Syed Sahil Hossain ◽  
...  
Keyword(s):  
Parabolic Flights ◽  
Hydrogen Bubbles ◽  
Bubble Evolution

The dynamics of single hydrogen bubbles electrogenerated in acidic electrolytes at a Pt microelectrode under potentiostatic conditions is investigated in microgravity during parabolic flights. Three bubble evolution scenarios have been...

MEASUREMENTS OF PHORETIC VELOCITIES IN MICROGRAVITY CONDITIONS OF PARABOLIC FLIGHTS

2001 ◽  
Vol 32 ◽  
pp. 941-942
Author(s):  
F. PRODI ◽  
F. DUBOIS ◽  
A.A. VEDERNIKOV ◽  
G. SANTACHIARA ◽  
C. CORNETTI ◽  
...  
Keyword(s):  
Parabolic Flights ◽  
Microgravity Conditions

Growth and detachment of single hydrogen bubbles in a magnetohydrodynamic shear flow

2017 ◽  
Vol 2 (9) ◽  
Author(s):  
Dominik Baczyzmalski ◽  
Franziska Karnbach ◽  
Gerd Mutschke ◽  
Xuegeng Yang ◽  
Kerstin Eckert ◽  
...  
Keyword(s):  
Shear Flow ◽  
Hydrogen Bubbles

scholarly journals In-Situ TEM Annealing Observation of Helium Bubble Evolution in Pre-Irradiated FeCoNiCrTi0.2 Alloys

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3727
Author(s):  
Huanhuan He ◽  
Zhiwei Lin ◽  
Shengming Jiang ◽  
Xiaotian Hu ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Vacuum Arc ◽  
In Situ Tem ◽  
Face Centered Cubic ◽  
Helium Bubble ◽  
High Entropy ◽  
Helium Bubbles ◽  
Transmission Electron ◽  
Bubble Evolution ◽  
Face Centered

The FeCoNiCrTi0.2 high-entropy alloys fabricated by vacuum arc melting method, and the annealed pristine material, are face centered cubic structures with coherent γ’ precipitation. Samples were irradiated with 50 keV He+ ions to a fluence of 2 × 1016 ions/cm2 at 723 K, and an in situ annealing experiment was carried out to monitor the evolution of helium bubbles during heating to 823 and 923 K. The pristine structure of FeCoNiCrTi0.2 samples and the evolution of helium bubbles during in situ annealing were both characterized by transmission electron microscopy. The annealing temperature and annealing time affect the process of helium bubbles evolution and formation. Meanwhile, the grain boundaries act as sinks to accumulate helium bubbles. However, the precipitation phase seems have few effects on the helium bubble evolution, which may be due to the coherent interface and same structure of γ’ precipitation and matrix.

scholarly journals The effect of magnetic field on the dynamics of gas bubbles in water electrolysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan-Hom Li ◽  
Yen-Ju Chen
Keyword(s):  
Magnetic Field ◽  
Swirling Flow ◽  
Gas Bubbles ◽  
Water Electrolysis ◽  
Platinum Electrodes ◽  
Optimal Layout ◽  
Parallel Magnetic Field ◽  
Hydrogen Bubbles ◽  
The Magnetic Field ◽  
Sluggish Flow

AbstractThis study determines the effect of the configuration of the magnetic field on the movement of gas bubbles that evolve from platinum electrodes. Oxygen and hydrogen bubbles respectively evolve from the surface of the anode and cathode and behave differently in the presence of a magnetic field due to their paramagnetic and diamagnetic characteristics. A magnetic field perpendicular to the surface of the horizontal electrode causes the bubbles to revolve. Oxygen and hydrogen bubbles revolve in opposite directions to create a swirling flow and spread the bubbles between the electrodes, which increases conductivity and the effectiveness of electrolysis. For vertical electrodes under the influence of a parallel magnetic field, a horizontal Lorentz force effectively detaches the bubbles and increases the conductivity and the effectiveness of electrolysis. However, if the layout of the electrodes and magnetic field results in upward or downward Lorentz forces that counter the buoyancy force, a sluggish flow in the duct inhibits the movement of the bubbles and decreases the conductivity and the charging performance. The results in this study determine the optimal layout for an electrode and a magnetic field to increase the conductivity and the effectiveness of water electrolysis, which is applicable to various fields including energy conversion, biotechnology, and magnetohydrodynamic thruster used in seawater.

Model for hydrogen bubbles and connection to roughness of etched surfaces

2008 ◽  
Vol 129 (15) ◽  
pp. 156101 ◽  
Author(s):  
Teemu Hynninen ◽  
Miguel A. Gosálvez
Keyword(s):  
Hydrogen Bubbles

Wavelet analysis of chlorine bubble evolution on electrodes with different surface morphologies

2012 ◽  
Vol 22 ◽  
pp. 16-20 ◽  
Author(s):  
Ruiyong Chen ◽  
Vinh Trieu ◽  
Harald Natter ◽  
Jürgen Kintrup ◽  
Andreas Bulan ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Bubble Evolution ◽  
Surface Morphologies

An extended Rayleigh model of bubble evolution

2001 ◽  
Vol 13 (1) ◽  
pp. 20-31 ◽  
Author(s):  
Michael E. Glinsky ◽  
David S. Bailey ◽  
Richard A. London ◽  
Peter A. Amendt ◽  
Alexander M. Rubenchik ◽  
...  
Keyword(s):  
Bubble Evolution

scholarly journals The Experience of Non-Stationary Flow Visualization Using the Hydrogen Bubble Method

2019 ◽  
pp. 60-70
Author(s):  
S.M. Krivel ◽  
I.O. Bobarika
Keyword(s):  
Research Methods ◽  
Gas Flow ◽  
Stationary Flow ◽  
Experimental Models ◽  
Experimental Equipment ◽  
Incident Flow ◽  
Kinematic Parameters ◽  
Physical Processes ◽  
Hydrogen Bubbles ◽  
Design Construction

The study of the spectra of flow is carried out by experimental methods. The paper summarizes the authors’ experience in the design, construction and use of hydrodynamic installations for the visualization of liquid or gas flow using hydrogen bubbles obtained by electrolysis of water. The design of a vertical hydrodynamic pipe, the technology of making experimental models, the design and purpose of the main equipment are considered. Research methods and procedures are described. The article presents the results of the studies that make it possible to evaluate the capabilities of the experimental equipment and picture physical processes around the bodies that change the kinematic parameters of motion in the incident flow according to a given law. The proposed research methods and experimental equipment are distinguished by originality. They can be used to study the features of macrostructures around bodies of complex geometric shapes and laws of motion.

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