Characteristics of Dissolved Gas Evolution Rate under Different Loading Factors

2021 ◽  
Author(s):  
Heri Sutikno ◽  
Rahman Azis Prasojo ◽  
Suwarno
Keyword(s):  
Evolution Rate ◽  
Gas Evolution ◽  
Dissolved Gas

An Evaluation of Hydrogen Evolution from Corrosion of Carbon Steel in Low/Intermediate Level Waste Repositories

1994 ◽  
Vol 353 ◽  
Author(s):  
Fumio Matsuda ◽  
Ryutaro Wada ◽  
Kazuo Fujiwara ◽  
Ai Fujiwara
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Hydrogen Evolution ◽  
Hydrogen Gas ◽  
Intermediate Level ◽  
Evolution Rate ◽  
List Type ◽  
Gas Evolution ◽  
Hydrogen Evolution Rate ◽  
Waste Repositories

AbstractAs a sequence of studies to evaluate the quantity of gas evolution from low/intermediate level waste repositories,hydrogen gas evoluted from corrosion of carbon steel in simulated repository environment was evaluated by laboratory experiments. The experimental results on the hydrogen gas evolution both in air purging condition simulated oxidizing environment and nitrogen purging condition simulated reducing environment, are summarized as follows.(1)Hydrogen gas evolution enough to analyze quantitavely by gas chromatography (>5ppm) has been recognized under almost all test conditions except reducing equilibrium cement water.(2)Effects of purging gas (air,nitrogen) on the hydrogen gas evolution and the corrosion rate calculated from weight loss were air purge > nitrogen purge. On the other hand, the contribution ratio of hydrogen evolution reaction in corrosion rate was nitrogen purge > air purge.(3)Effects of test solution on the hydrogen evolution rate were as fo11ows. • Air Purge :Equilibrium Bentonite Water ≈ Equilibrium Cement Water > Synthetic Sea Watert• N2 Purge:Synthetic Sea Water > Equilibrium Bentonite Water >> Equilibrium Cement Water(4)No distinct effect of crevice geometry of test specimen on hydrogen evolution rate was recognized. Only under the reducing equilibrium cement water, however, the increase of hydrogen evolution was confirmed after the immersion of several hundred hours.(5)Hydrogen evolution rates tended to decrease with testing time except in the reducing equilibrium cement water.(6)No distinct difference of hydrogen evolution rate between steels (SPHC, SPCC) was observed.

scholarly journals Decoupling Gas Evolution from Water-Splitting Electrodes

2019 ◽  
Author(s):  
Pablo Peñas ◽  
Peter van der Linde ◽  
Wouter Vijselaar ◽  
Devaraj van der Meer ◽  
Detlef Lohse ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Electrolysis ◽  
Gas Evolution ◽  
Dissolved Gas ◽  
Alkaline Water Electrolysis ◽  
Transport Models ◽  
Cell Potential ◽  
Transient Behaviour ◽  
Mass Transfer Processes ◽  
Novel Method

<div><div><div><p>Bubbles are known to hinder electrochemical processes in water-splitting electrodes. In this study, we present a novel method to promote gas evolution away from the electrode surface. We consider a ring microelectrode encircling a hydrophobic microcavity from which a succession of bubbles grows. The ring microelectrode, tested under alkaline water electrolysis conditions, does not suffer from bubble coverage. Consequently, the chronopotentiometric fluctuations of the cell are weaker than those associated with conventional microelectrodes. Herein, we provide fundamental understanding of the mass transfer processes governing the transient behaviour of the cell potential. With the help of numerical transport models, we demonstrate that bubbles forming at the cavity reduce the concentration overpotential by lowering the surrounding concentration of dissolved gas, but may also aggravate the ohmic overpotential by blocking ion-conduction pathways. The theoretical and experimental insight gained have relevant implications in the design of efficient gas-evolving electrodes.</p></div></div></div>

scholarly journals Concentration profile of dissolved gas during hydrogen gas evolution: an optical approach

2020 ◽  
Vol 56 (92) ◽  
pp. 14483-14486
Author(s):  
Kota Ando ◽  
Yoshiharu Uchimoto ◽  
Takashi Nakajima
Keyword(s):  
Concentration Profile ◽  
Hydrogen Gas ◽  
Optical Image ◽  
Gas Evolution ◽  
Dissolved Gas ◽  
Image Tracking ◽  
Dissolved Hydrogen

Optical image tracking of individual bubbles enables us to extract the concentration profile of dissolved hydrogen as a function of distance from the electrode.

A Technique for Measuring Gas Evolution Rate in Electrochemical Reactions

1975 ◽  
Vol 6 (2) ◽  
pp. 107-117 ◽  
Author(s):  
S. A. Had[zbreve]i Jordanov ◽  
D. M. Dra[zbreve]ić
Keyword(s):  
Evolution Rate ◽  
Electrochemical Reactions ◽  
Gas Evolution

scholarly journals Gas Evolution Rate of Black-Epoxy Painted Surfaces

Shinku ◽  
1967 ◽  
Vol 10 (3) ◽  
pp. 93-98
Author(s):  
Katsuya NAKAYAMA
Keyword(s):  
Evolution Rate ◽  
Gas Evolution

Gas-Kick Simulation in Oil-Based Drilling Fluids with Nonequilibrium Gas-Dissolution and -Evolution Effects

SPE Journal ◽  
2021 ◽  
pp. 1-21
Author(s):  
Zhengming Xu ◽  
Xuejiao Chen ◽  
Xianzhi Song ◽  
Zhaopeng Zhu ◽  
Wenping Zhang
Keyword(s):  
Drilling Fluid ◽  
Drilling Fluids ◽  
Gas Evolution ◽  
Dissolved Gas ◽  
Efficient Treatment ◽  
Nonequilibrium Gas ◽  
Gas Kick ◽  
Wellbore Pressure ◽  
Outflow Rate ◽  
State Models

Summary The nonequilibrium dissolution and evolution characteristics of gas in oil-based drilling fluids (OBDFs) greatly affect the ratio of free gas to dissolved gas in the wellbore, thus influencing the prediction accuracy of the wellbore-pressure and surface responses. Previous equilibrium-state models can result in the incorrect estimation of the multiphase-flow parameters during a gas kick in OBDFs. Therefore, a nonequilibrium gas/liquid two-phase-flow model is developed for simulations of gas kicks in OBDFs. Nonequilibrium gas-kick behaviors in OBDFs are investigated using the proposed model, and it is concluded that there is a unique gas-dissolving stage in comparison to the equilibrium gas-kick conditions. In this stage, the pit gain decreases to a large extent, and this phenomenon can be misinterpreted by the drilling crew as a loss of circulation or a decrease in the gas-kick intensity. The drilling-fluid-outflow rate is not a reliable gas-kick indicator because of the lower increment in the drilling-fluid-outflow rate under both nonequilibrium and equilibrium gas-dissolution conditions. Neglecting the gas-evolution rate in OBDFs could lead to overestimations of the maximum pit gain and the drilling-fluid-outflow rate. More gas moves from the wellbore in the form of dissolved gas under noninstantaneous gas-evolution conditions. The results of this study provide a theoretical basis for the safe and efficient treatment of gas kicks in OBDFs.

scholarly journals Decoupling Gas Evolution from Water-Splitting Electrodes

2019 ◽  
Author(s):  
Pablo Peñas ◽  
Peter van der Linde ◽  
Wouter Vijselaar ◽  
Devaraj van der Meer ◽  
Detlef Lohse ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Electrolysis ◽  
Gas Evolution ◽  
Dissolved Gas ◽  
Alkaline Water Electrolysis ◽  
Transport Models ◽  
Cell Potential ◽  
Transient Behaviour ◽  
Mass Transfer Processes ◽  
Novel Method

<div><div><div><p>Bubbles are known to hinder electrochemical processes in water-splitting electrodes. In this study, we present a novel method to promote gas evolution away from the electrode surface. We consider a ring microelectrode encircling a hydrophobic microcavity from which a succession of bubbles grows. The ring microelectrode, tested under alkaline water electrolysis conditions, does not suffer from bubble coverage. Consequently, the chronopotentiometric fluctuations of the cell are weaker than those associated with conventional microelectrodes. Herein, we provide fundamental understanding of the mass transfer processes governing the transient behaviour of the cell potential. With the help of numerical transport models, we demonstrate that bubbles forming at the cavity reduce the concentration overpotential by lowering the surrounding concentration of dissolved gas, but may also aggravate the ohmic overpotential by blocking ion-conduction pathways. The theoretical and experimental insight gained have relevant implications in the design of efficient gas-evolving electrodes.</p></div></div></div>

The Effect of Gas Property on Atomization Features of Dissolved Gas Jet

1997 ◽  
Vol 24 (1-3) ◽  
pp. 180-188
Author(s):  
Shao Yiming ◽  
Zhen Huang ◽  
Siichi Shiga ◽  
Hisao Nakamura ◽  
Takao Karasawa
Keyword(s):  
Gas Jet ◽  
Dissolved Gas
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