Study on the characteristics of hydrogen bubble formation and its transport during electrolysis of water

Chandran, Prasad; Bakshi, Shamit; Chatterjee, Dhiman

doi:10.1016/j.ces.2015.07.041

Cited by 80 publications

(48 citation statements)

References 20 publications

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“…. b = ( ) / These values are similar to those reported previously in water electrolysis experiments (0.22-0.63) [13]. In the case of our experiments, the HB growth is related with the supersaturation of hydrogen gas in solvent.…”

Section: R T K T Lsupporting

confidence: 92%

“…Fine bubbles are currently used to cleaning, as an ultrasound contrast reagent and for blood oxygenation [1][2][3][4][5][6][7]. Fine bubbles are generated by Venturi effect systems, partial heating method, sonication, microfluidic devices and hydrogen bubble method [1][2][3][4][5][6][7][8][9][10][11][12][13]. Bubble growth or shrink kinetics is influenced by generation method and solvent type [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen bubbles (HBs) are generated by electrolysis of conductive water including acid and base, by a method called as the hydrogen bubble method. HBs and OBs are generated from the cathode and anode, respectively [12][13][14][15][16][17][18][19][20]. Simultaneous HB and OB generations using charge-coupled device (CCD) camera were exhibited in KOH solution on proton exchange membrane [12].…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneous HB and OB generations using charge-coupled device (CCD) camera were exhibited in KOH solution on proton exchange membrane [12]. Chandran et al reported the growth rate of HBs in bubble plume during water electrolysis for an hour [13]. Oxygen evolution reaction on perovskite-based electrode was analysed in alkaline media by observing the increase in OB volume using optical microscope and chronocoulometric measurements [14].…”

Section: Introductionmentioning

confidence: 99%

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Control of hydrogen bubble plume during electrolysis of water

et al. 2019

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Hydrogen bubble plumes are generated from the cathode during electrolysis. The plume formation mechanism contributes to the control of bubble diameters and alignment in solvent. The generation of hydrogen bubbles (HBs) and oxygen bubbles (OBs) from electrodes was observed in tap water and saline using a high-speed microscope. Bubble diameter changes were analysed from the obtained microscopic images, and the growth kinetics of HBs and OBs were compared. The result showed that plume formation was primarily dependent on ion strength of water and not voltage to the electrode. HB diameter change in plume was proportional to the distance from the cathode in tap water. Such correlation between HB diameter and distance from the cathode was not observed in saline. By simultaneous observation of HBs and OBs attached to the electrodes, the increase in HB diameter was faster than that of OB. The kinetic properties in HBs and OBs were proportional to (time) 1/2 and (time) 1 , respectively, suggesting that the diffusion of oversaturated hydrogen gas and pressure difference at OB surfaces were dominant. Based on these results, HB plume formation was determined by the lower gas solubility and mass density of HB than that of OB, as well as controlled by voltage and ionic strength of water.

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Section: R T K T Lsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control of hydrogen bubble plume during electrolysis of water

et al. 2019

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“…Bubbles can occlude the entire cross section of a channel, impede the fluid flow, cover the active sites of an electrode and reduce the performance or even damage the system . Such problems are known to occur in fuel cells, electrolysis, microelectromechanical systems, and other devices.…”

Section: Introductionmentioning

confidence: 99%

A novel arterial Wick for gas–liquid phase separation

Pour

Thiessen

2019

AIChE Journal

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Gas–liquid phase separation under microgravity conditions or in small‐scale fluidic systems represents a challenge for two‐phase liquid‐continuous systems. In this study, capillary channels formed by 3‐mm diameter stretched stainless‐steel springs coated with a commercial superhydrophobic coating are used to remove air bubbles from water. A single channel is capable of absorbing a stream of 3.7‐mm diameter bubbles impinging on a small area of the channel at a rate of over 50 bubbles/s. High‐permeability walls lead to fast individual absorption events (4 ms for 2.5‐mm bubbles) where bubble collapse time is limited by the inertia of the surrounding liquid. A horizontal three‐channel array has been shown capable of absorbing impinging bubbles from a sparger at superficial gas velocities of 0.03 m/s. The ultimate capacity of the 3‐mm diameter channel is predicted to be much higher than what could be measured with the existing apparatus. © 2018 American Institute of Chemical Engineers AIChE J, 65: 1340–1354, 2019

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Decomposition kinetics of sodium amalgam in fixed bed of WC‐coated tubular SS‐304 packing: Modelling and validation

Manivannan

Mandal

Dabhade

et al. 2023

Asia-Pacific J Chem Eng

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Erosion of graphite packing in continuously operating fixed bed sodium amalgam decomposers leads to performance degradation accompanied by clogging in the downstream process lines which not only increases the maintenance and catalyst refilling costs but also aggravates the risk of mercury vapour exposure. To overcome this drawback, the present work utilizes tubular SS-304 packing coated with tungsten carbide (WC) on the outer surface. The coating is obtained using an indigenously developed laser-directed energy deposition facility. Dedicated experimental setup is developed for each set of process parameters to comparatively study the fixed bed decomposition kinetics at steady state for three types of WC-coated SS-304 packing and a conventional spherical graphite packing. In parallel, a numerical 3D-1D model is implemented using open source computational solvers and is experimentally validated. The algorithm of this model is based on proposed drop-fill approach for WC-coated SS-304 packing and modified drop approach for spherical graphite packing, respectively. In terms of decomposition rates, the performance of WC-coated SS-304 packing surpasses that of spherical graphite packing at high amalgam flowrates; meanwhile, the average alteration in experimental steadystate temperature profile after continuous operation of 2 years is around 2% for WC-coated SS-304 packing as compared to nearly 17% for spherical graphite packing.

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Study on the characteristics of hydrogen bubble formation and its transport during electrolysis of water

Cited by 80 publications

References 20 publications

Control of hydrogen bubble plume during electrolysis of water

Control of hydrogen bubble plume during electrolysis of water

A novel arterial Wick for gas–liquid phase separation

Decomposition kinetics of sodium amalgam in fixed bed of WC‐coated tubular SS‐304 packing: Modelling and validation

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