Bubbles on surfaces : diffusive growth and electrolysis

Abstract

The history effect on bubble growth and dissolution. Part 2. Experiments and simulations of a spherical bubble attached to a horizontal flat plate, J. Fluid Mech. 820, 479-510 (2017) † Experiments performance and analysis by Á. Moreno Soto and P. Peñas-López. Á. Moreno Soto wrote the experimental section of the article and its review. P. Peñas-López was the head of the project and took care of the numerical analysis and the writing. All the authors discussed the results and proofread the article. 2Gas depletion through single gas bubble diffusive growth * When a gas bubble grows by diffusion in a gas-liquid solution, it affects the distribution of gas in its surroundings. If the density of the solution is sensitive to the local amount of dissolved gas, there is the potential for the onset of natural convection, which will affect the bubble growth rate. The experimental study of the successive quasi-static growth of many bubbles from the same nucleation site described in this paper illustrates some consequences of this effect. The enhanced growth due to convection causes a local depletion of dissolved gas in the neighbourhood of each bubble beyond that due to pure diffusion. The quantitative data of sequential bubble growth provided in the paper show that the radius-versus-time curves of subsequent bubbles differ from each other due to this phenomenon. A simplified model accounting for the local depletion is able to collapse the experimental curves and to predict the progressively increasing bubble detachment times.

Review on Bubble Dynamics in Proton Exchange Membrane Water Electrolysis: Towards Optimal Green Hydrogen Yield

“…As a result, bubble growth accelerates significantly with a high temperature. The bubble growth rate is dependent on different factors including geometrical design, pressure, temperature, current densities, and surfactants [17,139]. Bubble growth in water electrolysis is shown in Figure 8.…”

Bubbles and membranes : electrolysis at the mesoscale

“…Nucleation in electrochemical processes is typically heterogeneous i.e., it occurs at the electrode-electrolyte interface as opposed to homogeneous nucleation which occurs in the liquid phase. The creation of the gas-liquid phase boundary in homogeneous nucleation requires a large amount of energy and it only occurs in cases such as boiling liquids [141]. On the other hand, heterogeneous nucleation is more common because the thermodynamic barrier for the formation of the gas-phase is lowered by the presence of a solid surface [142][143][144].…”