Electrolyte and temperature effects in a rising bubble

In this work, the rise characteristics of a single H2 bubble, in the ellipsoidal regime, in (i) water, (ii) single electrolyte (2 M, 4.5 M NaCl) solution and (iii) various concentrations of electrolyte mixture (up to 6.4 M of 1:5 weight fraction NaCl-NaClO3), have been studied, at temperatures up to 80 degrees C. Our results show that both individual and collective effects of the temperature and the electrolyte concentration on the rise velocity and the bubble shape are purely dependent on the changes in liquid properties (density, viscos-ity, and surface tension); the bubble motion can be described by known non-dimensional correlations for clean bubble rise in pure fluids. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).