Gas depletion through single gas bubble diffusive growth and its effect on subsequent bubbles

ORAL

Abstract

In weakly supersaturated mixtures, bubbles are known to grow quasi-statically as diffusion-driven mass transfer governs the process. In the final stage of the evolution, before detachment, there is an enhancement of mass transfer, which changes from diffusion to natural convection [O.R. Enr\'iquez et al., The quasi-static growth of CO2 bubbles, \textit{Journal of Fluid Mechanics} \textbf{741}, R1 (2014)]. Once the bubble detaches, it leaves behind a gas-depleted area. The diffusive mass transfer towards that region cannot compensate for the amount of gas which is taken away by the bubble. Consequently, the consecutive bubble will grow in an environment which contains less gas than for the previous one. This reduces the local supersaturation of the mixture around the nucleation site, leading to a reduced bubble growth rate. We present quantitative experimental data on this effect and the theoretical model for depletion during the bubble growth rate.

*This work was supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation programme funded by the Ministry of Education, Culture and Science of the government of the Netherlands.

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Authors

  • Alvaro Moreno Soto

    • Physics of Fluids Group, University of Twente

  • Andrea Prosperetti

    • Department of Mechanical Engineering, John Hopkins University
    • University of Houston, University of Twente

  • Detlef Lohse

    • University of Twente
    • Physic of Fluids Group, University of Twente
    • Physics of Fluids Group, Mesa+ Institute and J.M. Burgers Centre for Fluid Dynamics, University of Twente, The Netherlands
    • Physics of Fluids, MESA+ institute, University of Twente, the Netherlands
    • Physics of Fluids Group, University of Twente, The Netherlands
    • Physics of Fluids group, Faculty of Science and Technology, University of Twente, The Netherlands
    • Physics of Fluids, Faculty of Science \& Technology, University of Twente, The Netherlands
    • Physics of Fluids Group, Faculty of Science and Technology, J. M. Burgers Center for Fluid Dynamics and MESA+ Institute, University of Twente
    • Physics of Fluids Group, University of Twente, The Netherlands.
    • Physics of Fluids Group, University of Twente
    • Physics of Fluids, University of Twente

  • Devaraj van der Meer

    • Physics of Fluids Group, University of Twente