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Title
  • en Mass transfer caused by gravitational instability at reactive solid–liquid interfaces
Creator
    • en Otomo, Ryoko
    • en Ishii, Nobuhiko
    • en Takahashi, Keita
Accessrights open access
Rights
  • en The final publication is available at Springer via http://dx.doi.org/10.1007/s12650-013-0183-0
Subject
  • Other en Mass transfer
  • Other en Reactive solid-liquid interface
  • Other en Porous media
  • Other en Gravitational instability
  • Other en Convection flow
  • NDC 560
Description
  • Abstract en Mass transfer in porous media has been investigated experimentally. In this paper, we present a visualization technique and discuss the behavior of a substance which transfers under the influence of gravity and reacts with the surface of porous media. Mass transfer by the reaction with porous media was demonstrated by means of electrochemical deposition experiment on particulate beds with complex structures. A copper plate (anode) and a stainless steel particulate bed (cathode) were respectively placed at the upper and bottom side of a thin vertical cell which was filled with copper sulfate solution. After the application of electricity, cupric ion which is provided from the copper plate to the solution transfers under the influence of gravity and it is consumed by deposition at the particulate bed. The behavior of ions between the electrodes was visualized by utilizing the infrared absorption characteristics of cupric ion. We observed gravitational instability and convection flow due to concentration gradient of ions in opposite direction to that of gravity, which is formed by reaction at solid-liquid interfaces. While downward flow caused by Rayleigh-Taylor instability was observed in the case of flat interfaces, upward flow generated from complex-shaped interfaces was greatly dependent on their geometry. The interaction of these flows resulted in the convection throughout the cell. Consequently, it is found from the results that the gravitational instability significantly varies the transport characteristics and that the reactive interface geometry greatly affects the overall mass transfer.
Publisher en Springer
Date
    Issued2014-02
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/57887
Relation
  • isVersionOf DOI https://doi.org/10.1007/s12650-013-0183-0
Journal
    • PISSN 1343-8875
    • EISSN 1875-8975
    • NCID AA11268703
      • en Journal of Visualization
      • Volume Number17 Issue Number1 Page Start49 Page End57
File
Oaidate 2023-07-26