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Visualization of counter-current convection induced by microbubbles and small particles

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Abstract

We use visualization to investigate the structure of the counter-current convection induced by microbubbles and small particles. In particular, we study the effect of small particles with different specific gravities on the gas-phase flow. In our experiments, microbubbles are injected into stationary liquid from a bubble generator that is set at the bottom of a vertical channel, and small particles are injected from a particle injector that is set at the top of the channel. The mean kinetic energy of the gas-phase is significantly lower in the flow with microbubbles and small particles than in the flow with only microbubbles. This results from significant suppression of the interaction of bubble plumes by the small particles. Moreover, the mean kinetic energy of the gas-phase in the flow with microbubbles and small particles is strongly dependent on the specific gravity of the small particles.

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Acknowledgments

The authors gratefully acknowledge support by Grant-in-Aid for Young Scientists (B) No. 22760151.

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Authors and Affiliations

  1. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    Atsuhide Kitagawa & Takuya Mimura

  2. Department of Mechanical Systems Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903-0213, Japan

    Masaaki Ishikawa

  3. Division of Energy and Environmental System, Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, 060-8628, Japan

    Yuichi Murai

Authors
  1. Atsuhide Kitagawa
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  2. Takuya Mimura
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  3. Masaaki Ishikawa
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  4. Yuichi Murai
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Correspondence to Atsuhide Kitagawa.

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Kitagawa, A., Mimura, T., Ishikawa, M. et al. Visualization of counter-current convection induced by microbubbles and small particles. J Vis 16, 313–321 (2013). https://doi.org/10.1007/s12650-013-0184-z

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  • DOI: https://doi.org/10.1007/s12650-013-0184-z

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