IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v14y2021i12p3386-d571299.html
   My bibliography  Save this article

Promoting Effect of Ultra-Fine Bubbles on CO 2 Hydrate Formation

Author

Listed:
  • Tsutomu Uchida

    (Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan)

  • Hiroshi Miyoshi

    (Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan)

  • Kenji Yamazaki

    (Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan)

  • Kazutoshi Gohara

    (Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan)

Abstract

When gas hydrates dissociate into gas and liquid water, many gas bubbles form in the water. The large bubbles disappear after several minutes due to their buoyancy, while a large number of small bubbles (particularly sub-micron-order bubbles known as ultra-fine bubbles (UFBs)) remain in the water for a long time. In our previous studies, we demonstrated that the existence of UFBs is a major factor promoting gas hydrate formation. We then extended our research on this issue to carbon dioxide (CO 2 ) as it forms structure-I hydrates, similar to methane and ethane hydrates explored in previous studies; however, CO 2 saturated solutions present severe conditions for the survival of UFBs. The distribution measurements of CO 2 UFBs revealed that their average size was larger and number density was smaller than those of other hydrocarbon UFBs. Despite these conditions, the CO 2 hydrate formation tests confirmed that CO 2 UFBs played important roles in the expression of the promoting effect. The analysis showed that different UFB preparation processes resulted in different promoting effects. These findings can aid in better understanding the mechanism of the promoting (or memory) effect of gas hydrate formation.

Suggested Citation

  • Tsutomu Uchida & Hiroshi Miyoshi & Kenji Yamazaki & Kazutoshi Gohara, 2021. "Promoting Effect of Ultra-Fine Bubbles on CO 2 Hydrate Formation," Energies, MDPI, vol. 14(12), pages 1-10, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3386-:d:571299
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/14/12/3386/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/14/12/3386/
    Download Restriction: no
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3386-:d:571299. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.