The fate of CO2 bubble leaked from seabed

Baixin Chen, Masahiro Nishio, Yongchen Song, Makoto Akai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A numerical model of an individual CO2 bubble dissolution and ascent in shallow seawater was developed to simulate the fate of CO2 leaked from seabed naturally or artificially. The model consists of a solubility sub-model of CO2 gas in seawater, a CO2 bubble mass transfer sub-model, and a CO2 bubble momentum transfer sub-model. The model is applied to predict the dynamics of leaked CO2 in seawater at various depths from 0-150 m (temperature from 10 {ring operator}C to 25 {ring operator}C) and for initial bubble sizes from 3.0 to 40.0 mm in diameter. A diagram of CO2 ascending distance vs dissolution time is obtained from model simulations. It is found that CO2 bubbles ascend at a mean speed of 16 cm/sec and a mean shrinking rate of 30 × 1 0- 3 mm/s in diameter approximately if leaked from a shallow ocean (<150 m) seabed. A parameter, named as critical depth, is defined and suggested as a parameter to indicate if the CO2 leaked from seabed can return to atmosphere. This critical depth is approximately linearly related to the initial bobble size with a gradient of -0.68 m/mm under seawater conditions in the simulation ocean. © 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)4969-4976
Number of pages8
JournalEnergy Procedia
Volume1
Issue number1
DOIs
Publication statusPublished - Feb 2009
Event9th International Conference on Greenhouse Gas Control Technologies - Washington, United States
Duration: 16 Nov 200820 Nov 2008

Keywords

  • CO 2
  • Dissolusion
  • Droplet/Bubble
  • Modeling
  • Momentum changes

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