Characterization of transient CO2 transport in two convecting aerosol droplets in Tandem

Wei Hsin Chen, Ming Hang Tsai, Chen I. Hung

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A study of carbon dioxide absorbed by atmospheric aerosol droplets can account for the carbon cycle in the atmosphere in part. To figure out the microphysics of carbon dioxide transport in the atmosphere, a numerical method is developed to predict the transient absorption processes of CO2 by a pair of convecting droplets in tandem. Particular attention is paid to the mass transport influenced by the droplet-droplet interaction. The governing equations include the continuity and momentum equations in gas phase, and the continuity, momentum, and species equations in the liquid phase. Two important parameters of droplet spacing (0.5 and 3 droplet diameter) and Reynolds number (0.1, 1, and 10) are considered. The results show that radial diffusion dominates the H2CO3 transport in the droplets at Re = 0.1, whereas internal circulation plays an important role in moving the solute at Re = 10. As a result, the absorption rates of the two droplets are close to each other, regardless of what the droplet spacing is. For the case of Re = 1, the diffusion and the internal circulation are in a comparable state. The absorption rates of the droplets are affected by the droplet spacing to a small extent. The absorption rate of the downstream droplet is always lower than that of the upstream one, resulting from the disturbance of flow field around the former.

Original languageEnglish
Pages (from-to)207-219
Number of pages13
JournalAerosol and Air Quality Research
Volume14
Issue number1
DOIs
Publication statusPublished - 2014 Feb

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution

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