Visualization of Multiphase Reactive Flow and Mass Transfer in Functionalized Microfluidic Porous Media

Hangkai Wei, Xin Sha, Li Chen*, Zi Wang, Chuangde Zhang, Peng He, Wen Quan Tao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Multiphase reactive flow in porous media is an important research topic in many natural and industrial processes. In the present work, photolithography is adopted to fabricate multicomponent mineral porous media in a microchannel, microfluidics experiments are conducted to capture the multiphase reactive flow, methyl violet 2B is employed to visualize the real-time concentration field of the acid solution and a sophisticated image processing method is developed to obtain the quantitative results of the distribution of different phases. With the advanced methods, experiments are conducted with different acid concentration and inlet velocity in different porous structures with different phenomena captured. Under a low acid concentration, the reaction will be single phase. In the gaseous cases with higher acid concentration, preferential flow paths with faster flow and reaction are formed by the multiphase hydrodynamic instabilities. In the experiments with different inlet velocities, it is observed that a higher inlet velocity will lead to a faster reaction but less gas bubbles generated. In contrast, more gas bubbles would be generated and block the flow and reaction under a lower inlet velocity. Finally, in heterogeneous structures, fractures or cavities would significantly redirect the flow and promote the formation of preferential flow path nearby.

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 2024
Externally publishedYes

Keywords

  • calcite dissolution
  • dissolution modes
  • mass concentration visualization
  • microfluidics
  • multiphase reactive flow

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