Separation of a binary gas mixture by thermal diffusion in a two-dimensional cascade of many small cavities

Takumi Saiki, Naoki Ono, Sohei Matsumoto, Shinya Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

A new method for separating a binary gas mixture, such as hydrogen and carbon dioxide, is proposed and investigated numerically and experimentally. As a pressure driven flow of the mixture goes through a two-dimensional Burgers cascade, the components are separated due to thermal diffusion and the amplifying effect of the cascade. Unlike traditional cascades in isotope separation, active elements like pumps are absent. The device is made thin enough so that the flow and the concentration distribution reaches an equilibrium within each cell. We have observed separation of up to about 9% in hydrogen concentration in our prototype array consisting of over 19,000 cavities placed under a 160-degree temperature difference.

Original languageEnglish
Article number120394
JournalInternational Journal of Heat and Mass Transfer
Volume163
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Burgers equation
  • Clusius-Dickel column
  • Hydrogen separation
  • Micro-channel
  • Soret effect
  • Two-dimensional cascade

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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