Detail study on improving micro/nano gas mixer performances in slip and transitional flow regimes

Darbandi, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.snb.2015.03.097
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. The mixer geometry has substantial effect on mixing performance of different micro/nanomixers. Despite past numerous studies dedicated to mixing of liquid flow streams, there are less efforts to investigate the geometry effects on gas mixing performances. In this work, we focus on gas-gas mixing through different micro/nanoscale mixers under slip and transitional flow regimes. We use the direct simulation Monte Carlo (DSMC) method to provide accurate and reliable results in such flow regimes. To extend our study, we implement different geometrical parameters in our consideration including the mixer size, the impact angle between two incoming gas streams, and the contraction height located in the flow passage. Generally, our study indicates that the mass flow rate and relative mixing length would reduce as the mixer size decreases; however, the latter one would approach a limiting value. Additionally, using a higher impact angle or a smaller contraction height would decrease both mixing length and mass flow rate values. We also investigate the effects of replacing a micromixer with an assembly of smaller micro/nanomixers on the general performance of mixing. The outcomes are properly discussed in the results and conclusion sections
  6. Keywords:
  7. Flow rate ; Gases ; Geometry ; Mass transfer ; Mixers (machinery) ; Monte Carlo methods ; Transition flow ; Direct simulation Monte Carlo ; Gas-mixing ; Micro/nanoflow ; Micro/nanomixer ; Mixing channel ; Mixing length ; Mixing
  8. Source: Sensors and Actuators, B: Chemical ; Volume 218 , October , 2015 , Pages 78-88 ; 09254005 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0925400515004463