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Numerical optimization of three-cavity magneto mercury reciprocating (MMR) micropump

Mehrabi, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1080/19942060.2021.2000502
  3. Publisher: Taylor and Francis Ltd , 2021
  4. Abstract:
  5. The operation of the three-cavity magneto mercury reciprocating (MMR) micropump, whose prototype were presented in an earlier companion paper, was numerically explored. In the three-cavity MMR micropump, three mercury slugs are moved by a periodic Lorentz force with a phase difference in three separate cavities. A consecutive motion of the slugs in their cavities transfer air from the inlet to the outlet. Two-dimensional OpenFOAM simulations were carried out to explore the influence of electric current excitation phase difference and back-pressure. The numerical simulations predicted the MMR micropump (with no valve) with a phase difference of (Formula presented.) and (Formula presented.) produces a mean pumping flow rate of 2.7 and 6.1 mL/min at a back-pressure of 10 Pa and maintains a maximum back-pressure of 17.8 and 20 Pa, respectively. However, it was found that there was a reverse flow at large back-pressures with an excitation phase difference of (Formula presented.). The numerical results showed that employing a diffuser/nozzle valve with a length of 5 mm and an angle of (Formula presented.) improves the mean flow rate of the micropump with a phase difference of (Formula presented.) at a back-pressure of 10 Pa by 140% from 2.7 to 6.5 mL/min, and its maximum back-pressure by 125% from 17.8 to 40 Pa. © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group
  6. Keywords:
  7. Micropumps ; OpenFOAM ; VOF ; Diffuser/nozzle valve ; Lorentz force ; Magnetohydrodynamics (MHD)
  8. Source: Engineering Applications of Computational Fluid Mechanics ; Volume 15, Issue 1 , 2021 , Pages 1954-1966 ; 19942060 (ISSN)
  9. URL: https://www.tandfonline.com/doi/full/10.1080/19942060.2021.2000502