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Numerical investigation on the effect of external varying magnetic field on the mixing of ferrofluid with deionized water inside a microchannel for lab-on-chip systems

Saadat, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1080/15567036.2020.1728440
  3. Publisher: Taylor and Francis Inc , 2020
  4. Abstract:
  5. Energy-efficient mixing is vital for chemical and fuel processes. To this end, a flow-focusing configuration is proposed to investigate the effect of a uniform magnetic field on the mixing of a water-based ferrofluid with two streams of deionized water. An external and varying magnetic field is imposed on a straight microchannel, and the mixing between the ferrofluid and deionized waters is qualitatively and quantitatively measured. A commercial code based on the finite-element method is used, and the simulations are validated by two experimental studies in the literature. For a magnetic flux density of 10 mT, a signal frequency of 1 Hz, a duty cycle of 0.3, an inlet velocity of 500 µm/s, and a relative inlet velocity of 0.5, an excellent mixing efficiency as high as 97.4 % is achieved after 1.5 s of the magnetic actuation. This model benefits from its low implementation cost and can help augment and develop energy-efficient lab-on-chip platforms. © 2020, © 2020 Taylor & Francis Group, LLC
  6. Keywords:
  7. Ferrofluid ; Lab-on-chip ; Micromixing ; Energy efficiency ; Inlet flow ; Magnetic fluids ; Magnetohydrodynamics ; Microchannels ; Microfluidics ; Mixing ; Implementation cost ; Lab on chip ; Lab-on-chip systems ; Micro-mixing ; Numerical investigations ; Signal frequencies ; Straight microchannels ; Uniform magnetic fields ; Deionized water
  8. Source: Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; 2020
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/15567036.2020.1728440