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Study on Motion of Electrical Conductor Fluid Plug Actuated Electromagnetically in Microsystems

Karmozdi, Mohsen | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53463 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohmmad Behshad; Afshin, Hossein
  7. Abstract:
  8. Micropumps are regarded as one of the devices used in microsystems, which are responsible for pumping working fluid. The Mercury Magneto Reciprocating (MMR) micropump, which has been introduced for less than a decade, is an innovative kind of micropumps which the pumping agent includes three liquid metal droplets (LMD) placed inside lateral chambers and reciprocated by the electromagnetic force inside the chambers. The working fluid located inside the main channel is pumped through due to the movement of these three LMDs. The equations governing this micropump are complex and their numerical solution is a time-consuming process, due to electromagnetic, hydrodynamic, and unsteady effects. The time duration in which the LMD traverses the chamber length is crucial in the operation of the MMR micropump. The present study aims to evaluate the effect of the length of chambers, LMD size and the actuation force on the LMD movement duration by imaging an LMD movement and analyzing the experimental results. Then, it will be shown that all results can be collapsed on one curve by nondimensionalizing the results and defining an appropriate characteristic time. An empirical equation is presented for prediction of a droplet scrolling time, using the length of chambers, LMD volume and the amount of actuation force. Next, for the first time, using simplifying assumptions, the performance of an MMR micropump with electromagnetic actuation is studied through electrical analogy and then, the components and operational stages of the micropump are simulated using a lumped element method with an equivalent electric circuit, while calculating its currents and potentials. Then, the characteristic curves of this micropump are extracted as a function of head and the flow rate and the results of the proposed modeling are verified by laboratory results. Finally, the effect of geometric parameters and the actuation frequency on the micropump performance is studied. The results of modeling indicate that an increase in the volume of the liquid droplet chamber, as well the actuation frequency could improve the performance of this micropump
  9. Keywords:
  10. Experimental Investigation ; Lorentz Force ; Electrical Analogy ; Liquid Metal Droplets (LMD) ; Mercury Magneto Reciprocating Micropump ; Liquid Metal Droplet Motion in Channel

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