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Numerical Simulation of Magneto Mercury Reciprocating Micropump

Mehrabi, Ali | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45331 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. In this investigation Magneto Mercury Reciprocating Micrpump (MMRM) the combination of Magneto-Hydrodynamic and Reciprocating micropumps has been analyzed. To achieve the analytical and numerical solution of one-tank and three-tank MMRM, the momentum, continuity, volume fraction and magnetohydrodynamic equations have been presented. The dimensionless analytical solution of one-phase and two-phase three dimensional MHD flow in the condition of using constant current and potential electrical source, has been offered.
    The boundary between mercury and air has been tracked via VOF method in OpenFOAM software. VOF equation has been solved by explicit method with variable time step and maximum value courant number of 0.2. PISO algorithm has been used to solve the coupled pressure and velocity equations. To validate the mentioned methods, the Rayleigh-Taylor problem has been simulated and the results were in harmony with pervious works.
    The results from numerical simulation of dynamic movement of two-phase flow (mercury and air) in 2D and 3D channels have been compared to analytical solution as a validation. The maximum relative error between the mentioned two solutions for step function of Lorentz force case was about 7.93 percent. According to operation of one-tank MMRM, after several simulations, a 2.5 mm and 20 degree nozzle-diffuser has been recommended for inlet and outlet of this type of micropump. Based on experimental considerations, analytical results, and Self Pumping Frequency (SPF), the dimensions of this micropump has been specified. Maximum volume flowrate of 2.3102 mlit/min and maximum head of 1.76 Pa have been resulted from numerical simulation. By refining the current micropump to a two-air-channel one-tank MMRM, the volume flowrate has been increased about twofold.
    For three-tank MMRM, a phase difference of 90 degree between electrical currents of consecutive tanks has been selected as the optimal choice. With this phase difference, maximum volume flowrate of 8.499 mlit/min and maximum head of 17.8179 Pa have been obtained. In the case of using two nozzle-diffusers in inlet and outlet section of this micropump, a dramatic improvement has been occurred in volume flowrate
  9. Keywords:
  10. Micropumps ; Mercury ; Magnetohydrodynamic ; OpenFOAM Software ; Volume of Fluid

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