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Numerical Simulation of Rotary Magnetohydrodynamic Micropump

Abdollahi Mofakham, Amir | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42830 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad
  7. Abstract:
  8. First by reviewing some built micropumps, the importance of rotary magnetohydrodynamic micropump has been highlighted. Then some information about the performance and rules applied to these specific micropumps has been provided. Based on the research, the necessity of using transient flow relations for analyzing the procedure of these micropumps would become crucial. The next step would be extracting the information out of dimensionlessrelations of magnetohydrodynamic theory and dimension less equations of momentum in transientsingle-phase fluid flow which is moved by theoverall Lorentzforce in between 2 parallel surfaces. It would be done in two state of using constantcurrent source and constantpotential. Then the relations would be solved by using analytical method. After finding the analytical conclusions for these two MHD flows, influential parameters of these flows such as Hartmannnumber would be considered. After solving the equations, a solution would be suggested for using obtained relations for the biphasic which is located in the same geometry of one of those phases under theLorentzforce. The accuracy of obtained relations would be examined by comparison of conclusions and numerical Solution done by Fluent software. The next step after a complete understanding of MHD issues is going for anetworkofmicropumps geometry by using Gambit software and simulating it by Fluent software in a constant current source. Its key dimensions such as input, output and valve dimension of micropumpswould be examined by looking at its function in magnetic and electric fields. After clarifying the key dimensions, the results and the analytical ones for biphasic flows would be compared to make sure about the accuracy of them. After that, other effective factors on its function such as the dimension ofmagnetic and electric fields, contact angle of mercury and also surface tension dimension would be considered. Based on the studies, valve output dimension would be related to the mercury speed and also the present magnetic and electric fields. The next conclusion would be that the surfaces which mercury has the connection angle bigger than 90 degree are better choices for using in micropumps. Materials with surface tension like mercury or bigger than could be used in magnetic fields equal to 0.2 T and electric field equal to 2.5 A.

  9. Keywords:
  10. Micropumps ; Modeling ; Lorentz Force ; Mercury ; Magnetohydrodynamic ; Lorentz Force ; Surface Tension ; Contact Angle

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