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Numerical Simulation of Electrospray with Presence of Cone-Jet

Ghate Ghushchi, Mehran | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47167 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Morad, Mohammad Reza
  7. Abstract:
  8. In this work, the cone-jet mode of electrospray is simulated by a two phase solver in OpenFoam software. For this aim firstly, breakup of a liquid jet is examined without applying any electric potential to the injecting capillary and results are compared with other works to evaluate the two phase solver. Next with applying electric potential, the whole evolution of cone-jet in time is simulated. One of the most important issues in this mode is the minimum potential that needs to form a stable cone-jet in different flow rates. These minimum voltages are obtained in various flow rates and compared with other experimental and computational works. Result shows that with increasing flow rate the minimum voltage decreases. The diameter of jet that forms after the apex of cone is so smaller than the jet without applying voltage to the capillary, so the charged droplets emitted from the apex of capillary are so finer. This feature and the ability to control diameter of droplets with applied voltages and flow rates, make cone-jet so useful. The calculated droplet diameter agrees well with experimental measurement. Result indicates that for low conductivity liquids, heptane in this work, the droplet diameter decreases with the increment of applied voltage, but decreases with the reduction of flow rate
  9. Keywords:
  10. Electrospray ; Volume of Fluid ; Electrohydrodynamic ; OpenFOAM Software ; Cone-Jet

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