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Electrohydrodynamic Stability of a Cylindrical Jet under an Axial Electric Field

Gholamzadeh, Hassan | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51518 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kebriaee, Azadeh; Morad, Mohammad Reza
  7. Abstract:
  8. Due to the large application of electro-sprays in various industries, the study of the stability of electro-hydrodynamic flows is important. This thesis examines the stability of cylindrical liquid jets in the presence of an axial electric field. The definition of this jet is a simplified model of electrospray, electrospinning. In this model, the stability of a free incompressible cylindrical flow with surface tensile strength, conductivity, polarization, viscosity, and dielectric constant is determined, irrespective of the solubility of the jet and the surrounding fluid (air), in the presence of uniform axial electric field has taken. This will be done by adding the forces generated by the electric field to the equations and using the theory of perturbation and the obtained electrohydrodynamic equations have been solved to the dispersion relation. The effect of electric field and fluid and flow parameters in whipping and varicose modes have been studied and the growth rate of these instabilities has been determined as a function of fluid and field variables. Then, using the resulting relations, the boundary between the varicose and kink instabilities in the nozzle with the half-spherical head is calculated, and a relationship is presented for calculating the current, and finally, the reason for increasing the cone jet mode operating range in this nozzle is discussed
  9. Keywords:
  10. Electrospray ; Stability ; Varicose ; Whipping ; Linear Time Instability ; Viscous Fluid ; Axial Electric Field ; Electrohydrodynamic

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