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Experimental Study of an Electrospray and It's Application in Gaseous Cross Flow

Rahbari, Nina | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48080 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Morad, Mohammad Reza
  7. Abstract:
  8. The purpose of this project is investigating the effect of cross flow and electric field on a liquid simple-jet experimentally. In this research the effect of parameters such as liquid to air momentum ratio, electric field on jet trajectory, penetration and the lenght of breakup point with respect to the jet outlet were studied. The air was produced by a blower in a duct with square test section of 8 cm sides. The air velocity varied from 1 m/s to 11 m/s. Liquid ethanol was injected into the duct with a needle with outer diameter of 0/62 mm and inner diameter of 0.4 mm and 28 mm length. The velocity of jet was 0/62 m/s while the change of liquid to air momentum ratio was from 3 to 260 The breakup mechanism in low and high voltages was observed to be Rayleigh and whipping breakup respectively. The effect of parameters such as the momentum ratio, voltage, geometry of electrodes and their distance from needle were studied. Shadowgraphy was used to acquire images and the results indicate that the momentum ratio has an important role in determining the jet trajectory. With increasing the momentum ratio, the deflection of the jet trajectory decreases, the height of breakup point increases and the length of breakup point decreases. In presence of electric field with increasing the applying voltage, the deflection of the jet trajectory increases, the height of breakup point decreases and length of breakup point increases. The electric field and the jet trajectory were a function of the electrode distance from the tip of the needle. Finally correlations were obtained for the jet trajectory with and without electric field
  9. Keywords:
  10. Electrospray ; Cone-Jet ; Jet Trajectory ; Jet into Cross Flow Interaction ; Break up Point

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