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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 51178 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Morad, Mohammad Reza
- Abstract:
- Liquid jet behavior in an intense electric field is studied experimentally and numerically.Imaging is used in experiments to charactrize jet behavior. Electrospray of ethanol using a simple needle in a wide range of operating conditions is investigated. Liquid meniscus is captured using a high-speed camera and different electrospray modes are described based on involved forces. A new nozzle is invented that broadens the stability margins of the useful cone-jet mode. The physical mechanisms of the new cone-jet is discussed and it is characterized using appropriate dimensionless parameters. A simple jet in presence of a gaseous crossflow and a normal electric field is also studied. The liquid jet and droplets flight path is quantified as a function of jet to crossflow momentum ratio and electroinertial numbers. The liquid jet breakup length is predicted analytically and the results are validated with experiments. It is found that increasing electrical bond and aerodynamic Weber numbers decreases breakup length. A code is developed on the basis of the interFoam open source solver, which can numerically simulate electrohydrodynamic flows. Bench-mark electrohydrodynamic problems were used for code validation and then the code is used successfully for simulation of dripping and cone-jet modes. Physics of the cone-jet mode is discused using simulation results
- Keywords:
- Electrohydrodynamic ; Electrospray ; Cone-Jet ; Numerical Simulation ; Experimental Studies
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