A numerical model of drop-on demand droplet formation from a vibrating nozzle and a rigid nozzle Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/b2773z616

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  • Droplet formation from a rigid and a vibration nozzle driven by a pulsing pressure is simulated. Droplet formation is simulated by using one-dimensional model. For the case of droplet formation from a vibration nozzle, the nozzle vibration is simulated by large deflection plate vibration equation. Droplet formation from a rigid nozzle is studied simply by setting the nozzle deflection always to be zero. The one-dimensional model is solved by MacCormack method. The large deflection plate vibration equation is solved by mode shape approximation and Runga--Kuta time integration method. Three different effect factors, the driving pressure thrust input effects, the fluid viscosity effects, and the nozzle vibration effects, on droplet formation are studied. The driving pressure thrust input effects and the fluid viscosity effects are studied based on a rigid nozzle. The nozzle vibration effects are studied by comparing the results from a vibration nozzle with the results from a rigid nozzle. Results show: 1) the primary droplet break-off time is constant if the driving pressure magnitude is high, but the primary droplet volume and primary droplet velocity increase slightly as the driving pressure thrust input increase; 2) higher thrust input can possibly result in the occurrence of overturn phenomenon; 3) increasing the fluid viscosity cause the primary droplet break-off later, but the primary droplet volume and the primary droplet velocity does not change significantly by fluid viscosity; 4) the nozzle vibration effect on the primary droplet break-off time and the primary droplet size is small, but the nozzle vibration cause the primary droplet velocity to increase by an amount of the nozzle vibration velocity magnitude; 5) nozzle vibration cause longer liquid thread to form and the total satellite droplet volume to increase significantly which eventually break into multiple satellite droplet.
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