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. / Graduation date: 2004
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/31051 |
| Date | 04 December 2003 |
| Creators | Yang, Guozhong |
| Contributors | Liburdy, James A. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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