Producing droplets smaller than the nozzle diameter by using a pneumatic drop-on-demand droplet generator

Producing droplets smaller than the nozzle diameter by using a pneumatic drop-on-demand droplet... A pneumatic droplet generator to produce water/glycerin droplets smaller than the nozzle diameter is described. The generator consists of a T-junction with a nozzle fit into one opening, the second opening connected to a gas cylinder through a solenoid valve and the third connected to a length of steel tubing. The droplet generator is filled with liquid. Opening the valve for a preset time creates a pulse of alternating negative and positive pressure in the gas above the surface of the liquid, ejecting a single droplet through the nozzle. Droplet formation was photographed and the pressure variation in the droplet generator recorded. The effect of various experimental parameters, such as nozzle size, pressure pulse width and liquid properties on droplet formation was investigated. Small droplets could not be generated when liquid viscosity was too low or too high. For pure water, droplet diameters were several times that of the nozzle. Using more viscous glycerin mixtures, droplets with diameters as small as 65% of the nozzle diameter could be produced. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Producing droplets smaller than the nozzle diameter by using a pneumatic drop-on-demand droplet generator

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Publisher
Springer-Verlag
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-007-0378-z
Publisher site
See Article on Publisher Site

Abstract

A pneumatic droplet generator to produce water/glycerin droplets smaller than the nozzle diameter is described. The generator consists of a T-junction with a nozzle fit into one opening, the second opening connected to a gas cylinder through a solenoid valve and the third connected to a length of steel tubing. The droplet generator is filled with liquid. Opening the valve for a preset time creates a pulse of alternating negative and positive pressure in the gas above the surface of the liquid, ejecting a single droplet through the nozzle. Droplet formation was photographed and the pressure variation in the droplet generator recorded. The effect of various experimental parameters, such as nozzle size, pressure pulse width and liquid properties on droplet formation was investigated. Small droplets could not be generated when liquid viscosity was too low or too high. For pure water, droplet diameters were several times that of the nozzle. Using more viscous glycerin mixtures, droplets with diameters as small as 65% of the nozzle diameter could be produced.

Journal

Experiments in FluidsSpringer Journals

Published: Aug 28, 2007

References

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