Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 34, Issue 8, Pages 1488-1497Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2010.07.013
Keywords
Drop-on-demand; Liquid jet; Droplet formation; Jet break-up; Oscillating liquid flow
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
Ask authors/readers for more resources
A pneumatic droplet generator is described in which a gas pulse of alternating negative and positive pressure is applied on liquid in a nozzle, driving a periodic motion of the free liquid surface. An analytic model of incompressible liquid motion in the nozzle demonstrates that the motion of the surface is out of phase with the exciting pressure oscillation. A jet of liquid issues far enough out of the nozzle that its tip becomes unstable, detaches and forms a droplet. Experiments showed the oscillation of the liquid surface prior to droplet ejection and the time lag between the pressure oscillation and droplet ejection. The model predicts that maximum liquid velocity is attained at an intermediate value of viscosity, and experiments confirmed that the largest liquid motion was achieved with this intermediate value, which eventually leads to droplet formation. By varying the duration of the pressure pulse droplets smaller than the nozzle diameter could be produced. (c) 2010 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available