期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 34, 期 8, 页码 1488-1497出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2010.07.013
关键词
Drop-on-demand; Liquid jet; Droplet formation; Jet break-up; Oscillating liquid flow
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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.
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