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Scaling laws for pulsed electrohydrodynamic drop formation C.-H. Chen, D. A. Saville, and I. A. Aksaya
 

Summary: Scaling laws for pulsed electrohydrodynamic drop formation
C.-H. Chen, D. A. Saville, and I. A. Aksaya
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
Received 22 August 2005; accepted 23 August 2006; published online 20 September 2006
A pulsed electrohydrodynamic jet can produce on-demand drops much smaller than the delivery
nozzle. This letter describes an experimentally validated model for electrically pulsed jets. Viscous
drag in a thin nozzle limits the flow rate and leads to intrinsic pulsations of the cone jet. A scale
analysis for intrinsic cone-jet pulsations is derived to establish the operating regime for drop
deployment. The scaling laws are applicable to similar electrohydrodynamic processes in
miniaturized electrospraying systems. 2006 American Institute of Physics.
DOI: 10.1063/1.2356891
Among contemporary techniques for drop generation,
pulsed electrohydrodynamic EHD jetting may be the only
one that can produce drops on demand with dimensions a
decade or so smaller than the nozzle.1,2
The large neck-down
ratio derives from the EHD cone-jet transition produced by
an external voltage pulse.3
This transition is fundamental to
electrospray ionization4

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University
Chen, Chuan-Hua - Department of Mechanical Engineering and Materials Science, Duke University

 

Collections: Engineering; Materials Science