NDLI: Measurement of the oscillatory flow field inside tapered cylindrical inkjet nozzles using micro-particle image velocimetry

Content Provider	Springer Nature Link
Author	Cheng, E. Ahmadi, A. Cheung, K. C.
Copyright Year	2015
Abstract	The flow field within a tapered, cylindrical, piezoelectrically actuated glass inkjet nozzle is captured using fluorescence micro-PIV (μPIV) assisted by a novel, custom-designed PDMS micro-fabricated nozzle holder and a microsecond-resolution cyclic triggering system. The presented work overcomes key imaging challenges such as distortion from the refractive index mismatched curved glass–air interface and the typically large depth of field/correlation found in inkjet imaging set-ups. The PDMS holder permits fluorescence imaging of the seeded flow tracing particles with minimal distortion as the holder is refractive-index-matched with the glass nozzle. The cyclic triggering system allows visualization of the transient phases of a periodic droplet ejection event. The system utilizes an inverted microscope with an objective lens capable of producing a low depth of correlation of 12.25 µm. Double-frame images for µPIV were acquired beginning from the onset of droplet formation to study the flow field evolution during droplet formation and after droplet break-off. An oscillatory flow field was observed within the nozzle during the droplet ejection process which closely correlates with modelling results.
Starting Page	635
Ending Page	646
Page Count	12
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	19
Issue Number	3
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-05-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inkjet Micro-particle image velocimetry Oscillatory flow field Hydrodynamics Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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