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Volume: 27 | Article ID: art00024_1
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Ultra-High Speed Particle Image Velocimetry on Drop-on-Demand Jetting
  DOI :  10.2352/ISSN.2169-4451.2011.27.1.art00024_1  Published OnlineJanuary 2011
Abstract

An experimental setup to study the dynamics of droplet jetting from a commercially available print-head is described. A MicroFab print-head with an 80 μm diameter transparent nozzle was set to print droplets at a speed of 5 m/s at a frequency of 7 kHz. A Particle Image Velocimetry (PIV) scheme consisting of an optical microscope coupled to an ultra-high speed camera is utilized to capture the motion of particles suspended in a model transparent ink. This experimental arrangement images the flow at the centre of a glass cylindrical nozzle and above the fluid meniscus at a speed of half a million frames per second. Velocity fields are obtained from an approximately 200 μm thickness layer of fluid at the inside of the nozzle. Experimental results are compared with Lagrangian finite-element numerical simulations under identical fluid and jetting conditions with good agreement. The advantages, challenges and current limitations of this approach are discussed.

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José R. Castrejón-Pita, Stephen D. Hoath, Alfonso A. Castrejón-Pita, Neil F. Morrison, Wen-Kai Hsiao, Ian M. Hutchings, "Ultra-High Speed Particle Image Velocimetry on Drop-on-Demand Jettingin Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP27),  2011,  pp 93 - 96,  https://doi.org/10.2352/ISSN.2169-4451.2011.27.1.art00024_1

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