New criteria for filament breakup in droplet-on-demand inkjet printing using volume of fluid (VOF) method

Sadegh Poozesh, Nelson Akafuah, Kozo Saito

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A volume of fluid (VOF) numerical study is presented in which new pi number-based criteria are discussed that identify and separate three different regimes for a droplet-on-demand (DOD) print-head system. A trailing filament coalesces into the main droplet while the filament breaks into one or multiple satellite droplet(s). The numerical simulation results are compared with published large-scale experimental results that used a 2 mm diameter inkjet nozzle head, roughly 50 times larger than the actual diameter of inkjet outlets. Liquid filament break-up behavior is predicted using a combination of two pi-numbers, including either Weber (We)-Ohnesorge (Oh) number couplets or Reynolds (Re)-Weber (We) number couplets that are dependent only on the ejected liquid properties and the velocity waveform at the print-head inlet. These new criteria have merit over the currently existing ones that require accurate measurements of actual droplets to determine filament physical features like length and diameter [1].

Original languageEnglish
Pages (from-to)775-781
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume33
Issue number3
DOIs
StatePublished - Mar 1 2016

Bibliographical note

Publisher Copyright:
© 2016, Korean Institute of Chemical Engineers, Seoul, Korea.

Keywords

  • Droplet on Demand
  • Filament Breakup
  • Inkjet Printing
  • Scale Modelling
  • Volume of Fluid (VOF)

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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