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

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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].

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Authors and Affiliations

  1. IR4TD, Mechanical Engineering Department, University of Kentucky, Lexington, KY, 40506, USA

    Sadegh Poozesh, Nelson Akafuah & Kozo Saito

Authors
  1. Sadegh Poozesh
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  2. Nelson Akafuah
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  3. Kozo Saito
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Correspondence to Sadegh Poozesh.

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Poozesh, S., Akafuah, N. & Saito, K. New criteria for filament breakup in droplet-on-demand inkjet printing using volume of fluid (VOF) method. Korean J. Chem. Eng. 33, 775–781 (2016). https://doi.org/10.1007/s11814-015-0197-5

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  • DOI: https://doi.org/10.1007/s11814-015-0197-5

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