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- In relation to this article, we declare that there is no conflict of interest.
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Received May 22, 2015
Accepted September 16, 2015
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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New criteria for filament breakup in droplet-on-demand inkjet printing using volume of fluid (VOF) method
IR4TD, Mechanical Engineering Department, University of Kentucky, Lexington, KY 40506, U.S.A., USA
sadegh.poozesh@gmail.com
Korean Journal of Chemical Engineering, March 2016, 33(3), 775-781(7), 10.1007/s11814-015-0197-5
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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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Castrejon-Pita AA, Castrejon-Pita JR, Martin GD, Rev. Sci. Instrum., 83, 115105 (2012)
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Chen AU, Basaran OA, Phys. Fluids, 14, L1 (2002)
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Dong H, Carr WW, Morris JF, Phys. Fluids, 18, 072102 (2006)
Castrejon-Pita AA, Castrejon-Pita JR, Hutchings IM, Phys. Rev. Lett., 108, 074506 (2012)
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Emori R, Saito K, Sekimoto K, Tokyo, Japan: Gihodo. Second Print in (2008).
