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http://dx.doi.org/10.3795/KSME-B.2007.31.1.051

Numerical Simulation of Hydro-Acoustic Flow in Piezo Inkjet Print Head  

Lee, You-Seop (삼성종합기술원 Micro Sysems Lab.)
Wee, Sang-Kwon (삼성종합기술원 Micro Sysems Lab.)
Oh, Se-Young (삼성종합기술원 Micro Sysems Lab.)
Chung, Jae-Woo (삼성종합기술원 Micro Sysems Lab.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.1, 2007 , pp. 51-61 More about this Journal
Abstract
This paper presents numerical and theoretical studies of acoustic wave interactions in slightly compressible liquids within piezoelectrically driven inkjet print heads. The interconnected flow channels may cause jet crosstalk, resulting in poor printing quality. It should be reduced by modifying the channel structure with the acoustic wave interactions considered. Compressible gas flow driven by the sudden movement of a top wall in the channel is calculated using Flow3D and is validated with the narrow gap theory. Limited compressibility model of the Flow3D is employed to calculate pressure waves of slightly compressible ink flow. It is found that reducing restrictor width can damp out the jet crosstalk by inhibiting the pressure wave propagation. The degree of crosstalk has been quantified using the maximum values of cross-correlations between neighboring channels and a critical channel dimension for acceptable crosstalk has been proposed. This finding is verified by drop visualization experiments using silicon-micromachined piezo inkjet print heads that are fabricated by our group.
Keywords
Piezo Inkjet; Acoustic Wave; Narrow Gap Theory; Limited Compressibility Model; Crosstalk;
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