Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Simulation of Hydro-Acoustic Flow in Piezo Inkjet Print Head

피에조 잉크젯 헤드의 음향파 거동의 수치 해석

  • 이유섭 (삼성종합기술원 Micro Sysems Lab.) ;
  • 위상권 (삼성종합기술원 Micro Sysems Lab.) ;
  • 오세영 (삼성종합기술원 Micro Sysems Lab.) ;
  • 정재우 (삼성종합기술원 Micro Sysems Lab.)
  • Published : 2007.01.01
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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.

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References

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