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

  • 제30권11호
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  • Pages.1107-1116
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  • 2006
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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버블 잉크젯에서의 기포성장 및 액적분사에 관한 수치적 연구

Numerical Study on Bubble Growth and Droplet Ejection in a Bubble Inkjet Printer

  • 서영호 (서강대학교 대학원 기계공학과) ;
  • 손기헌 (서강대학교 기계공학과)
  • 발행 : 2006.11.01
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초록

The droplet ejection process driven by an evaporating bubble in a thermal inkjet printhead is investigated by numerically solving the conservation equations for mass, momentum and energy. The phase interfaces are tracked by a level set method which is modified to include the effect of phase change at the interface and extended for multiphase flows with irregular solid boundaries. The compressibility effect of a bubble is also included in the analysis to appropriately describe the bubble expansion behaviour associated with the high pressure caused by bubble nucleation. The whole process of bubble growth and collapse as well as droplet ejection during thermal inkjet printing is simulated without employing a simplified semi-empirical bubble growth model. Based on the numerical results, the jet breaking and droplet formation behaviour is observed to depend strongly on the bubble growth and collapse pattern. Also, the effects of liquid viscosity, surface tension and nozzle geometry are quantified from the calculated bubble growth rate and ink droplet ejection distance.

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참고문헌

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