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

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Study of Impact of Microdroplet Containing Nanoparticles

나노입자를 포함한 미세액적의 충돌에 대한 수치적 연구

  • Roh, Sang-Eun (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Son, Gi-Hun (Dept. of Mechanical Engineering, Sogang Univ.)
  • Received : 2011.12.22
  • Accepted : 2012.03.12
  • Published : 2012.06.01
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Abstract

The impact, spreading and recoil processes of a nanoparticle-laden droplet impacting on a horizontal solid surface are numerically investigated by solving the conservation equations for mass, momentum, energy and mass fraction. The liquid-air interface is tracked using a level-set method that is modified to include the effect of contact angle hysteresis at the wall. The species transport equation including a thermal diffusion term is additionaly solved to determine the nanoparticle distribution in the droplet. The effect of nanoparticle concentration and contact angle are also studied.

충돌, 퍼짐 및 수축을 포함한 나노입자 혼합 액적의 거동에 대한 수치모사를 수행하였다. 기체-액체 상경계면은 벽면에서의 접촉각 이력현상을 포함한 레벨셋 방법을 이용하여 해석하였다. 액적 내부의 나노입자 분포를 해석하기 위하여 물질의 열확산을 반영한 농도 방정식을 해석에 포함하였다. 수치해석 결과로부터 나노 입자의 분포는 온도의 불균일 분포에 크게 영향을 받는 것을 확인하였다. 나노입자의 농도 집중도에 의한 표면 장력 및 접촉각변화 효과에 대한 연구를 수행하였다.

Keywords

References

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