Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Perturbation Analysis of a Meandering Rivulet

섭동법을 이용한 만곡 리뷸릿에 관한 이론적 연구

  • 김진호 (한국과학기술연구원 열·유동제어연구센터) ;
  • 김호영 (한국과학기술연구원 열·유동제어연구센터) ;
  • 강병하 (국민대학교 기계·자동차공학부) ;
  • 이재헌 (한양대학교 공과대학 기계공학부)
  • Published : 2001.12.01
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Abstract

The rivulet is a narrow stream of liquid flowing down a solid surface. When the rivulet\`s flow rate exceeds a certain limit, it tends to meander exhibiting the instability of its interface. This analysis performs a perturbation analysis of this meandering rivulet assuming an inviscid flow possessing contact angle hysteresis at the contact line. The analysis reveals that the contact angle hysteresis as well as the velocity difference across the inter-face, strongly induces the instability of the liquid interface. Moreover, when the rivulet veto-city is low, it is predicted that the axisymmetric disturbance amplifies more rapidly than the anti-axisymmetric disturbance, which explains the emergence of the droplet flow at the low velocity regime.

Keywords

References

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