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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Onset of Marangoni Convection in a Ternary Mixture with Surfactant

계면활성제가 포함된 삼성분계 해석을 통한 마란고니 대류 발생 연구

  • 김제익 (서울대학교 응용화학부) ;
  • 강용태 (경희대학교 기계산업시스템공학부) ;
  • 최창균 (서울대학교 응용화학부)
  • Published : 2003.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of this study is to investigate the effect of surfactant on the onset of Marangoni convection adapting a non-linear surface equation of state. The surface tension gradient with respect to the absorbate concentration, ${\gamma}$, is linearly related to the surface concentration of a surfactant with a coeffcient $x_{A}$. The numerical results show that the role of the initial surfactant concentration to Marangoni instability changes from the stabilizer to the destabilizer depending on the change of the sign of $x_{A}$ from negative to positive. It is concluded that for $x_{A}$>0 there is a critical modified Marangoni number of surfactant $M_{Ac}$ $^{*}$ above which liquid layer is always unstable against long wave disturbances.rbances.

Keywords

References

  1. Int. J. Refrig. v.19 Heat transfer enhancement by additives Ziegler,F.;Grossman,G.
  2. Int. J. Refrig. v.22 Viaualization and model development of Marangoni convection in NH₃-H₂O system Kang,Y.T.;Akisawa,A.;Kashiwagi,T.
  3. Chem. Eng. Sci. v.50 Effect of heat transfer additives on the instabilities of an absorbing falling film Ji,W.;Setterwall,F.
  4. Korean J. Air-Conditioning and Refrigeration Eng. v.15 no.2 Instability analysis of Marangoni convection for NH₃/H₂O absorption process accompanied by heat transfer Kim,J.;Choi,C.K.;Kang,Y.T.
  5. ISHPC'99, Proc. of Int. Sorption Heat Pump Conf. Dynamic surface tension of LiBr-solutions with higher alcohols as heat-transfer-additives Kren,Ch.;Hellmann,H.M.;Ziegler,F.
  6. ISHPC'02, Proc. of Int. Sorption Heat Pump Conf. The vapor surfactant theory of absorption and condensation enhancement Zhou,X.;Herold,K.E.
  7. Int. J. Refrig. v.22 Absorption of water vapour into lithium bromide-based solutions with additives using a simple stagnant pool absorber Kim,J.S.;Lee,H.;Yu,I.S.
  8. ISHPC'99, Proc. of Int. Sorption Heat Pump Conf. Additive-induced enhancement of heat and mass transfer in a static absorber: A numerical study Koenig,M.S.;Grossman,G.;Gommed,K.
  9. Colloids and Surfaces A v.100 Adsorption dynamics of surfactants at the air/water interface: a critical review of mathematical models, data, and mechanism Chang,C.H.;Franses,E.I.