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Onset of Marangoni Convection in a Ternary Mixture with Surfactant  

김제익 (서울대학교 응용화학부)
강용태 (경희대학교 기계산업시스템공학부)
최창균 (서울대학교 응용화학부)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.15, no.11, 2003 , pp. 964-969 More about this Journal
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
Absorption; Surface tension; Marangoni convection; Surfactant;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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