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정나리나(Narina Jung),서해원(Hae Won Seo),김필원(Pilwon Kim),유춘상(Chun Sang Yoo) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Evaporation of a colloidal droplet typically leaves ring-like deposit patterns on a substrate, now well-known as the coffee ring effect. We investigate the effect of surfactants on the deposit formation in a drying droplet. A coarse grained model has been developed to simulate kinetics of surfactants, and the related deposit formation at the contact line. The model can successfully generate stable surfactant-induced Marangoni eddies which shows a good agreement with recently-reported experiments. We show that adsorption rate and electrostatic repulsion are key factors to generate Marangoni eddies. The effects of surfactants are further investigated by systematically varying adsorption rates, strengths of repulsion, and initial concentrations of surfactants.
Hae Won Seo(서해원),Narina Jung(정나리나),Chun Sang Yoo(유춘상) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Two-dimensional (2-D) characteristic boundary conditions (CBC) based on the characteristic analysis are formulated for the lattice Boltzmann methods (LBM). In this approach, the classical locally-one dimensional inviscid (LODI) relations are improved by recovering multi-dimensional effects on flows at open boundaries. The 2-D CBC are extended to a general subsonic flow configuration in the LBM and the effects of the transverse terms are clarified. From the vortex convection and vortex shedding problems, it is verified that the improved CBC shows better performance in accuracy compared to the conventional CBC approaches.