Colloquium

  • Marangoni Effects on Coating and Material Transport (마랑고니 효과를 이용한 코팅과 물질전달)

  • Speaker : 김형수 / Hyoungsoo Kim
    Affiliation : Department of Mechanical Engineering, KAIST
    Date : December 6, 2017 4:00 PM
    Place : Building 110 Room N103
    Contact : jjeong@unist.ac.kr
    Host : Joonwoo Jeong
  • Abstract

  • The surface tension of liquid is a physical property at the liquid interface, which results from the attraction of liquid molecules each other along the air-liquid interface. The surface tension could be altered by temperature, solute, and surfactant. This effect has been extensively studying since the 19th century. Although the Marangoni effects are used for various applications in nature and technology, there are still some missing puzzles to understand the mechanisms.

    In this talk, I will present a series of new features of Marangoni effects on coating, spreading and mixing. The problems are investigated using flow visualization techniques, which enable discoveries that are key to puzzling questions in fluid dynamics. The examples include that (i) spontaneous sequential Marangoni instabilities and surface-adsorbable macromolecules for uniform coatings inspired by the drying of whisky, (ii) self-assembled non-iridescent nanostructures using polymer and Marangoni effects, and (iii) a finite spreading and mixing of fully miscible liquids. These problems characterize my approach of using optical measurement techniques to explore new questions in multiphase flows and physicochemical hydrodynamics.