Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Internal flow visualization of an evaporating droplet placed on heated metal plate

가열된 금속표면에 놓인 증발하는 액적의 내부유동 가시화

  • Park, Chang-Seok (School of Mechanical Engineering, Pusan National University) ;
  • Lim, Hee-Chang (School of Mechanical Engineering, Pusan National University)
  • Received : 2016.11.09
  • Accepted : 2017.02.25
  • Published : 2017.04.30
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Abstract

This study aims to visualize the Marangoni flow inside a droplet placed on heated hydrophobic surface and to measure its internal velocity field. The experimental result shows that the internal velocity increases with the increase of the plate temperature. In addition, the temperature difference induces the initial flow and drives the Marangoni circulation inside the droplet as soon as the evaporation starts (i.e. the thermal Marangoni flow). The fluorescence particles in the droplet trace two large-scale counter-rotating vortex pairs yielding the downwards flow along the vertical central axis. These vortex pairs gradually become small and move towards the contact line as time goes by, and this Marangoni flow sustains only for a half of the total evaporation time.

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References

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