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Near-wall fluid flow near the pinned contact line during droplet evaporation.pdf
Experimental Thermal and Fluid Science 72 (2016) 210–217
Contents lists available at ScienceDirect
Experimental Thermal and Fluid Science
journal homepage: /locate/etfs
Near-wall ?uid ?ow near the pinned contact line during droplet evaporation
Congjie Xiao, Leping Zhou ?, Zhuo Sun, Xiaoze Du, Yongping Yang
School of Energy, Power and Mechanical Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
article info
Article history: Received 28 August 2015 Received in revised form 8 November 2015 Accepted 10 November 2015 Available online 2 December 2015
Keywords: Droplet evaporation Pinned contact line Near-wall Velocimetry Thin ?lm thickness
abstract
Drop evaporation is a fundamental and complex phenomenon in nature and industrial processes. For the case of pinned contact line mode, however, we still lack a comprehensive understanding of the near-wall ?uid ?ow during drop evaporation. In this paper, we measure the in-plane average velocities near the pinned contact line during evaporation of deionized water and aqueous ethanol solutions by the multilayer nano-particle image velocimetry (MnPIV) technique. The results show that the Marangoni convection near the triple-phase contact line is negligible for the ?ow pattern during the natural evaporation process without heat source being applied. The near-wall velocity pro?les experience the decrease of thin ?lm thickness just before the droplet shrinking process. The thin ?lm thickness in the ethanol solution appears to decrease earlier than that in deionized water and the total shrinking time is much shorter than water. The thin ?lm thickness decreases linearly before decreasing exponentially in about the ?rst 100 nm. The transition time also becomes earlier for the high-concentration solutions due to higher evaporation ?ux, while the transition thickness is larger for ethanol solutions with higher conc
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