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Title: Triple condensate halo from a single water droplet impacting upon a cold surface
Authors: Zhao, Yugang
Zhu, Fangqi
Zhang, Hui
New, Tze How
Jin, Liwen
Yang, Chun
Keywords: Thermal Diffusion
DRNTU::Engineering::Mechanical engineering
Optical Imaging
Issue Date: 2019
Source: Zhao, Y., Zhu, F., Zhang, H., New, T. H., Jin, L., & Yang, C. (2019). Triple condensate halo from a single water droplet impacting upon a cold surface. Applied Physics Letters, 114(18), 183703-. doi:10.1063/1.5080356
Series/Report no.: Applied Physics Letters
Abstract: Understanding the dynamics of water droplets impacting upon a solid surface is of importance from both fundamental and practical standpoints. While the impact dynamics of a water droplet upon a heated surface has been extensively studied, the impact characteristics of droplets upon a cold surface remain elusive. Here, we report the formation of a triple condensate halo observed during a water droplet impacting at low velocity upon a cold surface. Due to the interplay of droplet impact and vapor mass diffusion during the droplet spreading and cooling processes, two condensation stages occur, engendering this unique condensate halo with three distinctive bands. We further examine experimentally the effects of droplet impact velocity (in terms of Weber number) and substrate temperature on the three bands of condensate halo. We also provide scaling analyses to explain the experimental results. Our experimental investigation and theoretical analysis reported in this study reveal insights into the droplet impact dynamics and the associated condensation heat transfer.
ISSN: 0003-6951
DOI: 10.1063/1.5080356
Rights: © 2019 The Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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