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.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.