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Time-dependent measurements of length and area of the contact line in contact-boiling regime

Published online by Cambridge University Press:  10 September 2021

Mohammad Khavari Open the ORCID record for Mohammad Khavari [Opens in a new window]  and
Tuan Tran Open the ORCID record for Tuan Tran [Opens in a new window]
Mohammad Khavari
Affiliation:
Faculty of Technology, Design and Environment, Oxford Brookes University, OxfordOX33 1HX, UK Department of Materials, University of Oxford, Parks Road, OxfordOX1 3PH, UK
Tuan Tran*
Affiliation:
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Republic of Singapore
*
†Email address for correspondence: ttran@ntu.edu.sg
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Abstract

During the impact of a liquid droplet on a sufficiently heated surface, bubble nucleation reduces the contact area between the liquid and the solid surface. Using high-speed imaging combined with total internal reflection, we measure and report how the contact area decreases with time for a wide range of surface temperatures and impact velocities. We also reveal how formation of the observed fingering patterns contributes to a substantial increase in the total length of the contact line surrounding the contact area.

JFM classification

Drops and Bubbles: Boiling Drops and Bubbles: Drops Drops and Bubbles: Bubble dynamics
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 926 , 10 November 2021 , R3
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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Khavari and Tran supplementary movie 1

Synchronized side and bottom-view recordings of impact of ethanol droplet on the heated surface for We = 591 and T = 200 C

Download Khavari and Tran supplementary movie 1(Video)
Video 7.4 MB

Khavari and Tran supplementary movie 2

TIR recordings of the wet area for different surface temperatures and the same We number (We = 591)

Download Khavari and Tran supplementary movie 2(Video)
Video 10.2 MB

Khavari and Tran supplementary movie 3

TIR recordings of fingering patterns at different We numbers and the same surface temperature (T = 220 C)

Download Khavari and Tran supplementary movie 3(Video)
Video 9.6 MB