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Drop impact on hot plates: contact times, lift-off and the lamella rupture

Title
Drop impact on hot plates: contact times, lift-off and the lamella rupture
Authors
Lee, Sang-HyeonHarth, KirstenRump, Maaike김민우Lohse, DetlefFezzaa, KamelJe, Jung Ho
Date Issued
2020-09
Publisher
ROYAL SOC CHEMISTRY
Abstract
When a liquid drop impacts on a heated substrate, it can remain deposited, or violently boil in contact, or lift off with or without ever touching the surface. The latter is known as the Leidenfrost effect. The duration and area of the liquid-substrate contact are highly relevant for the heat transfer, as well as other effects such as corrosion. However, most experimental studies rely on side view imaging to determine contact times, and those are often mixed with the time until the drop lifts off from the substrate. Here, we develop and validate a reliable method of contact time determination using high-speed X-ray imaging and total internal reflection imaging. We exemplarily compare contact and lift-off times on flat silicon and sapphire substrates. We show that drops can rebound even without formation of a complete vapor layer, with a wide range of lift-off times. On sapphire, we find a local minimum of lift-off times that is much shorter than expected from capillary rebound in the comparatively low-temperature regime of transition boiling/thermal atomization. We elucidate the underlying mechanism related to spontaneous rupture of the lamella and receding of the contact area.
URI
https://oasis.postech.ac.kr/handle/2014.oak/105566
ISSN
1744-683X
Article Type
Article
Citation
SOFT MATTER, vol. 16, no. 34, page. 7935 - 7949, 2020-09
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제정호JE, JUNG HO
Dept of Materials Science & Enginrg
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