Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A19: Heat Transfer, Evaporation and Buoyancy Effects I
8:00 AM–9:44 AM,
Sunday, November 19, 2023
Room: 146B
Chair: Zhenying Wang, Kyushu University
Abstract: A19.00004 : Hydrodynamic and thermal behavior of drops impacting hot surfaces near the Leidenfrost point*
8:39 AM–8:52 AM
Presenter:
Kentaro Tanii
(Kyushu University)
Authors:
Kentaro Tanii
(Kyushu University)
Yutaku Kita
(King's College London)
In this study, we employed a combination of temperature sensitive paint (TSP) and high-speed cameras, along with an infrared camera, to capture simultaneously the hydrodynamic and thermal behavior of drops impinging on heated surfaces near the Leidenfrost point. We used millimeter-sized drops of FC-72 as the test fluid and sapphire glass as the substrate.
So far, we have been successful in measuring drop impact behavior and accompanying heat transfer above and below the Leidenfrost point. This has enabled us to observe some interesting behavior of a drop which detached after a while with wavy motion. At the initial impact, we measured transient temperature distributions corresponding to nucleate boiling while no apparent thermal variation was visible once the vapor cushion was developed to hinder heat transfer. This was only observed in the presence of a TSP layer, which had a low thermal diffusivity, and not for a bare sapphire glass. Moreover, we found that even above the Leidenfrost point, the drop eventually came in contact with the substrate when it became sufficiently small. Further investigations are undergoing to elucidate the effects of thermal response of the substrate and drop size.
*The authors acknowledge the EC-RISE-ThermaSMART project. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 778104.
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