Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface

The rim breakup of an impacting drop is experimentally investigated by comparing the impacts on superheated and superhydrophobic surfaces. The objective of the present study is to experimentally examine whether the <i>Bo</i> = 1 criteria holds for the rim breakups of drops impacting on t...

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Main Authors: Minori Shirota, Masaki Kato, Ai Ishio
Format: Article
Language:English
Published: MDPI AG 2022-02-01
Series:Fluids
Subjects:
Online Access:https://www.mdpi.com/2311-5521/7/2/79
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author Minori Shirota
Masaki Kato
Ai Ishio
author_facet Minori Shirota
Masaki Kato
Ai Ishio
author_sort Minori Shirota
collection DOAJ
description The rim breakup of an impacting drop is experimentally investigated by comparing the impacts on superheated and superhydrophobic surfaces. The objective of the present study is to experimentally examine whether the <i>Bo</i> = 1 criteria holds for the rim breakups of drops impacting on the surfaces. A transparent sapphire plate was heated to achieve the Leidenfrost impact, which enables us to observe with a high-speed camera from below. The characteristics of the rim breakup were evaluated quantitatively using a particle tracking velocimetry method for both the rim and the drops generated. As a result, we clarified that <i>Bo</i> of the rim increases in the spreading phase and marks the highest value of 0.5 on a superheated surface, which is smaller than that on a pillar, where <i>Bo</i> ≈ 1. On a superhydrophobic surface, the highest <i>Bo</i> was 1.2, which is smaller than that on a wettable solid surface, 2.5, but close to the value on a pillar. We also revealed that diameters of generated drops collapse on a master curve when plotted as a function of pinch-off time for both the impacts on superheated and superhydrophobic surfaces.
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spelling doaj.art-0b3dee4741654388a33db216b4c22aa62023-11-23T19:52:36ZengMDPI AGFluids2311-55212022-02-01727910.3390/fluids7020079Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated SurfaceMinori Shirota0Masaki Kato1Ai Ishio2Graduate School of Science and Technology, Hirosaki University, 3 Bunkyocho, Hirosaki 0368561, Aomori, JapanGraduate School of Science and Technology, Hirosaki University, 3 Bunkyocho, Hirosaki 0368561, Aomori, JapanGraduate School of Science and Technology, Hirosaki University, 3 Bunkyocho, Hirosaki 0368561, Aomori, JapanThe rim breakup of an impacting drop is experimentally investigated by comparing the impacts on superheated and superhydrophobic surfaces. The objective of the present study is to experimentally examine whether the <i>Bo</i> = 1 criteria holds for the rim breakups of drops impacting on the surfaces. A transparent sapphire plate was heated to achieve the Leidenfrost impact, which enables us to observe with a high-speed camera from below. The characteristics of the rim breakup were evaluated quantitatively using a particle tracking velocimetry method for both the rim and the drops generated. As a result, we clarified that <i>Bo</i> of the rim increases in the spreading phase and marks the highest value of 0.5 on a superheated surface, which is smaller than that on a pillar, where <i>Bo</i> ≈ 1. On a superhydrophobic surface, the highest <i>Bo</i> was 1.2, which is smaller than that on a wettable solid surface, 2.5, but close to the value on a pillar. We also revealed that diameters of generated drops collapse on a master curve when plotted as a function of pinch-off time for both the impacts on superheated and superhydrophobic surfaces.https://www.mdpi.com/2311-5521/7/2/79drop impactLeidenfrosthydrophobicrim breakupunsteady atomization
spellingShingle Minori Shirota
Masaki Kato
Ai Ishio
Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
Fluids
drop impact
Leidenfrost
hydrophobic
rim breakup
unsteady atomization
title Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
title_full Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
title_fullStr Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
title_full_unstemmed Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
title_short Rim Breakups of Impacting Drops on a Superhydrophobic Surface and a Superheated Surface
title_sort rim breakups of impacting drops on a superhydrophobic surface and a superheated surface
topic drop impact
Leidenfrost
hydrophobic
rim breakup
unsteady atomization
url https://www.mdpi.com/2311-5521/7/2/79
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AT masakikato rimbreakupsofimpactingdropsonasuperhydrophobicsurfaceandasuperheatedsurface
AT aiishio rimbreakupsofimpactingdropsonasuperhydrophobicsurfaceandasuperheatedsurface