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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Format: | Article |
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MDPI AG
2022-02-01
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Series: | Fluids |
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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. |
first_indexed | 2024-03-09T21:59:14Z |
format | Article |
id | doaj.art-0b3dee4741654388a33db216b4c22aa6 |
institution | Directory Open Access Journal |
issn | 2311-5521 |
language | English |
last_indexed | 2024-03-09T21:59:14Z |
publishDate | 2022-02-01 |
publisher | MDPI AG |
record_format | Article |
series | Fluids |
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 |
work_keys_str_mv | AT minorishirota rimbreakupsofimpactingdropsonasuperhydrophobicsurfaceandasuperheatedsurface AT masakikato rimbreakupsofimpactingdropsonasuperhydrophobicsurfaceandasuperheatedsurface AT aiishio rimbreakupsofimpactingdropsonasuperhydrophobicsurfaceandasuperheatedsurface |