From Bouncing to Floating: The Leidenfrost Effect with Hydrogel Spheres

Waitukaitis, Scott; Harth, Kirsten; Hecke, Martin van

doi:10.1103/physrevlett.121.048001

Cited by 16 publications

(10 citation statements)

References 24 publications

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“…Our observations are reminiscent of the rapid vibrations that appear at the base of soft sublimable solids and liquid drops, as contact occurs with a hot substrate during an impact (Khavari & Tran 2017; Waitukaitis et al. 2017; Waitukaitis, Harth & Van Hecke 2018). Oscillations can also spontaneously develop, without contact, at the bottom interface of drops in the static Leidenfrost state (Liu & Tran 2020; Bouillant et al.…”

Section: Transition From Levitation To Contactmentioning

confidence: 80%

Drop impact on superheated surfaces: short-time dynamics and transition to contact

Chantelot

Lohse

2021

J. Fluid Mech.

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When a volatile drop impacts on a superheated solid, air drainage and vapour generation conspire to create an intermediate gas layer that delays or even prevents contact between the liquid and the solid. In this article, we use high-speed synchronized reflection interference and total internal reflection imaging to measure the short-time dynamics of the intermediate gas film and to probe the transition between levitation and contact. We observe that the substrate temperature strongly affects the vertical position of the liquid–gas interface and that the dynamic Leidenfrost transition is influenced by both air and vapour drainage (i.e. gas drainage), and evaporation, the latter giving rise to hitherto unreported vertical oscillations of the gas film that can trigger liquid–solid contact. We first derive scaling relations for the height of the gas film trapped under the drop's centreline, called the dimple height, and the minimum film thickness at short times. The former is set by a competition between gas drainage and liquid inertia, similarly as for isothermal impacts, while the latter strongly depends on the vapour production. The gas pressure, at the location where the minimum thickness is reached, is determined by liquid inertia and vapour production and ultimately balanced by the increasing interfacial curvature, determining the minimum thickness. We show that, in the low impact velocity limit, the transient stability of the draining gas film remarkably makes dynamic levitation less demanding than static levitation. We characterize the vertical gas film oscillations by measuring their frequency and monitoring their occurrence in the parameter space spanned by surface temperature and impact velocity. Finally, we model the occurrence of these oscillations and account for their frequency through a hydrodynamic mechanism.

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Section: Transition From Levitation To Contactmentioning

confidence: 80%

Drop impact on superheated surfaces: short-time dynamics and transition to contact

Chantelot

Lohse

2021

J. Fluid Mech.

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“…Although mostly studied with water drops, the Leidenfrost effect can also be observed with stiff sublimable solids, e.g., dry ice [6][7][8][9]. Recently, it was found that hydrogel balls, that is, vaporizable soft solids, float above a hot surface similar to a drop of water when gently deposited [10] but bounce persistently when dropped onto the hot surface [11].…”

Section: Introductionmentioning

confidence: 99%

Granular Leidenfrost effect in microgravity

2020

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When a container filled with granular material is subjected to vertical vibration in the presence of gravity, under certain conditions a non-monotonous density profile can be observed. This effect which is characteristic for dissipative granular gases, was termed “floating cluster regime” or “granular Leidenfrost effect”. Here, we study the behavior of vibro-agitated granular matter in the absence of gravity and identify a corresponding stationary state of the granulate, that is, we provide experimental evidence of the granular Leidenfrost effect under conditions of weightlessness.

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“…Untuk menahan partikel bermuatan agar kecepatan rata-rata tetap digunakan kecepatan hanyut. Kecepatan hanyut (243)(244)(245)(246)(247) mempunyai arah sama dengan medan listrik dan hubungan keduanya dinyatakan dalam suatu konstanta yang disebut dengan mobilitas.…”

Section: Kecepatan Hanyutunclassified

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

Yuliani¹,

Zainul²

2018

Preprint

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Magnesium sulfat merupakan salah satu garam anorganik dengan rumus kimia MgSO4. Magnesium sulfat ini termasuk senyawa ionik karena terdapat ikatan antara logam magnesium dengan spesi non logam sulfat. Magnesium sulfat bersifat polar, bentuk anhidratnya sangat higroskopik dan mudah memiliki koordinasi dengan air. Umumnya magnesium sulfat terbentuk dalam formasi hidrat MgSO4.xH2O. Penelitian ini bertujuan untuk menganalisis pengaruh sifat termodinamika molekul MgSO4 terhadap interaksi molekuler di dalam senyawa tersebut. Metode yang digunakan ialah pemodelan dengan aplikasi ChemOffice 15.0. Sedangkan untuk data mobilitas ion, konduktivitas, viskositas, kecepatan hanyut dengan menggunakan perhitungan dan data dari hasil review beberapa jurnal penelitian yang berkaitan dengan magnesium sulfat sesuai tahapan yang tertera pada fishbond. Magnesium sulfat memiliki sifat termokimia dalam fasa solid dengan ∆𝐻𝑓,∆𝐺𝑓,𝑆°, 𝑑𝑎𝑛 𝐶𝑝 pada tekanan 1 atm dan suhu 25°C yang masing-masing mempunyai nilai -1284,9 kJ/mol, -1170,7 kJ/mol, 91,6 J/molK dan 96,48 J/molK. Mobilitas ion Mg2+dan SO42- adalah 5,50.10-8m2s-1V-1 dan 8,29.108m2s-1V-1. Panas reaksi standar (ΔHr°) MgSO4 bernilai negatif maka reaksi bersifat eksotermis

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From Bouncing to Floating: The Leidenfrost Effect with Hydrogel Spheres

Cited by 16 publications

References 24 publications

Drop impact on superheated surfaces: short-time dynamics and transition to contact

Drop impact on superheated surfaces: short-time dynamics and transition to contact

Granular Leidenfrost effect in microgravity

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

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