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Zhao SC, Zhang HJ, Li Y. Cold granular targets slow the bulk freezing of an impacting droplet. Proc Natl Acad Sci U S A 2024; 121:e2311930121. [PMID: 38175861 PMCID: PMC10786308 DOI: 10.1073/pnas.2311930121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 11/20/2023] [Indexed: 01/06/2024] Open
Abstract
When making contact with an undercooled target, a drop freezes. The colder the target is, the more rapid the freezing is supposed to be. In this research, we explore the impact of droplets on cold granular material. As the undercooling degree increases, the bulk freezing of the droplet is delayed by at least an order of magnitude. The postponement of the overall solidification is accompanied by substantial changes in dynamics, including the spreading-retraction process, satellite drop generation, and cratering in the target. The solidification of the wetted pores in the granular target primarily causes these effects. The freezing process over the pore dimension occurs rapidly enough to match the characteristic timescales of impact dynamics at moderate undercooling degrees. As a result, the hydrophilic impact appears "hydrophobic," and the dimension of the solidified droplet shrinks. A monolayer of cold grains on a surface can reproduce these consequences. Our research presents a potential approach to regulate solidified morphology for subfreezing drop impacts. It additionally sheds light on the impact scenario of strong coupling between the dynamics and solidification.
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Affiliation(s)
- Song-Chuan Zhao
- Department of Engineering Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an710049, China
| | - Hao-Jie Zhang
- Department of Engineering Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an710049, China
| | - Yudong Li
- Department of Engineering Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an710049, China
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Lolla VY, Ahmadi SF, Park H, Fugaro AP, Boreyko JB. Arrested Dynamics of Droplet Spreading on Ice. PHYSICAL REVIEW LETTERS 2022; 129:074502. [PMID: 36018702 DOI: 10.1103/physrevlett.129.074502] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 03/17/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
We investigate the arrested spreading of room temperature droplets impacting flat ice. The use of an icy substrate eliminates the nucleation energy barrier, such that a freeze front can initiate as soon as the droplet's temperature cools down to 0 °C. We employ scaling analysis to rationalize distinct regimes of arrested hydrodynamics. For gently deposited droplets, capillary-inertial spreading is halted at the onset of contact line freezing, yielding a 1/7 scaling law for the arrested diameter. At low impact velocities (We≲100), inertial effects result in a 1/2 scaling law. At higher impact velocities (We>100), inertio-viscous spreading can spill over the frozen base of the droplet until its velocity matches that of a kinetic freeze front caused by local undercooling, resulting in a 1/5 scaling law.
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Affiliation(s)
| | - S Farzad Ahmadi
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
- Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA
| | - Hyunggon Park
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Andrew P Fugaro
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Jonathan B Boreyko
- Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
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Zeng X, Yan Z, Lu Y, Fu Y, Lv X, Yuan W, He Y. Reduction of Ice Adhesion Using Surface Acoustic Waves: Nanoscale Vibration and Interface Heating Effects. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11851-11858. [PMID: 34585928 DOI: 10.1021/acs.langmuir.1c01852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Ice accumulation causes great risks to aircraft, electric power lines, and wind-turbine blades. For the ice accumulation on structural surfaces, ice adhesion force is a crucial factor, which generally has two main sources, for exampple, electrostatic force and mechanical interlocking. Herein, we present that surface acoustic waves (SAWs) can be applied to minimize ice adhesion by simultaneously reducing electrostatic force and mechanical interlocking, and generating interface heating effect. A theoretical model of ice adhesion considering the effect of SAWs is first established. Experimental studies proved that the combination of nanoscale vibration and interface heating effects lead to the reduction of ice adhesion on the substrate. With the increase of SAW power, the electrostatic force decreases due to the increase of dipole spacings, which is mainly attributed to the SAW induced nanoscale surface vibration. The interface heating effect leads to the transition of the locally interfacial contact phase from solid-solid to solid-liquid, hence reducing the mechanical interlocking of ice. This study presents a strategy of using SAWs device for ice adhesion reduction, and results show a considerable potential for application in deicing.
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Affiliation(s)
- XingChang Zeng
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
- Xi'an Institute of Applied Optics, Xi'an 710072, P.R. China
| | - ZeXiang Yan
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - YuChao Lu
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - YongQing Fu
- Faculty of Engineering & Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, U.K
| | - XiangLian Lv
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - WeiZheng Yuan
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - Yang He
- Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education and Shaanxi Key Laboratory of Micro and Nano Electromechanical Systems, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China
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Starostin A, Strelnikov V, Valtsifer V, Lebedeva I, Legchenkova I, Bormashenko E. Robust icephobic coating based on the spiky fluorinated Al 2O 3 particles. Sci Rep 2021; 11:5394. [PMID: 33686094 PMCID: PMC7940413 DOI: 10.1038/s41598-021-84283-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/10/2021] [Indexed: 11/21/2022] Open
Abstract
Omniphobic and icephobic twin-scale surfaces based on the “urchin”-like fluorinated Al2O3 particles are presented. Combined effect of hierarchical topography and fluorination supplied to the surfaces omniphobic and icephobic properties. The study of the stability of the Cassie wetting state is reported. High apparent contact angles were accompanied with the low contact angle hysteresis and high stability of the Cassie air trapping wetting state. Time delay of the ice crystallization as high as \documentclass[12pt]{minimal}
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\begin{document}$$88\pm 5$$\end{document}88±5 min was established when compared to the ice formation on flat aluminum and non-fluorinated “urchin”-like surfaces. Crystallized water droplets formed on the reported nano-structured surfaces were easily blown out by the air jet with the velocity of \documentclass[12pt]{minimal}
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\begin{document}$$v=3.0\pm 1.0$$\end{document}v=3.0±1.0 m/s, (which is markedly lower than that common for exploitation of aircrafts and turbines). Heated “urchin”-like surfaces completely restored their omniphobic and icephobic surfaces after thawing. Qualitative analysis of water freezing is supplied.
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Affiliation(s)
- Anton Starostin
- Institute of Technical Chemistry, UB RAS, Academician Korolev St., 3, Perm, 614013, Russian Federation
| | - Vladimir Strelnikov
- Institute of Technical Chemistry, UB RAS, Academician Korolev St., 3, Perm, 614013, Russian Federation
| | - Viktor Valtsifer
- Institute of Technical Chemistry, UB RAS, Academician Korolev St., 3, Perm, 614013, Russian Federation
| | - Irina Lebedeva
- Institute of Technical Chemistry, UB RAS, Academician Korolev St., 3, Perm, 614013, Russian Federation
| | - Irina Legchenkova
- Engineering Faculty, Chemical Engineering Department, Ariel University, POB 3, 407000, Ariel, Israel
| | - Edward Bormashenko
- Engineering Faculty, Chemical Engineering Department, Ariel University, POB 3, 407000, Ariel, Israel.
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