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Title: Freezing of a nanofluid droplet : from a pointy tip to flat plateau
Authors: Zhao, Yugang
Yang, Chun
Cheng, P.
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Zhao, Y., Yang, C. & Cheng, P. (2021). Freezing of a nanofluid droplet : from a pointy tip to flat plateau. Applied Physics Letters, 118(14), 141602-.
Project: MOE2016-T2-1-114
Journal: Applied Physics Letters
Abstract: Understanding the dynamics during freezing of nanofluid droplets is of importance from both fundamental and practical viewpoints. It is known that a universal pointy tip is formed on the top of a frozen water droplet [Marín et al., Phys. Rev. Lett. 113(5), 054301 (2014)]. Here, we report that the formation of a pointy tip is broken down due to the presence of nanoparticles; instead, the top of a frozen nanofluid droplet exhibits a flat plateau shape and such a plateau becomes larger at higher particle concentrations. We show that the phenomenon of such shape changes in freezing nanofluid droplets is universal, independent of contact angle, droplet volume, particle size, and particle material. We propose an analytical model to attribute the plateau formation to a capillary driven compensating flow due to segregated particles moving along the freezing interface.
ISSN: 0003-6951
DOI: 10.1063/5.0044935
Rights: © 2021 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: embargo_20220415
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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