Chu, F, Wen, D orcid.org/0000-0003-3492-7982 and Wu, X (2018) Frost Self-Removal Mechanism during Defrosting on Vertical Superhydrophobic Surfaces: Peeling Off or Jumping Off. Langmuir, 34 (48). pp. 14562-14569. ISSN 0743-7463
Abstract
Although a superhydrophobic surface has great potential to delay frosting, it tends to become frosted under humid conditions and needs to defrost periodically. So far, the exact mechanism of defrosting still remains unclear. Here, we investigate the frost self-removal mechanism during defrosting on vertical superhydrophobic surfaces. Two self-removal modes are observed: peeling off and jumping off. When the frost thickness is larger than a threshold value, peeling off mode occurs; otherwise, jumping off mode takes place. Compared with the peeling off mode, the jumping off mode is less effective in self-removing frost as jumping is limited by energy transformation. A theoretical model based on frost melting–water permeation mechanism is proposed to determine the threshold value of frost thickness. According to this model, the threshold value of the frost thickness is dependent on the frost porosity and the surface temperature (or heat flux). For our particular experiments, the threshold value of the frost thickness predicted by the proposed model agrees well with our experimental results. Our work may advance the defrosting applications of superhydrophobic surfaces in related engineering fields.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright © 2018 American Chemical Society. This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Lamgmuir, after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.langmuir.8b03347. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Dec 2018 12:20 |
Last Modified: | 26 Oct 2019 00:39 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.langmuir.8b03347 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:139508 |