Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability

The jumping-droplet phenomenon occurring on superhydrophobic (SHPhob) surfaces under special conditions may be beneficial for numerous systems using condensation, due to the reported increased heat transfer coefficients. One technique to create a SHPhob surface is coating, which can be applied to la...

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Autores principales:	Nataliia Fedorova, Christian Lindner, Lucia Helena Prado, Vojislav Jovicic, Ana Zbogar-Rasic, Sannakaisa Virtanen, Antonio Delgado
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	condensation heat transfer steam flow rate superhydrophobicity coating stability contact angle Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e1148caac62b434b8430f94d03faa792
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id	oai:doaj.org-article:e1148caac62b434b8430f94d03faa792
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spelling	oai:doaj.org-article:e1148caac62b434b8430f94d03faa7922021-11-25T18:50:47ZEffect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability10.3390/pr91119582227-9717https://doaj.org/article/e1148caac62b434b8430f94d03faa7922021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1958https://doaj.org/toc/2227-9717The jumping-droplet phenomenon occurring on superhydrophobic (SHPhob) surfaces under special conditions may be beneficial for numerous systems using condensation, due to the reported increased heat transfer coefficients. One technique to create a SHPhob surface is coating, which can be applied to larger areas of existing elements. However, challenges are associated with coating stability and the realization of continuous dropwise condensation. This research examined the condensation of steam at different flow rates (2, 4 and 6 g/min) and its influence on heat flux and water contact angles on the SHPhob spray-coated aluminum samples. Special emphasis on the impact of time was addressed through a series of one and five-hour condensation experiments on the samples with different storage periods (coated either one year ago or shortly before testing). Over the experimental series at a higher steam flow rate (6 g/min), heat flux decreased by 20% through the old-coated samples and water contact angles transferred from the superhydrophobic (147°) to hydrophobic (125°) region. This can be attributed to the joint effects of the partial coating washout and the adsorption of the condensed water within the porous structures of the coating during steam condensation. The new-coated samples could sustain more than fifty hours of condensation, keeping the same heat fluxes and SHPhob characteristics.Nataliia FedorovaChristian LindnerLucia Helena PradoVojislav JovicicAna Zbogar-RasicSannakaisa VirtanenAntonio DelgadoMDPI AGarticlecondensation heat transfersteam flow ratesuperhydrophobicitycoatingstabilitycontact angleChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1958, p 1958 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	condensation heat transfer steam flow rate superhydrophobicity coating stability contact angle Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	condensation heat transfer steam flow rate superhydrophobicity coating stability contact angle Chemical technology TP1-1185 Chemistry QD1-999 Nataliia Fedorova Christian Lindner Lucia Helena Prado Vojislav Jovicic Ana Zbogar-Rasic Sannakaisa Virtanen Antonio Delgado Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
description	The jumping-droplet phenomenon occurring on superhydrophobic (SHPhob) surfaces under special conditions may be beneficial for numerous systems using condensation, due to the reported increased heat transfer coefficients. One technique to create a SHPhob surface is coating, which can be applied to larger areas of existing elements. However, challenges are associated with coating stability and the realization of continuous dropwise condensation. This research examined the condensation of steam at different flow rates (2, 4 and 6 g/min) and its influence on heat flux and water contact angles on the SHPhob spray-coated aluminum samples. Special emphasis on the impact of time was addressed through a series of one and five-hour condensation experiments on the samples with different storage periods (coated either one year ago or shortly before testing). Over the experimental series at a higher steam flow rate (6 g/min), heat flux decreased by 20% through the old-coated samples and water contact angles transferred from the superhydrophobic (147°) to hydrophobic (125°) region. This can be attributed to the joint effects of the partial coating washout and the adsorption of the condensed water within the porous structures of the coating during steam condensation. The new-coated samples could sustain more than fifty hours of condensation, keeping the same heat fluxes and SHPhob characteristics.
format	article
author	Nataliia Fedorova Christian Lindner Lucia Helena Prado Vojislav Jovicic Ana Zbogar-Rasic Sannakaisa Virtanen Antonio Delgado
author_facet	Nataliia Fedorova Christian Lindner Lucia Helena Prado Vojislav Jovicic Ana Zbogar-Rasic Sannakaisa Virtanen Antonio Delgado
author_sort	Nataliia Fedorova
title	Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
title_short	Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
title_full	Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
title_fullStr	Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
title_full_unstemmed	Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability
title_sort	effect of steam flow rate and storage period of superhydrophobic-coated surfaces on condensation heat flux and wettability
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e1148caac62b434b8430f94d03faa792
work_keys_str_mv	AT nataliiafedorova effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT christianlindner effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT luciahelenaprado effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT vojislavjovicic effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT anazbogarrasic effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT sannakaisavirtanen effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability AT antoniodelgado effectofsteamflowrateandstorageperiodofsuperhydrophobiccoatedsurfacesoncondensationheatfluxandwettability
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Effect of Steam Flow Rate and Storage Period of Superhydrophobic-Coated Surfaces on Condensation Heat Flux and Wettability

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