Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

Abstract Phase-change condensation is commonplace in nature and industry. Since the 1930s, it is well understood that vapor condenses in filmwise mode on clean metallic surfaces whereas it condenses by forming discrete droplets on surfaces coated with a promoter material. In both filmwise and dropwi...

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Autores principales:	Solomon Adera, Lauren Naworski, Alana Davitt, Nikolaj K. Mandsberg, Anna V. Shneidman, Jack Alvarenga, Joanna Aizenberg
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f6f99a7252e040bbb50e3e13b392c088
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spelling	oai:doaj.org-article:f6f99a7252e040bbb50e3e13b392c0882021-12-02T15:45:16ZEnhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes10.1038/s41598-021-90015-x2045-2322https://doaj.org/article/f6f99a7252e040bbb50e3e13b392c0882021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90015-xhttps://doaj.org/toc/2045-2322Abstract Phase-change condensation is commonplace in nature and industry. Since the 1930s, it is well understood that vapor condenses in filmwise mode on clean metallic surfaces whereas it condenses by forming discrete droplets on surfaces coated with a promoter material. In both filmwise and dropwise modes, the condensate is removed when gravity overcomes pinning forces. In this work, we show rapid condensate transport through cracks that formed due to material shrinkage when a copper tube is coated with silica inverse opal structures. Importantly, the high hydraulic conductivity of the cracks promote axial condensate transport that is beneficial for condensation heat transfer. In our experiments, the cracks improved the heat transfer coefficient from ≈ 12 kW/m2 K for laminar filmwise condensation on smooth clean copper tubes to ≈ 80 kW/m2 K for inverse opal coated copper tubes; nearly a sevenfold increase from filmwise condensation and identical enhancement with state-of-the-art dropwise condensation. Furthermore, our results show that impregnating the porous structure with oil further improves the heat transfer coefficient by an additional 30% to ≈ 103 kW/m2 K. Importantly, compared to the fast-degrading dropwise condensation, the inverse opal coated copper tubes maintained high heat transfer rates when the experiments were repeated > 20 times; each experiment lasting 3–4 h. In addition to the new coating approach, the insights gained from this work present a strategy to minimize oil depletion during condensation from lubricated surfaces.Solomon AderaLauren NaworskiAlana DavittNikolaj K. MandsbergAnna V. ShneidmanJack AlvarengaJoanna AizenbergNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Solomon Adera Lauren Naworski Alana Davitt Nikolaj K. Mandsberg Anna V. Shneidman Jack Alvarenga Joanna Aizenberg Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
description	Abstract Phase-change condensation is commonplace in nature and industry. Since the 1930s, it is well understood that vapor condenses in filmwise mode on clean metallic surfaces whereas it condenses by forming discrete droplets on surfaces coated with a promoter material. In both filmwise and dropwise modes, the condensate is removed when gravity overcomes pinning forces. In this work, we show rapid condensate transport through cracks that formed due to material shrinkage when a copper tube is coated with silica inverse opal structures. Importantly, the high hydraulic conductivity of the cracks promote axial condensate transport that is beneficial for condensation heat transfer. In our experiments, the cracks improved the heat transfer coefficient from ≈ 12 kW/m2 K for laminar filmwise condensation on smooth clean copper tubes to ≈ 80 kW/m2 K for inverse opal coated copper tubes; nearly a sevenfold increase from filmwise condensation and identical enhancement with state-of-the-art dropwise condensation. Furthermore, our results show that impregnating the porous structure with oil further improves the heat transfer coefficient by an additional 30% to ≈ 103 kW/m2 K. Importantly, compared to the fast-degrading dropwise condensation, the inverse opal coated copper tubes maintained high heat transfer rates when the experiments were repeated > 20 times; each experiment lasting 3–4 h. In addition to the new coating approach, the insights gained from this work present a strategy to minimize oil depletion during condensation from lubricated surfaces.
format	article
author	Solomon Adera Lauren Naworski Alana Davitt Nikolaj K. Mandsberg Anna V. Shneidman Jack Alvarenga Joanna Aizenberg
author_facet	Solomon Adera Lauren Naworski Alana Davitt Nikolaj K. Mandsberg Anna V. Shneidman Jack Alvarenga Joanna Aizenberg
author_sort	Solomon Adera
title	Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
title_short	Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
title_full	Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
title_fullStr	Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
title_full_unstemmed	Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
title_sort	enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f6f99a7252e040bbb50e3e13b392c088
work_keys_str_mv	AT solomonadera enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT laurennaworski enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT alanadavitt enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT nikolajkmandsberg enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT annavshneidman enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT jackalvarenga enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes AT joannaaizenberg enhancedcondensationheattransferusingporoussilicainverseopalcoatingsoncoppertubes
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Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

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