Experimental condensation study of vertical superhydrophobic surfaces assisted by hydrophilic constructal-like patterns

J. Oestreich, C.W.M. van der Geld, J.L. Goes Oliveira, A. Da Silva

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The effect of hydrophilic constructal-like patterns on the condensate mass flow rate production of superhydrophobic vertical test sections is discussed. The surface patterning, which presents a branching topology, is obtained by coating selected areas of the condensation surface with a commercial product. In total, five different designs were tested, three with a branched topology having coated/clear area fractions of approximately 30%, 50% and 70%, in addition to fully clear and fully coated test sections. The condensation performance of each test section was measured in the presence of non-condensable gases inside a climate-controlled chamber, which allowed independent adjustment of its internal temperature and humidity. Condensation measurements indicate that for some cases, averaged improvements ranged between 7.4% and 17.5% when a test section with an area fraction of 70% is compared with clear and fully coated surfaces, respectively, considering the climate-controlled chamber is kept with a relative humidity of nearly 80%. Additionally, a qualitative image-based analysis of the condensation process revealed that the superhydrophobic/hydrophilic interface arguably aids the droplet detachment and could, potentially, guide/direct the draining flow in real systems.
LanguageEnglish
Pages319-330
JournalInternational Journal of Thermal Sciences
Volume135
DOIs
StatePublished - 1 Jan 2019

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Condensation
condensation
climate
humidity
Atmospheric humidity
topology
chambers
Topology
noncondensable gases
mass flow rate
drainage
detachment
condensates
adjusting
Flow rate
coatings
Coatings
products
Gases
Temperature

Cite this

@article{c428a75bb5bc4ed791945231bd413bc0,
title = "Experimental condensation study of vertical superhydrophobic surfaces assisted by hydrophilic constructal-like patterns",
abstract = "The effect of hydrophilic constructal-like patterns on the condensate mass flow rate production of superhydrophobic vertical test sections is discussed. The surface patterning, which presents a branching topology, is obtained by coating selected areas of the condensation surface with a commercial product. In total, five different designs were tested, three with a branched topology having coated/clear area fractions of approximately 30{\%}, 50{\%} and 70{\%}, in addition to fully clear and fully coated test sections. The condensation performance of each test section was measured in the presence of non-condensable gases inside a climate-controlled chamber, which allowed independent adjustment of its internal temperature and humidity. Condensation measurements indicate that for some cases, averaged improvements ranged between 7.4{\%} and 17.5{\%} when a test section with an area fraction of 70{\%} is compared with clear and fully coated surfaces, respectively, considering the climate-controlled chamber is kept with a relative humidity of nearly 80{\%}. Additionally, a qualitative image-based analysis of the condensation process revealed that the superhydrophobic/hydrophilic interface arguably aids the droplet detachment and could, potentially, guide/direct the draining flow in real systems.",
author = "J. Oestreich and {van der Geld}, C.W.M. and {Goes Oliveira}, J.L. and {Da Silva}, A.",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.ijthermalsci.2018.09.024",
language = "English",
volume = "135",
pages = "319--330",
journal = "International Journal of Thermal Sciences",
issn = "1290-0729",
publisher = "Elsevier Masson SAS",

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Experimental condensation study of vertical superhydrophobic surfaces assisted by hydrophilic constructal-like patterns. / Oestreich, J.; van der Geld, C.W.M.; Goes Oliveira, J.L.; Da Silva, A.

In: International Journal of Thermal Sciences, Vol. 135, 01.01.2019, p. 319-330.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

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AU - van der Geld,C.W.M.

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PY - 2019/1/1

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AB - The effect of hydrophilic constructal-like patterns on the condensate mass flow rate production of superhydrophobic vertical test sections is discussed. The surface patterning, which presents a branching topology, is obtained by coating selected areas of the condensation surface with a commercial product. In total, five different designs were tested, three with a branched topology having coated/clear area fractions of approximately 30%, 50% and 70%, in addition to fully clear and fully coated test sections. The condensation performance of each test section was measured in the presence of non-condensable gases inside a climate-controlled chamber, which allowed independent adjustment of its internal temperature and humidity. Condensation measurements indicate that for some cases, averaged improvements ranged between 7.4% and 17.5% when a test section with an area fraction of 70% is compared with clear and fully coated surfaces, respectively, considering the climate-controlled chamber is kept with a relative humidity of nearly 80%. Additionally, a qualitative image-based analysis of the condensation process revealed that the superhydrophobic/hydrophilic interface arguably aids the droplet detachment and could, potentially, guide/direct the draining flow in real systems.

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