Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 319-330 |
| Number of pages | 12 |
| Journal | International Journal of Thermal Sciences |
| Volume | 135 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
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Keywords
- Constructal
- Drainage
- Dropwise condensation
- Hydrophilic paths
- Non-condensable gases
- Patterned surfaces
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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.K. (Corresponding author).
In: International Journal of Thermal Sciences, Vol. 135, 01.01.2019, p. 319-330.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Experimental condensation study of vertical superhydrophobic surfaces assisted by hydrophilic constructal-like patterns
AU - Oestreich, J.
AU - van der Geld, C.W.M.
AU - Goes Oliveira, J.L.
AU - Da Silva, A.K.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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.
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.
KW - Constructal
KW - Drainage
KW - Dropwise condensation
KW - Hydrophilic paths
KW - Non-condensable gases
KW - Patterned surfaces
UR - http://www.scopus.com/inward/record.url?scp=85054069421&partnerID=8YFLogxK
U2 - 10.1016/j.ijthermalsci.2018.09.024
DO - 10.1016/j.ijthermalsci.2018.09.024
M3 - Article
VL - 135
SP - 319
EP - 330
JO - International Journal of Thermal Sciences
JF - International Journal of Thermal Sciences
SN - 1290-0729
ER -