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Effect of surface wettability on dynamic behaviors and freezing mechanisms of water droplets impacting cold surfaces
ID
Shang, Yuheng
(
Author
),
ID
Može, Matic
(
Author
),
ID
Tansu Aksoy, Yunus
(
Author
),
ID
Castagne, Sylvie
(
Author
),
ID
Seveno, David
(
Author
),
ID
Golobič, Iztok
(
Author
),
ID
Vetrano, Maria Rosaria
(
Author
)
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https://pubs.aip.org/aip/pof/article-abstract/36/9/092004/3311177/Effect-of-surface-wettability-on-dynamic-behaviors?redirectedFrom=fulltext
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Abstract
Droplet impacting and freezing on solid surfaces are ubiquitous in nature and crucial to many industrial applications, while the underlying mechanism of this phenomenon remains elusive. In this paper, the effect of surface wettability on dynamic behaviors and freezing mechanism of a water droplet impacting on a solid substrate at a fixed Weber number of 200 has been experimentally investigated at various surface temperatures from −35.2 to −10 °C. With the decrease in temperature of the superhydrophobic surface, the complete rebound behavior moves to partial rebound and ultimately to full adhesion, mainly due to the competition between the fluid dynamics and heat transfer processes. An intense prompt splashing is achieved by altering the surface wettability toward superhydrophobicity. Raising the water repellency enhances the lift of the lamella rim during the initial droplet spreading. The receding velocity on superhydrophobic surfaces is about ten times larger than that on hydrophobic surfaces, while it is barely affected by the surface and droplet temperatures. Three distinct freezing shapes are observed in the experiments, namely, spherical ice, irregular ice, and central cap ice, and those can be explained through the analysis of the differences between the time for the onset of freezing and receding time. Some cases of droplet freezing after full receding, also known as spherical ice, include two freezing stages. First, the liquid–gas interface freezes within a short period. Next, the remaining liquid freezes upward because the evaporation through the liquid–gas interface leads to the temperature of this interface being lower than the liquid–surface interface temperature. A phase diagram described by the final equilibrium contact factor and the surface temperature reveals the conditions to form different freezing processes or to remain a liquid state.
Language:
English
Keywords:
phase transitions
,
heat transfer
,
infrared imaging
,
ultrahydrophobicity
,
gas liquid interfaces
,
hydrophobic effect
,
fluid dynamics
,
droplet rebound
,
droplet freezing
,
superhydrophobicity
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Author Accepted Manuscript
Year:
2024
Number of pages:
22 str.
Numbering:
Vol. 36, iss. 9, [article no.] 092004
PID:
20.500.12556/RUL-161445
UDC:
532:536.2
ISSN on article:
1070-6631
DOI:
10.1063/5.0222155
COBISS.SI-ID:
207081987
Publication date in RUL:
11.09.2024
Views:
27
Downloads:
30
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Record is a part of a journal
Title:
Physics of fluids
Shortened title:
Phys. fluids
Publisher:
American Institute of Physics
ISSN:
1070-6631
COBISS.SI-ID:
37828865
Secondary language
Language:
Slovenian
Keywords:
fazni prehodi
,
prenos toplote
,
infrardeča termografija
,
ultrahidrofobnost
,
fazna meja plin-kapljevina
,
hidrofobni učinek
,
dinamika fluidov
,
odboj kapljic
,
zmrzovanje kapljic
,
superhidrofobnost
Projects
Funder:
Other - Other funder or multiple funders
Funding programme:
KU Leuven Internal funding, China Scholarship Council
Project number:
AKUL/17
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
J2-50085
Name:
Raziskave medfaznih pojavov kapljic in mehurčkov na funkcionaliziranih površinah ob uporabi napredne diagnostike za razvoj okoljskih tehnologij prihodnosti in izboljšanega prenosa toplote (DroBFuSE)
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0223
Name:
Prenos toplote in snovi
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