Temperature dependent droplet impact dynamics on flat and textured surfaces

Droplet impact dynamics determines the performance of surfaces used in many applications such as anti-icing, condensation, boiling, and heat transfer. We study impact dynamics of water droplets on surfaces with chemistry/texture ranging from hydrophilic to superhydrophobic and across a temperature r...

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Bibliographic Details
Published in:Applied physics letters 2012-03, Vol.100 (11), p.111601-111601-4
Main Authors: Alizadeh, Azar, Bahadur, Vaibhav, Zhong, Sheng, Shang, Wen, Li, Ri, Ruud, James, Yamada, Masako, Ge, Liehui, Dhinojwala, Ali, Sohal, Manohar
Format: Article
Language:English
Subjects:
BOILING
Droplet impact, superhydrophobic, wetting
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
FLUID-STRUCTURE INTERACTIONS
FREEZING
HEAT TRANSFER
SUBSTRATES
TEMPERATURE DEPENDENCE
VISCOSITY
WATER
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Summary:Droplet impact dynamics determines the performance of surfaces used in many applications such as anti-icing, condensation, boiling, and heat transfer. We study impact dynamics of water droplets on surfaces with chemistry/texture ranging from hydrophilic to superhydrophobic and across a temperature range spanning below freezing to near boiling conditions. Droplet retraction shows very strong temperature dependence especially on hydrophilic surfaces; it is seen that lower substrate temperatures lead to lesser retraction. Physics-based analyses show that the increased viscosity associated with lower temperatures combined with an increased work of adhesion can explain the decreased retraction. The present findings serve as a starting point to guide further studies of dynamic fluid-surface interaction at various temperatures.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3692598