NDLI: Effects of Ambient Air Relative Humidity and Surface Temperature on Water Droplet Spreading Dynamics

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Effects of Ambient Air Relative Humidity and Surface Temperature on Water Droplet Spreading Dynamics

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jadidi, M. Farzad, M. A. Trepanier, J. Y. Dolatabadi, A.
Copyright Year	2018
Abstract	Water droplet impact on horizontal glass, aluminum, and superhydrophobic surfaces is experimentally investigated using high speed imaging. Experiments are performed at three different relative humidities (i.e. 10, 20 and 30%) and three surface temperatures (i.e. 20, 2 and −2°C) to ascertain their effects on droplet spreading and recoil behaviors. In this study, the droplet Weber number, Reynolds number, and the ambient air temperature are fixed at 16.2, 1687, and 23°C, respectively. The high-speed images of impact, spreading and recoil of the droplets as well as the temporal variations of droplet spreads are prepared. Results show that the ratio of surface temperature to dew point temperature (which depends on the air temperature and relative humidity) has a significant influence on droplet spreading, recoil, and contact angle. When this ratio is less than one, condensation and frost formation become important. Decreasing the mentioned ratio (it can be done by decreasing the surface temperature or increasing the relative humidity) causes the droplet spreading factor for hydrophilic surfaces to increase significantly. For superhydrophobic surface, decreasing this ratio (within the mentioned range) does not influence the maximum spreading. However, the recoiling phase is slowed down and the droplet detachment time form the superhydrophobic surface is increased noticeably. In addition, the equilibrium contact angle decreases as the mentioned ratio decreases.
Sponsorship	Fluids Engineering Division
File Format	PDF
ISBN	9780791851555
DOI	10.1115/FEDSM2018-83287
Volume Number	Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics
Conference Proceedings	ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting
Language	English
Publisher Date	2018-07-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Water Temperature Dynamics (mechanics) Aluminum Equilibrium (physics) Imaging Reynolds number Drops Glass Condensation
Content Type	Text
Resource Type	Article

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