In this paper, the evaporation kinetics of microliter-sized sessile droplets of gold colloids (∼250 nm in particle diameters) was experimentally studied on micropatterned superhydrophobic surfaces, compared with those of pure water on a planar hydrophobic surface. The structural microtopography of superhydrophobic surfaces was designed to have a constant air fraction (∼0.8) but varying array patterns including pillars, lines, and wells. During evaporation in a room condition, the superhydrophobic surfaces exhibited a stronger pinning effect than a planar surface, especially in the initial evaporation stage, with significant variations by the surface topographies. Compared to a pure water droplet, colloids exhibited further promoted pinning effects, mainly in the later stage of evaporation. While the well-known evaporative mass transport law of sessile droplets (i.e., linear law of “”) was generally applicable to the superhydrophobic surfaces, much smaller evaporation rate constants were measured on the patterned superhydrophobic surfaces than on a planar hydrophobic surface. A colloidal droplet further showed lower evaporation rate constants than a pure water droplet as the concentration of particles in the droplets increased over the evaporation. Such transition was more dramatic on a planar surface than on the micropatterned surfaces. Whereas there was no clear correlation between evaporation mode and the evaporation rate observed on the superhydrophobic surfaces, the prominent decrease of the evaporation rate on the planar hydrophobic surface was accompanied with the onset of a second pinning mode.
Skip Nav Destination
e-mail: Chang-Hwan.Choi@stevens.edu
Article navigation
Research Papers
Effects of Surface Topography and Colloid Particles on the Evaporation Kinetics of Sessile Droplets on Superhydrophobic Surfaces
Wei Xu,
Wei Xu
Department of Mechanical Engineering, Stevens Institute of Technology
, Hoboken, NJ 07030
Search for other works by this author on:
Chang-Hwan Choi
e-mail: Chang-Hwan.Choi@stevens.edu
Chang-Hwan Choi
Department of Mechanical Engineering, Stevens Institute of Technology
, Hoboken, NJ 07030
Search for other works by this author on:
Wei Xu
Department of Mechanical Engineering, Stevens Institute of Technology
, Hoboken, NJ 07030
Chang-Hwan Choi
Department of Mechanical Engineering, Stevens Institute of Technology
, Hoboken, NJ 07030e-mail: Chang-Hwan.Choi@stevens.edu
J. Heat Transfer. May 2012, 134(5): 051022 (7 pages)
Published Online: April 13, 2012
Article history
Received:
September 24, 2010
Revised:
July 21, 2011
Published:
April 11, 2012
Online:
April 13, 2012
Citation
Xu, W., and Choi, C. (April 13, 2012). "Effects of Surface Topography and Colloid Particles on the Evaporation Kinetics of Sessile Droplets on Superhydrophobic Surfaces." ASME. J. Heat Transfer. May 2012; 134(5): 051022. https://doi.org/10.1115/1.4005715
Download citation file:
Get Email Alerts
Cited By
Related Articles
Thin-Film Evaporation in an Evaporating Droplet
J. Heat Transfer (August,2009)
Evaporation Characteristics of Sessile Droplets on Nano-Patterned Hydrophobic Surfaces
J. Heat Transfer (August,2010)
Evaporation and Dryout of Nanofluid Droplets on a Microheater Array
J. Heat Transfer (August,2006)
Experimental Investigation of the Water Droplet Evaporation on Inclined Surfaces by Taguchi and ANOVA Optimization Analysis
J. Thermal Sci. Eng. Appl (January,2024)
Related Chapters
Energy Balance for a Swimming Pool
Electromagnetic Waves and Heat Transfer: Sensitivites to Governing Variables in Everyday Life
Chitosan-Based Drug Delivery Systems
Chitosan and Its Derivatives as Promising Drug Delivery Carriers
Comparative Research on Static Stiffness between Vertical Machining Centers with Two Typical Pillars
International Conference on Information Technology and Management Engineering (ITME 2011)