Effect of suspended particles on the drying process of a carrier-fluid droplet sitting on a solid surface.
We focus on an evaporation process of a volatile droplet on a temperature-controlled solid substrate. The process is strongly affected by suspending tiny particles inside the droplet, resulting in a well-known phenomenon called the "coffee stain problem." The target systems in this study are (1) the water-hydrophilic particle and (2) the water-ethanol mixture-hydrophilic particle. Spatio-temporal particle motion in the induced flow in the evaporation process is visualized by applying three-dimensional particle tracking velocimetry. The correlation between the particle behavior in the evaporation process and the morphological pattern of the droplet after dryout is also discussed.
Division of Mechanical Engineering, Graduate School of Science and Technology, Tokyo University of Science, Chiba, Japan.
Kazunori
K
Kochiya
Ichiro
I
Ueno
D003890:Desiccation / Q000379:methods*; D010316:Particle Size; D044367:Phase Transition; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
D014867:Water