Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2016 - November 13, 2016
In order to investigate complex behaviors of suspended particles in liquid, we have constructed a confocal microscope system that enables us to measure the spatio-temporal distribution of micro particles. Three-dimensional visualizations of densely-suspended particles have been performed for an evaporating droplet on a glass substrate. In a droplet of water 99.9% and particle 0.1%, it is found that the particles mostly move along the substrate surface and assemble at the contact line. For a droplet of 33.3% aqueous ethanol solution, particles migrate along not only the substrate surface, but also the air-liquid interface. This implies that the flow inside a water droplet is induced by evaporation, while the flow inside a droplet of aqueous ethanol solution is strongly influence by the Marangoni effect.
