每年出版 4 期
ISSN 打印: 2169-2785
ISSN 在线: 2167-857X
Indexed in
A NUMERICAL STUDY OF PARTICLE TRANSPORT IN AN EVAPORATING COLLOIDAL SESSILE DROPLET
摘要
A numerical study is carried out to analyze the effect of internal flow on the transport of diluted particles in a sessile droplet of water. We developed a numerical model that accounts for the flow and heat transfer as well as the transport of colloids in the droplet, heat conduction in the substrate and surrounding air, and vapor diffusion in the gas phase. The finite volume method is adopted to solve the problem and to predict how the colloids are distributed inside the droplet. The results show that the internal flow in the drop affects the distribution of the concentration of the solid particles during the evaporation. The outgoing radial flow tends to transport the particles to the edge of the drop toward the contact line, while the flow induced by thermo-capillarity, with its cellular pattern, tends to carry the particles from the edge toward the core of the droplet.