A12-084 SOLUTE DEPOSIT DURING EVAPORATION OF BINARY LIQUID MICRO-DROPLET ON A SUBSTRATE

概要

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Formation of a ring-like deposit of solute during the evaporation of a binary liquid sessile droplet on a substrate is studied both experimentally and numerically. The effects of droplet spread radius and substrate surface temperature on ring-like deposit of solute are investigated. The width of ring increases with decreasing in the spread radius and the substrate temperature. The evaporation rate distributions on the droplet surface are numerically obtained to predict the shape of thin film of solute after the evaporation using the theoretical model for solute transfer in a sessile droplet. When the substrate temperature is low, the increase in the evaporation rate near the contact line is inhibited. As a result, the velocity in the droplet toward the contact line, which causes the solute transfer, is small and then the width of ring increases.
社団法人日本機械学会の論文
2003-11-30