David F.
Chao Nengli
Zhang Wen-Jei
Yang ABSTRACT The drop-refractive shadowgraph method is successfully applied to visualize thermocapillary convection flows in sessile drops. Different flow patterns are observed from the drop-refractive far-field shadowgraphic images of the sessile drops. The analysis based on a wave theory for caustics and caustic diffraction leads a new method to identify the profile near the three-phase-line region and estimate the drop-foot height, which is important for the study of spreading of evaporating liquid drops.
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