Abstract
Behavior of fluid interface on solid surface ("contact line") has large effect on boiling or coating or wave on the surface of confined liquid. However, detailed flow field is still unclear. The object of this study is to clarify the element primarily contributing to the flow field. In this study, the flow field near the contact line with several combinations of fluids which have different interface tension or ratio of viscosity was measured by Particle Imaging Velocimetry (PIV) during removal of a solid surface (glass or acryl or stainless steel) from the lower fluid (water or PDMS) to the upper fluid (air or PDMS), and then compared with the hydrodynamic model proposed by Huh and Scriven (1971) (hereafter referred as "Huh's model"). From the comparison, it is known that Huh's model did not necessarily reproduce our experimental flow field. It is shown that slight gradient of the interface tension should considerably affect on the flow field through the Marangoni effect.
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