Abstract
Two-dimensional, simultaneous measurement of the liquid interface profile is highly desired for understanding the time evolution of the interface behavior near the moving contact line. In this study, we examine the applicability of Color Coding Method, originally developed for the measurement of interface wave, to the measurement of the shape of interface near the contact line. The gradient profile of a sessile drop reconstructed with the proposed method shows good agreement with that obtained from the backlighted photograph with the deviation in the contact angle less than 6 degrees. The dynamic contact angle distribution on the finger developed on an advancing front of a liquid film flowing down an inclined solid surface is investigated and found to take a maximum around the tip of the finger.
