DYNAMIC BEHAVIOR OF A LIQUID LIQUID INTERFACE AT AN OSCILLATING WALL/

The dynamic behavior of the meniscus between two liquids has been inve stigated experimentally using mercury and silicon oil and theoreticall y by solution of the equations of motion applying the marker and cell (MAC) method. The liquids were contained in a plexiglass tube which co uld be moved relative to the liquids with constant and superposed sinu soidal velocities. Special attention was focused on the movement of th e three-phase contact line (TPL) at the wall. Depending on the paramet ers of the motion, the TPL may be drawn above the flat part of the oil /mercury meniscus so that the normally convex contour of the meniscus disappears and a concave contour is formed. Good agreement was found b etween the measured and computed shapes of the meniscus.