AN APPROXIMATE SOLUTION OF THE HYDRODYNAMIC PROBLEM ASSOCIATED WITH MOVING LIQUID-LIQUID CONTACT LINES

The same approach used by the authors in the context of advancing and receding contact lines is applied to the case of liquid-liquid contact lines. The result is an ordinary differential equation whose solution provides an approximate description of the shape of a moving meniscus . It is shown that a system with a viscosity ratio of 10(3) or more ma y be regarded as being a purely advancing/receding case. From the comp arison of the present model with experimental results a dependence of the true contact angle on the line speed is inferred.