Motion of a triple junction

The motion of a triple junction is investigated. We consider only the two-d imensional case and assume that initially the fluid is in the form of three inviscid wedges. A similarity solution is determined which accounts for a balance of force at the triple junction. This similarity solution is comput ed numerically using boundary integral methods. Results are presented for d ifferent initial wedge angles and surface tension ratios. In particular the location of the triple junction and the resulting capillary waves along th e interfaces are discussed.