Computer Aided Interfacial Measurements.

The sessile drop p~ofiie method was combined with X-ray radiography to develop a precise method to measure interfacial tensions and contact angles of liquid metals at high temperatures and in a variety of atmospheres.An accu~ate method of digital image processing was developed to capture, enhance and determine the coordinates of the X-ray shadowimage of the droplet.Laplace's equation was then solved numerically to allow a non-subjective determination of interfacial tension and contact angles, Examplesof the determination of the interfaciai tension of mercury in argon, of liquid iron at 1 550'C under various COIC02gas mixtures. of iron carbon alloys and of liquid iron in contact with a lime alumina-silica slag at 1 550'C, are given.