A New Insight to Interfacial Phenomena Occurring at Slag-Metal Interfaces

QC 20120227
Interfacial dilatational modulus was evaluated for slag-metal systems using oxygen and sulfur as tracers at 1823?K. The high values of the dilatational modulus (510 times that obtained for surfactant adsorption) was directly related to the higher change in apparent interfacial tension prevailing at the slag-metal interface. The variation in the dilatational modulus was attributed to the non-uniform distribution of surface active elements at the interface and also due to the varying surface pressure. Further, experiments were designed to estimate the surface shear viscosity. A relationship was established to find the surface/interfacial shear viscosity from the Newton's law of viscosity. The order of magnitude of the interfacial shear viscosity at the slag-metal interface was estimated from the values obtained earlier for the interfacial velocity. The order of magnitude obtained for slag-metal systems was roughly 10100 times that usually occurring in colloidal systems. The same could be attributed to the high bulk viscosities of the individual phases in slag-metal systems. The order of magnitude of the interfacial velocity was verified from the equation generated earlier by dimension analysis to be similar to those obtained from experiments.

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

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