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A New Insight to Interfacial Phenomena Occurring at Slag‐Metal Interfaces
Author(s) -
Muhmood Luckman
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100140
Subject(s) - surface tension , materials science , viscosity , slag (welding) , metal , shear (geology) , thermodynamics , modulus , shear modulus , composite material , metallurgy , physics
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 (5–10 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 10–100 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.