Numerous studies have explored refractory corrosion in the presence of slag and/or metal, utilising
the Finger Rotating Test (FRT). Recent experimental results revealed that corrosion initially
increased with rising rotation velocity but was then suppressed above a critical rotating speed, under
conditions involving a two-liquid solution of slag and molten steel. This phenomenon indicated that
the liquid/liquid interface movement occurred during spindle rotor. However, understanding of the
phenomenon, known as the rod climbing effect, remains inadequate in the case involving slag,
molten steel and refractories. To gain deeper insights, a simulation experiment was conducted on
the phenomenon using silicon oil/water and the phenomenon was analysed using computerised
simulation software (Ansys Fluent). Experimental modelling demonstrated that interfacial movement
occurs even at low rotation velocity, as low as 200 rev/min, when the viscosity of silicone oil is at
100 cP. Computational analysis utilising the Volume of Fluid (VOF) method and a realisable k-ε
turbulence model elucidated that interface elevation during rotor rotation arises due to viscosity
disparities between the two fluids. Furthermore, this movement is more pronounced when the
viscosity difference is lower. Additionally, the study findings suggest that higher density differences
between two liquids suppress the phenomenon of interface movement.