Flow CFD Analysis of 2D Transient Melt flow from crucible on to the rotating wheel in Planar Melt Spinning Process

Abstract

Transient Flow numerical analysis in planar flow melt spinning process hasbeen carried out by several investigators considering uniform melt flow velocityexiting the nozzle slit on to the rotating wheel. The present numerical simulations studies the molten metal flow originating from the crucible, flowingthrough the nozzle slit, and making a 900 turn onto the rotating wheel. This renders the melt flow velocity exiting the nozzle slit to be non-uniform and parabolic in nature which is a more realistic representation of the actual flow. Inert gas present above the molten metal (Fe-B-Si)to prevent oxidation and push the melt out was simulated for pressures ranging from 2 to 6 psig. A Volume of Fluid (VOF) model has been developed in ANSYS Fluent to understand the effects of various process parameters influencing puddle length and amorphous strip formation such as:inert gas ejection pressure, nozzle contact angle θnozzle,and melt temperature. Conjugate heat transfer between the melt puddle and rotating wheel is investigatedas the wheel temperature does not remain constantduring an actual PFMS process. This causes the puddle length to increase and also a consequent decrease in the ribbon thickness which is in agreement with experimental data.