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Atomization is one of powder production techniques because of high production rates and ability to make alloy powders of desired composition. In gas atomization process, liquid metal is broken into droplets to form powders upon solidification. Gas-metal interaction influences the break-up of liquid stream into droplets. The idea is to transfer kinetic energy from a high velocity jet-gas expanded through a nozzle, to a stream of liquid metal, resulting in fragmentation and break up into metal droplets. Gas atomization process is one of the widely used powder production technique and nozzles play an important role in the gas atomization process. The geometry of nozzles governs the gas to metal interaction. The selection of nozzle type and the flow geometry is the most important preset parameter for atomization process. The design of an atomizing nozzle determines degree of contact of liquid metal with the atomizing gas. Presence of Metal Delivery Tube (MDT) coaxially throughout the flow passage i,e full length of the nozzle will affect flow characteristics of the fluid along radial and axial direction. This helps to analyze flow behavior of gas when MDT is present in the nozzle during gas atomization process. In the present analysis, an attempt was made to analyze effect velocity/Mach number and temperature of the fluid and melt when MDT is present inside the nozzle during the atomization process using the CFD software Fluent.

international journal for research in applied science and engineering technology

Study of Effect of Metal Delivery Tube on Flow characteristics of Fluids and Melt in Convergent- Divergent nozzle used for Gas Atomization Process using CFD techniques