Abstract
ANSYS Fluent 19.0 software is used to numerically simulate atomization process in the production of nickel-based alloy powders by VIGA. The gas flow field in the atomizing chamber and atomization process of the metal melt is studied. Atomizing air flow is sprayed through the nozzle to form supersonic gas flow. The results show that the recirculation zone is inverted cone, and the length of recirculation zone is 12.28 mm. Under the stagnation point, the velocity direction of the air flow is downward, and the velocity increases gradually (the maximum is 457.43 m/s). In gas-liquid two-phase state, the length of recirculation zone is about 16 mm. The higher the turbulence in the recirculation zone and turbulent layer, the more intense the interaction between primary and secondary atomization.
Highlights
Gas atomization is a preparation method which uses high kinetic energy gas to impact the high-temperature melt of metal or alloy into small droplets, and rapidly solidify into solid powder [1, 2]
Vacuum induction melting gas atomization (VIGA) is a widely used method to prepare metal powder. It is divided into two main stages [3]: the primary atomization, known as one-time crushing, refers to the cylindrical flow of high-temperature molten alloy flowing out of the delivery tube, which interacts with the high-speed gas flow field, disperses and forms a liquid film, and breaks into an initial droplet; the second atomization, known as the second crushing, refers to the process that the initial droplet is entrained by the air flow to the turbulent layer
The breaking process of molten metal is a coupling process of multiphase flow, including primary atomization and secondary atomization, which is difficult to be characterized by conventional experimental means [4, 5]
Summary
Gas atomization is a preparation method which uses high kinetic energy gas (atomizing medium) to impact the high-temperature melt of metal or alloy into small droplets, and rapidly solidify into solid powder [1, 2]. Vacuum induction melting gas atomization (VIGA) is a widely used method to prepare metal powder It is divided into two main stages [3]: the primary atomization, known as one-time crushing, refers to the cylindrical flow of high-temperature molten alloy flowing out of the delivery tube, which interacts with the high-speed gas flow field, disperses and forms a liquid film, and breaks into an initial droplet; the second atomization, known as the second crushing, refers to the process that the initial droplet is entrained by the air flow to the turbulent layer. Especially in solving complex flow problems, numerical simulation method has obvious advantages and is paid more and more attention
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