A computational fluid dynamics(CFD)approach was developed to simulate the EIGA(electrode induction melting gas atomization)with different protrusion lengths of delivery tube.The effect of the protrusion length of delivery tube on the flow field structure and powder particle size was analyzed.The results show that when the protrusion length is 0 mm,the maximum velocity in the recirculation zone is 335 m/s,and the expansion wave cluster at the gas outlet increased significantly,resulting in backflow phenomenon.With the increase of the protrusion length(1～4 mm),the length of the recirculation zone gradually increases,and the average particle size of the alloy powder prepared first decreases and then increases.The maximum suction pressure is achieved at 2 and 3 mm of protrusion length of delivery tube,which is beneficial to the secondary fragmentation of liquid droplets.When the protrusion length is 2 mm,the particle size distribution of the powders shows a normal distribution,and the median diameter(d50)of the powders is 84 μm,which is the most uniform particle size distribution and the narrowest particle size range.
electrode induction melting gas atomization(EIGA)delivery tubeflow field structurerecirculation zoneparticle size distribution
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