Numerical simulation of effect of various parameters on atomization in an annular slit atomizer
Yi Wang1,2, Yi-chen Dang1,2, Xiao-qing Chen1,2, Bao Wang1,2, Zhong-qiu Liu3, Jian-an Zhou1,2, Chang-yong Chen1,2
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Numerical simulation of effect of various parameters on atomization in an annular slit atomizer
Yi Wang1,2, Yi-chen Dang1,2, Xiao-qing Chen1,2, Bao Wang1,2, Zhong-qiu Liu3, Jian-an Zhou1,2, Chang-yong Chen1,2
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
摘要 As the width–thickness ratio of the discrete nozzle atomizer’s discrete hole greatly influences the loss of atomizing gas flow rate, the discrete nozzle atomizer was transformed into an annular slit atomizer with the same total nozzle outlet area. A numerical simulation study on the effect of various parameters on the atomization in the annular slit atomizer was carried out by coupling both the large eddy simulation (LES) and volume of fluid (VOF) model, which is based on the applicability of LES in capturing the breakup behavior of transient liquid droplets and the advantage of VOF method in directly capturing the phase interface. The simulation results showed that the increase in the atomization pressure makes the gas gain higher momentum, while the increase in the nozzle intersection angle decreases the distance between the nozzle exit and the computational domain axis. The increase in these two variables results in enhancing the gas–liquid interaction in the primary atomization zone and the formation of more aluminum droplets simultaneously. It is considered that the atomization effect becomes better when atomization pressure is 2.5 MPa, and the nozzle intersection angle is 60°. Industrial tests showed that the aluminum powder prepared by the optimized annular slit atomizer has a finer mean particle size and a higher yield of fine powder. The numerical simulation results agree well with the industrial test data of the powder particle size.
Abstract：As the width–thickness ratio of the discrete nozzle atomizer’s discrete hole greatly influences the loss of atomizing gas flow rate, the discrete nozzle atomizer was transformed into an annular slit atomizer with the same total nozzle outlet area. A numerical simulation study on the effect of various parameters on the atomization in the annular slit atomizer was carried out by coupling both the large eddy simulation (LES) and volume of fluid (VOF) model, which is based on the applicability of LES in capturing the breakup behavior of transient liquid droplets and the advantage of VOF method in directly capturing the phase interface. The simulation results showed that the increase in the atomization pressure makes the gas gain higher momentum, while the increase in the nozzle intersection angle decreases the distance between the nozzle exit and the computational domain axis. The increase in these two variables results in enhancing the gas–liquid interaction in the primary atomization zone and the formation of more aluminum droplets simultaneously. It is considered that the atomization effect becomes better when atomization pressure is 2.5 MPa, and the nozzle intersection angle is 60°. Industrial tests showed that the aluminum powder prepared by the optimized annular slit atomizer has a finer mean particle size and a higher yield of fine powder. The numerical simulation results agree well with the industrial test data of the powder particle size.
Yi Wang,Yi-chen Dang,Xiao-qing Chen, et al. Numerical simulation of effect of various parameters on atomization in an annular slit atomizer[J]. Journal of Iron and Steel Research International, 2023, 30(6): 1128-1141.
2023, Vol. 30 
