Study on the Atomization Ability of the Annular Slit Nozzle Assembly with the Delivery Tube of Lower-limiting Flow

doi:10.3901/JME.2023.06.103

Abstract

Abstract: High-quality metal powders are the basic material in many manufacturing fields, the key technology of microfine powder forming is in the stage of gas atomization, and the structural parameters of nozzle and delivery tube and the atomization parameters have a great impact on the quality of the powders from gas atomization. The effects of atomization pressure, gas temperature, lower port diameter and protrusion length on the atomization ability of annular slit nozzle assembled with delivery tube of lower-limiting flow are analyzed by numerical simulation based on high-speed jet flow fluid dynamics. The accuracy of the model is validated by the measurement device for fluid flow filed of the spray disc. The results show that the critical inlet pressure of the annular slit nozzle assembled with delivery tube of lower-limiting flow is 128.1 kPa and the atomization pressure is 2.0 MPa, which can not only effectively increase the maximum velocity of the gas in the atomization chamber and reduce the minimum temperature, but also prevent the backflow caused by too high pressure from affecting the atomization stability. In addition, at the ultimate atomization pressure of 2.0 MPa, the gas to metal ratio (GMR) can be increasing the atomization gas temperature, reducing the lower port diameter from 5 mm to 1 mm and increasing the protrusion length from 0 mm to 2 mm for the improvement of atomization ability. The production practice also confirmed the foresight of the model, the production is antegrade and the powder particle size D₅₀ is only 23.84 μm under this optimized process.

Key words: delivery tube of lower-limiting flow, atomization pressure, atomization gas temperature, lower port diameter, protrusion length, atomization ability

CLC Number:

TF123

DONG Yannan, WANG Pu, LIU Jiaqi, YANG Dong, PANG Jing, LI Xiaoyu, ZHANG Jiaquan. Study on the Atomization Ability of the Annular Slit Nozzle Assembly with the Delivery Tube of Lower-limiting Flow[J]. Journal of Mechanical Engineering, 2023, 59(6): 103-113.

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