Numerical Investigation on the Gas Field Generated by High Pressure Gas Atomizer Focused on Physical Mechanisms of Gas Recirculation and Wake Closure Phenomenon

• Autorzy: Liu Mingxiang , Zhou Shan

Identyfikatory

DOI

10.24425/amm.2022.137485

• Języki publikacji: EN

Abstrakty

EN

Physical mechanisms of gas recirculation and wake closure were investigated by modeling the gas field generated by High Pressure Gas Atomizer using computational fluid dynamics. A recirculation mechanism based on axial and radial gas pressure gradient was proposed to explain the gas recirculation. The occurrence of wake closure is regarded as a natural result when elongated wake is gradually squeezed by expansion waves of increasing intensity. An abrupt drop could be observed in the numerical aspiration pressure curve, which corresponds well with the experimental results. The axial gradient of gas density is considered as the reason that results in the sudden decrease in aspiration pressure when wake closure occurs. Lastly, it is found that a shorter protrusion length and a smaller melt tip diameter would lead to a smaller wake closure pressure, which could benefit the atomizer design to produce fine metal powder with less gas consumption.

Słowa kluczowe

EN

gas field; aspiration pressure; recirculation mechanism; wake closure; atomization

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2022
• Tom: Vol. 67, iss. 1
• Strony: 167--174
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., wzory

Twórcy

autor

Liu Mingxiang

• Shanghai University, School of Materials Science and Engineering, Center for Advanced Solidification Technology, Shanghai 200444, China

• https://orcid.org/0000-0003-0655-543X

autor

Zhou Shan

• Shanghai Jiao Tong University, Institute of Forming Technology and Equipment, 1954 Huashan Road, Shanghai 200030, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).