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金属液流的气固两相流雾化破碎准则(英文)
引用本文:陈刚,杨现,苏斌,涂川俊.金属液流的气固两相流雾化破碎准则(英文)[J].中国有色金属学会会刊,2014,24(1):208-216.
作者姓名:陈刚  杨现  苏斌  涂川俊
作者单位:湖南大学 材料科学与工程学院,长沙410082
摘    要:介绍了一种自行发明的新的雾化方法。该方法是采用含有固体介质的高速气流即气固两相流对液体金属或合金进行雾化而制备粉末的一种方法,对比研究了同等条件下普通气体雾化与两相流雾化制备粉末的特征,研究了固体雾化过程中主要工艺参数对固体雾化粉末特征的影响规律。结果表明,两相流雾化制得粉末的平均粒度约为普通气体雾化所得粉末的二分之一,而且粒度分布更集中,粉末的冷却速度比普通气体雾化高一个数量级,粉末微观组织更细小;采用液体雾化破碎准则韦伯数以衡量雾化介质的破碎能力,得出两相流雾化介质的韦伯数为气体韦伯数和颗粒流韦伯数之和,建立了两相流雾化破碎的临界方程,并以此讨论了主要工艺规律。

关 键 词:雾化  金属粉末  气固两相流  韦伯数
收稿时间:4 July 2013

Criterion of gas and solid dual-phase flow atomization crash in molten metal
Gang CHEN,Xian YANG,Bin SU,Chuan-jun TU.Criterion of gas and solid dual-phase flow atomization crash in molten metal[J].Transactions of Nonferrous Metals Society of China,2014,24(1):208-216.
Authors:Gang CHEN  Xian YANG  Bin SU  Chuan-jun TU
Affiliation:(College of Materials Science and Engineering, Hunan University, Changsha 410082, China)
Abstract:A self-invented atomization process, in which molten metal is atomized into powder by a high-velocity gas stream carrying solid particles as the atomization medium, was introduced. The characteristics of powders prepared by common gas atomization and dual-phase flow atomization under similar conditions were compared. The experimental results show that the dual-phase flow-atomized powders have average particle sizes that are one-half that of the common gas-atomized particles;additionally, they possess a finer microstructure and higher cooling rate under the same atomization gas pressure and the same gas flow. The Weber number in the crash criteria of liquid atomization is adopted to measure the crash ability of the atomization media. The Weber number of the dual-phase flow atomization medium is the sum of that of the gas and the solid particles. Furthermore, the critical equation of the crash model in dual-phase flow atomization is established, and the main regularities associated with this process were analyzed.
Keywords:atomization  metal powder  gas and solid dual-phase flow  Weber number
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