Hydrodynamic Study on the Separation of Inclusion from Liquid Metal

液态金属中夹杂物分离的流体动力学研究

• 批准号: 02650473
• 负责人: KIKUCHI Atsushi
• 金额: $ 1.34万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650473/
• 关键词: Nonmetallic Inclusion; Particle Migration; Lift Force; Inclusion Separation; Clean Steel; Turbulent Coagulation; Dispersion Force; Hamaker Constant; 溶融金属; 介在物; 粒子の泳動; 壁付着; レイノルズ数; 無次元相関式; 凝集速度; 急凝集; 粒子の壁付着; モデル実験; 粒径分布

Separation of nonmetallic inclusion from liquid metal is very important for getting clean materials which is desired in recent years. The purpose of this study is to get fundamental knowledge on the hydrodynamic behavior of inclusion particles in liquid metal. The following two model experiments have been made.1. Lateral migration of hollow glass spheres in vertical pipe flows of waterHollow glass spheres, 55-135mum in diameter, were injected in a vertical pipe flow of water or aqueous glycerol solution, and the collection efficiencies of particles on the wall, eta, was measured at the exit of the pipe. The following results were obtained;(1) In the case of the upward flows, the value of eta increased with increasing the length of the pipe, and it changed with the liquid velocity, the particle diameter, the viscosity of liquid and the pipe diameter. The value of eta decreased rapidly in the region of Re>5000, Where Re is the tube Reynolds number.(2) In the case of the downward flows, p … More articles tended to depart from the pipe wall and dispersed homogeneously at the high Reynolds numbers.(3) The values of eta calculated from various lift force theories by using the trajectory theory did not agree with the observed results.(4) Rubinow and Keller's equation on migration velocity of a rotating sphere in a uniform shear flow was modified by multiplying a correction factor, beta, and then values of eta were calculated. Comparing the calculated and observed values of eta, the values of bata were determined and correlated with the particle Reynolds number and the tube Reynolds number.(5) By using this correlation, values of eta of alumina particles in liquid steel were estimated for various conditions.2. Coagulation rate of fine particles in a stirred vesselThe turbulent coagulation rates of polystyrene-latex particles (PSL, 2.85mum) and alumina particles (1.8, 4.85mum) in aqueous electrolyte solutions were measured in a stirred vessel. The following results were obtained;(1) The coagulation rates of the PSL particles in the rapid coagulation condition were consistent with the calculated values by the previous coagulation theory.(2) The coagulation rates of alumina particles were measured at various pH values and electrolyte concentrations to find a rapid coagulation condition. This condition was found to be at pH=8 and C(NaCl)>0.1mol/1.(3) The coagulation rates of alumina particles (1.8mum) agreed with the calculated values by the previous theory. For larger alumina particles (4.85mum), breakup and sedimentation of agglomerates were observed in the later stage of coagulation. Less

从液态金属中分离出非金属夹杂物是获得洁净材料的一个重要方面，这是近年来人们所期望的。本研究的目的是为了解夹杂物在液态金属中的流体力学行为提供基础知识。进行了以下两个模型试验.空心玻璃球在垂直管水流中的横向迁移将直径为55- 135 μ m的空心玻璃球注入水或甘油水溶液的垂直管流中，并在管出口处测量管壁上颗粒的收集效率η。结果表明：（1）在上升流情况下，η值随管长的增加而增大，并随液体流速、颗粒直径、液体粘度和管径的变化而变化。在Re>5000（Re为管内雷诺数）范围内，η值迅速下降。(2)在向下流动的情况下，p ...更多信息 在高雷诺数下，颗粒倾向于离开管壁并均匀分散。(3)用各种升力理论计算的η值与实测结果不一致。(4)Rubinow和Keller关于均匀剪切流中旋转球体的迁移速度的方程通过乘以校正因子β来修正，然后计算η值。通过比较计算值和实测值，确定了bata值，并与颗粒雷诺数和管雷诺数进行了关联。(5)利用该关联式，估算了不同条件下钢液中氧化铝颗粒的η值.在搅拌容器中测量了聚苯乙烯胶乳颗粒（PSL，2.85 μ m）和氧化铝颗粒（1.8，4.85 μ m）在电解质水溶液中的湍流凝聚速率。结果表明：（1）PSL颗粒在快速凝聚条件下的凝聚速率与前人的凝聚理论计算值基本一致。(2)在不同的pH值和电解质浓度下测定了氧化铝颗粒的凝聚速率，以寻找快速凝聚条件。此条件为pH=8，C（NaCl）>0.1mol/l。(3)氧化铝颗粒（1.8 μ m）的凝聚速率与以前的理论计算值一致。对于较大的氧化铝颗粒（4.85 μ m），破碎和沉淀的团聚体中观察到的后期阶段的凝聚。少

项目成果

中屋 道治: "溶鋼中微小介在物の運動に関するモデル実験" 日本鉄鋼協会講演論文集・材料とプロセス. 3. 1192- (1990)

Michiharu Nakaya：“钢水中微小夹杂物运动的模型实验”日本钢铁研究所论文集，材料与工艺，3. 1192-（1990）。

中屋 道治,谷口 尚司,菊池 淳: "溶鋼中介在物の運動に関するモデル実験" 日本鉄鋼協会講演論文集・材料とプロセス. 3. 1192 (1990)

Michiharu Nakaya、Naoji Taniguchi、Jun Kikuchi：“钢水中夹杂物运动的模型实验”，日本钢铁研究所论文集，材料与工艺，3. 1192 (1990)。

Atushi Kikuchi, Shoji Taniguchi and Naruhito Shoji: "Model Experiment on Coagulation of Fine Particles of Inclusion in Liquid steel." CAMP-ISIJ. 1314. 5-4 (1992)

Atushi Kikuchi、Shoji Taniguchi 和 Naruhito Shoji：“钢水中夹杂物细颗粒凝固的模型实验”。

Shoji Taniguchi and Atsushi Kikuchi: "Model Experiment on the Motion of Fine Particles of Inclusion in Liquid Steel" Tetsu-to-Hagane. 423. 78-3 (1992)

Shoji Taniguchi 和 Atsushi Kikuchi：“钢水中夹杂物细颗粒运动的模型实验”Tetsu-to-Hagane。

菊池 淳: "溶鋼中微小介在物の凝集に関するモデル実験" 日本鉄鋼協会講演論文集・材料とプロセス. 5. 1314- (1992)

Jun Kikuchi：“钢水中微观夹杂物团聚的模型实验”，日本钢铁研究所论文集，材料与工艺，5. 1314-（1992）。