Developmental study of a new technique to classify submicron particles

亚微米颗粒分级新技术的发展研究

• 批准号: 03555037
• 负责人: NAKABAYASHI Koichi
• 金额: $ 11.07万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555037/
• 关键词: Classification; Submicron Particle; Almost Rigidly Rotating Flow; Stewartson Layr; Ekman Layr; Interior Region; Particle Motion; Partial Classification Efficiency; ステワートソン層; サブミクロン微粒子分級; 分級性能; せん断層

We have studied a new classifier using the almost rigidly rotating through-flow between rigidly totating housing and rotor, and have obtained the following results.1. Theoretical results(1) In the interior region, the axial velocity depends on slopes and curvatures of the housing and rotor walls, while the azimuthal velocity depends only on the slopes.(2) The ratio of the Ekman transport on the housing to that on the rotor is determinated by the ratio of the function of housing's slope to that of the rotor's.2. Experimental results(1) The condition of occurrence of a steady axisymmetric regime of the flow is epsilon(〕SY.ltorsim.〔)1.6E^<0.46>, Where epsilon and E are Rossby and Ekman numbers.(2) Velocity distributions of the interior region agree with the theoretical results.(3) The Stewartson layr constitutes of the inner layr with a strong axial flow and the outer layr with a weak reverse flow.(4) We got excellent classification efficiency (sharpness index * 1.5) for the case where the feed is supplied only within the Ekman layr on the rotor.3. Computational analysis(1) A computational code to simulate the almost rigidly rotating through-flow between the coaxially rotating rotor and housing and a computational code to analyze motion of particles in the flow are constructed.(2) In the analysis of the almost rigidly rotating through-flow between the rotating disk and cylindrical tank, we have numerically considered the mechanism of the present classification technique.(3) Theoretical and experimental results are confirmed by the computational analysis.(4) Almost all particles at the inlet go to Stewartson layr through Ekman layr.(5) Coarse particles go to rigidly rotating region by the effect of centrifugal force at Stewartson layr.(6) Particle classification efficiency are specified by a parameter Dp/^<0Eepsilon>0 (Dp ; diameter of particles, E ; Ekman number, epsilon ; Rossby number).

我们研究了一种利用刚性旋转壳体和转子之间几乎刚性旋转的通流的新型分级机，并得到了以下结果： 1．理论结果(1)在内部区域，轴向速度取决于壳体和转子壁的斜率和曲率，而方位角速度仅取决于斜率。(2)壳体上的埃克曼输运与转子上的埃克曼输运之比由壳体斜率函数与转子斜率函数之比决定。2．实验结果（1）稳定轴对称流态出现的条件为epsilon（〕SY.ltorsim.〔）1.6E^<0.46>，其中epsilon和E分别为Rossby数和Ekman数。（2）内部区域速度分布与理论结果一致。（3）Stewartson层由强轴流内层和 (4) 当进料仅在转子上的埃克曼层内供应的情况下，我们获得了优异的分级效率（锐度指数* 1.5）。 3．计算分析(1) 构建了模拟同轴旋转转子和壳体之间几乎刚性旋转通流的计算代码以及分析流中颗粒运动的计算代码。(2) 在对旋转盘和圆柱形罐之间几乎刚性旋转通流的分析中，我们对现有分类技术的机理进行了数值考虑。(3) 理论和实验结果通过 (4) 入口处的几乎所有颗粒均通过 Ekman 层进入 Stewartson 层。(5) 粗颗粒在 Stewartson 层的离心力作用下进入刚性旋转区域。(6) 颗粒分级效率由参数 Dp/^<0Eepsilon>0 指定（Dp ；颗粒直径，E ；Ekman 数，epsilon ；Rossby 数字）。

项目成果

中林功一: "準剛体回転成層流を用いた微粒子分級に関する数値的研究" 日本機械学会講演論文集. 943-1. 48-50 (1994)

Koichi Nakabayashi：“使用准刚性旋转分层流进行颗粒分类的数值研究”，日本机械工程师学会论文集 943-1（1994 年）。

Youhei Morinishi: "Computational method for almost rigidly rotating flow." Trans.Japan Soc.Mech.Engrs.(in Japanese), Ser B. vol.60 (to appear). 572 (1994)

Youhei Morinishi：“几乎刚性旋转流的计算方法。”

Koichi Nakabayashi: "Numerical study of classification of fine particles on almost rigidly rotating flow" Prepr.of Jpn.Soc.Mech.Eng.(in Japanese). No.943-1. 48-50 (1994)

Koichi Nakabayashi：“几乎刚性旋转流上细颗粒分类的数值研究”Prepr.of Jpn.Soc.Mech.Eng.（日语）。

中林 功一: "回転2球流れの準剛体回転成層流" 日本機械学会講演論文集. 910-62. 355-357 (1991)

Koichi Nakabayashi：“具有两个旋转球体的准刚性旋转分层流”日本机械工程师学会会议记录 910-62 (1991)。

Koichi Nakabayashi: "Almost rigidly rotating flow between two concetric rotating spheres." Prepr.of Jpn.Soc.Mech.Eng.(in Japanese). No.910-62. 355-357 (1991)

Koichi Nakabayashi：“两个同心旋转球体之间几乎是刚性旋转的流动。”