Study on the classification of nano-size fine particles in ultarasonic flow field

超声流场中纳米级细颗粒的分级研究

• 批准号: 07455434
• 负责人: KANANOKA Chikao
• 金额: $ 0.58万
• 依托单位: KANAZAWA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455434/
• 关键词: Supersonic flow; Laval nozzle; Ultrafine particle; inertial separation; Classification; 慣性分離; 尖い分離特性; 超音速気流; 薄膜製造; バーチャルインパクター; 定在衝撃波

In this research, followings were studied to develope a novel scheme classifying nano-size ultrafine particle in an ultrasonic flow field.1)Numerical analysises of supersonic flow field around an obstracle with openning and its classification characteristics ; The flow field around an obstacle with different shape and size of openning has been calculated for various combinations of Mach number and suction flow rate and gaps between nozzle outlet and obstacle taking account of conservations of mass, momentum and energy, simultaneously. Then their separation efficiency of particles has been obtained. As a result, shape of standing shock wave around an obstacle was found to be similar for small sucktion flow rate and thus it can be expected to obtain similar characteristics for the case of obstacle without openning.2)Separation efficiency of four ultrasonic impactor with same nozzle outlet width of 4mm but different shapes and different gap distances using monodisperse Stannous Bromide particles ranging 20 to 1000nm. Test particles were first generated in polydisperse state by evaporation and condensation method, and then classified to monodisperse particles by a differential electric mobility analyzer. Stability of inlet and outlet particle concentrations have been monitored by a light scattering dust counter purchased by this grant. Coarse and fine fractions of test particles were determined quantitatively by a liquid ion chromalography.3)Experimentally obtained separation efficiency curve increase very steeply and they separate much smaller and sharper cut performance than a conventional impactor. However, separation performance was found to depend strongly on the nozzle shape and gap between nozzle outlet and obstacle. Fanally it was summarized by using modified Stokes number taking account of those effects simultaneously.

在这项研究中，研究了以下研究，以开发一种新的方案，该方案在超声流场中对纳米大小的超细粒子进行了分类。1）对具有开放式及其分类特性的oppastrace围绕围绕的超音速流场进行数值分析；已经计算出具有不同形状和开放尺寸的障碍物的流场，该障碍物是针对马赫数和吸气流量的各种组合，以及相同的质量，动量和能量保护的喷嘴出口和障碍物之间的间隙。然后已经获得了它们的分离效率。结果，发现障碍物周围的站立冲击波的形状对于小的吮吸流量是相似的，因此可以预期它将获得相似的特征，而无需打开障碍物。2）与相同的四个超声撞击器的分离效率喷嘴出口宽度为4mm，但使用单分散的溴化溴颗粒范围为20至1000nm，但不同的形状和不同的间隙距离。首先通过蒸发和冷凝法以多分散状态生成测试颗粒，然后通过差异电动迁移分析仪分类为单分散粒子。该赠款购买的光散射灰尘计数器已经监测了入口和出口颗粒浓度的稳定性。通过液体离子染色体摄影定量确定测试颗粒的粗糙和细小分数。3）实验获得的分离效率曲线的增加非常陡峭，它们的分离比传统的撞击器要小得多，削减性能要小得多。但是，发现分离性能在很大程度上取决于喷嘴形状和喷嘴出口和障碍物之间的差距。狂热的情况下，通过同时使用修改的Stokes编号来概括一下。

项目成果

C. Kanaoka et al: "INERTIAL SEPARATION OF NANO-SIZE PARTICLES FROM SUPERSONIC FLOW FIELD" J. Aerosol Sci.27・7. s623-s624 (1996)

C. Kanaoka 等人：“来自超声流场的纳米尺寸颗粒的惯性分离”J. Aerosol Sci.27・7（1996）。

Chikao Kanaoka and Masami Furuuchi: "Inertial separation of nano-size particles from supersonic flow field" Journal of Aerosol Science. vol.27, No.7. s263-s624 (1996)

Chikao Kanaoka 和 Masami Furuuchi：“超音速流场中纳米颗粒的惯性分离”《气溶胶科学杂志》。

C.Kanaoka et al: "INERTIAL SEPARATION OF NANO-SIZE PARTICLES FROM SUPERSONIC FLOW FIELD" J.Aerosol Sci.27・7. s623-s624 (1996)

C.Kanaoka 等人：“来自超声流场的纳米尺寸颗粒的惯性分离”J.Aerosol Sci.27·7 (1996)。