Study of Turbulent Drag Reduction Mechanisms in Dilute Polymer Solution by Using Micro Opto-imaging Technique

微光学成像技术研究聚合物稀溶液湍流减阻机理

• 批准号: 15360093
• 负责人: NISHINO Koichi
• 金额: $ 5.63万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360093/
• 关键词: Flow Visualization; Turbulence; High Polymer Solution; Drag Reduction; Toms Effect; Micro Visualization; Dark-field Microscopy

Experimental studies have been carried out to clarify turbulent drag reduction mechanisms in dilute chain polymer solution by using a micro visualization technique. It is based on the dark-field microscopy. The system employs a commercially available microscope equipped with a dry objective (x40,NA0.75,WD0.51mm) or an oil immersion objective (x100,NA0.50-1.35,WD0.10mm). Illumination is given by a strobe or a pulsed laser (25mJ output energy) together with fiber light guide. An ICCD camera is used for image acquisition. The present imaging system has successfully been used for visualization of standard latex particles, 800-10nm in diameter ; suspended in a liquid layer formed between a slide glass and a cover glass.Dilute chain polymer solutions are prepared by adding polyethyleneoxide (PEO, Alcox E-160) to purified water at 50-500 ppm at weight. Shear stress is given to the solutions when they are sandwiched by glass plates that are pressed by an appropriate force. This has resulted in … More a successful visualization of individual chain polymer, about 20 μm in length, stretched in the liquid. The 50 ppm solution shows the existence of isolated individual polymer molecule while the 500 ppm solution shows the existence of tangled structures of chain polymers.A millimeter-size rectangular channel formed by two parallel glass plates is constructed to visualize PEO's behaviors in a turbulent flow of 10m/s driven by a static pressure difference. Illumination is given by a pulsed Nd:YAG laser in order to freeze PEO'S behaviors in a magnified view of the microscope. It is shown that the present method permits visualization of latex particles, 150nm in diameter, in the turbulent flow. However, the image quality obtained in the visualization of PEO's behaviors in the turbulent flow is not sufficiently high, suggesting further optimization of the present channel and the dark-field microscope for better micro visualization of molecular behaviors responsible for the turbulent drag reduction mechanisms. Less

利用微观可视化技术对稀链聚合物溶液的湍流减阻机理进行了实验研究。它是基于暗场显微镜的。该系统采用市售显微镜，配备干物镜(X40，NA0.75，WD0.51 mm)或油浸物镜(X100，NA0.50-1.35，WD0.10 mm)。照明由闪光灯或脉冲激光(25mJ输出能量)和光纤光导共同提供。使用ICCD摄像机进行图像采集。本成像系统已成功地用于标准乳胶粒子的可视化，直径800-10 nm，悬浮在载玻片和盖子玻璃之间的液层中。稀链聚合物溶液是通过向纯净水中加入重量为50-500ppm的聚环氧乙烷(PEO，Alcox E-160)来制备的。当解被适当的力压住的玻璃板夹在中间时，就会产生剪切力。这导致了…更成功地显示了单个链状聚合物，长度约20μm，在液体中拉伸。50ppm的溶液显示了孤立的单个聚合物分子的存在，而500ppm的溶液显示了链状聚合物的纠缠结构的存在。构建了一个由两个平行的玻璃板组成的毫米大小的矩形通道，以可视化PEO在静压差驱动的10m/S湍流中的行为。为了在显微镜的放大视野中冻结PEO的行为，用脉冲的Nd：YAG激光进行照明。结果表明，该方法可以在湍流中显示直径为150 nm的胶乳颗粒。然而，在显示PEO在湍流中的行为时获得的图像质量不够高，建议进一步优化当前的通道和暗场显微镜，以更好地微观可视化与湍流减阻机理有关的分子行为。较少

项目成果

Development of hemodynamics simulator for human vessels(in Japanese)

人体血管血流动力学模拟器的开发（日语）

• 发表时间: 2003
• 期刊: Report of Micro Visualization Research Project UTNL-R-0434
• 作者: Haruo ISODA;Koichi NISHINO
• 通讯作者: Koichi NISHINO

生体内血流動態の可視化計測シミュレータの開発

体内血流动力学可视化测量模拟器的开发

• 发表时间: 2003
• 期刊: 可視化情報 Vol.23,Supple No.2
• 作者: 礒田治夫;西野耕一;他5名
• 通讯作者: 他5名

礒田治夫, 西野耕一: "生体内血流動態の可視化計測シミーレータの開発"マイクロフロービジュアリゼーション研究会報告書. UTNL-R-0434. 29-53 (2003)

Haruo Isota、Koichi Nishino：“体内血流动力学可视化和测量模拟器的开发”微流可视化研究组报告。 UTNL-R-0434 (2003)。

An in vitro simulator for measuring and visualizing hemodynamics in human vessels(in Japanese)

用于测量和可视化人体血管血流动力学的体外模拟器（日语）

• 发表时间: 2003
• 期刊: Journal of the Visualization Society of Japan Vol.23, Suppl.No.2
• 作者: Haruo ISODA;Koichi NISHINO;Takashi KOSUGI;Shinichiro TAKEDA;Shoichi INAGAWA;Satoshi ISOGAI;Harumi SAKAHARA
• 通讯作者: Harumi SAKAHARA

Micro flow measurements(in Japanese)

微流量测量（日语）

• 发表时间: 2004
• 期刊: Lecture note for Experimental Fluid Dynamics-Basics and Applications of Micro Flow Experimentation, JSME FED No.04-143
• 作者: Eiji Shamoto;et al.;Koichi NISHINO
• 通讯作者: Koichi NISHINO