Formation and Transportation of Disperesed Phases in Microchannels and Development of Microseparators for Heterogeneous Systems.

微通道中分散相的形成和传输以及异质系统微分离器的开发。

• 批准号: 15360415
• 负责人: MOROOKA Shigeharu
• 金额: $ 6.85万
• 依托单位: Fukuoka 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-15360415/
• 关键词: Microchannel; Multiphase Flow; Mass Transfer; Chemical Reaction; Simulation

Separation processes possess major parts in all chemical plants, and, therefore, effective miniaturization of separation units actually decides the success of micro-chemical plants. Multi-phase flows are especially important because they are utilized in principal separation units, such as distillation, gas absorption, extraction and particle separation. In the present study, microchannels with a variety of configurations are fabricated, and multi-phase flows for gas-liquid and liquid-liquid systems are investigated by experiments and computational fluid dynamics.The effects of vibration on gas-liquid microchannel flow were investigated in detail. The vibration along the flow direction accelerated coalescence of fine bubbles, while the vibration perpendicular to the flow direction caused self-exited vibration. These findings are important to control the behavior of fine bubbles in microchannels.Measuring techniques of gas-liquid flow in microchannels were developed, and pressure drop an … More d relative velocity of fine bubbles were fully determined.Flow patterns in horizontal microchannels for liquid-liquid systems were determined as functions of physical properties of liquid, inlet shapes, and liquid flow rates. The criteria for homogeneous droplet flow, heterogeneous droplet flow and layered two phase flow were respectively evaluated.Two-phase flows in microchannels were simulated by using computational fluid dynamics software (FLUENT). The results were in good agreement with the experimental data. The affinity between the wall surface and the flowing fluid was found to play a key role for the formation of homogeneous fine droplets.The liquid-liquid flow systems were also studied with respect to extraction, and the conditions for stable liquid-liquid separation at the exit were obtained. The extraction of Cu ions was then carried out, and it was found that the design of the microchannel strongly influenced the extraction efficiency. The backmix properties of microchannel flow were also investigated.The above results evidently contribute the creation of noble separation units for multi-phase systems in the scale of microchannels. Less

分离过程在所有化工装置中占有重要地位，因此，分离单元的有效小型化实际上决定了微型化工装置的成功。多相流是特别重要的，因为它们用于主要的分离单元，如蒸馏、气体吸收、萃取和颗粒分离。本论文制备了多种结构的微通道，通过实验和计算流体力学的方法研究了气-液和液-液体系的多相流动，详细研究了振动对微通道内气-液流动的影响。沿着流动方向的振动加速了气泡的聚并，而垂直于流动方向的振动则产生自激振动。发展了微通道内气液两相流动的测量技术，并对微通道内气液两相流动的压力降和压力分布进行了研究， ...更多信息 详细测定了液-液体系水平微通道内微小气泡的相对速度，并确定了液体物性、入口形状和液体流量对液-液体系水平微通道内流型的影响。分别评价了均匀液滴流动、非均匀液滴流动和分层两相流动的准则，并利用计算流体力学软件（FLUENT）对微通道内的两相流动进行了模拟。计算结果与实验数据吻合较好。发现壁面与流动流体之间的亲和力对均匀细小液滴的形成起着关键作用，还研究了液-液流动系统对萃取的影响，得到了出口处稳定液-液分离的条件。然后进行Cu离子的萃取，并且发现微通道的设计强烈地影响萃取效率。研究了微通道内流体的返混特性，为在微通道尺度上建立多相分离单元提供了理论依据。少

项目成果

Three Dimensional Simulation and Visualization of Laminar Flow in a Microchannel with Hair-Pin Curves

发夹曲线微通道层流的三维模拟与可视化

• 发表时间: 2004
• 期刊: AIChE Journal 50・7
• 作者: Y.Yamaguchi;F.Takagi;K.Yamashita;H.Nakamura;H.Maeda;K.-I.Sotowa;K.Kusakabe;Y.Yamasaki;S.Morooka
• 通讯作者: S.Morooka

Phase Separation of Air Water Two-Phase Mixture Flowing in a Micro Channel

微通道内流动的气水两相混合物的相分离

• 发表时间: 2005
• 期刊: 6^<th> KSME-JSME Thermal and Fluids Eng.Conf.
• 作者: Y.Yamasaki;A.Kariyasaki;A.Ousaka;S.Morooka
• 通讯作者: S.Morooka

Simulation of Laminar Flow Behavior in a Microchannel and Its Three-dimensional Visualization

微通道层流行为模拟及其三维可视化

• 发表时间: 2004
• 期刊: Kagaku Kogaku Ronbunshu 30・3
• 作者: Y.Yamaguchi;F.Takagi;K.Yamashita;H.Shimizu;H.Maeda;K.-I.Sotowa;K.Kusakabe;Y.Yamasaki;S.Morooka
• 通讯作者: S.Morooka

Behavior of a pair of bubbles generated successively from single nozzle

从单个喷嘴连续产生一对气泡的行为

• 发表时间: 2004
• 期刊: 5^<th> International Conf.on Multiphase Flow
• 作者: T.Sanada;M.Watanabe;T.Fukano;A.Kariyasaki
• 通讯作者: A.Kariyasaki

山口佳子, 高木史典, 山下健一, 清水肇, 前田英明, 外輪健一郎, 草壁克己, 山崎吉一, 諸岡成治: "屈曲構造を持つマイクロ流路における流体挙動とそのシミュレーション"化学工学論文集. (印刷中).

Yoshiko Yamaguchi、Fuminori Takagi、Kenichi Yamashita、Hajime Shimizu、Hideaki Maeda、Kenichiro Somawa、Katsumi Kusakabe、Yoshikazu Yamazaki、Seiji Morooka：“具有弯曲结构的微通道中的流体行为及其模拟”（正在印刷中）。