Investigation of characteristics of two-phase flows through singularities in microchannels

通过微通道奇点的两相流特性研究

• 批准号: 23560199
• 负责人: KAWAHARA Akimaro
• 金额: $ 3.24万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23560199/
• 关键词: 混相流; マイクロチャンネル; 気液二相流; 曲がり流路; 急縮小; 急拡大; 曲り; 圧力変化; 曲がり; 圧力損失; 気泡長さ

Singularities, such as bend, contraction and/or expansion, are commonly used in a two-phase micro-reactor and micro-heat exchanger systems. It is thus essential to understand the effects of the singularities on two-phase flow characteristics in microchannel for developing and designing such micro-systems. The purpose of this study is to investigate the effects of singularities and/or liquid properties on two-phase flow characteristics such as flow regime, void fraction and pressure drop in horizontal rectangular microchannels. Distilled water, pure ethanol and Hydrofluoroether 7200 were used as the test liquids, while nitrogen gas as the test gas. 180 degree return bend, sudden contraction and sudden expansion were tested as the singularities, and the two rectangular microchannels for each singularity with different curvature ration and flow area contraction or expansion ratios were used. Finally, a new correlation was developed to predict the pressure drop due to each singularity.

弯曲、收缩和/或膨胀等奇点通常用于两相微反应器和微热交换器系统。因此，了解奇异点对微通道内两相流特性的影响对于开发和设计微通道系统至关重要。本研究的目的是研究奇点和/或液体性质对水平矩形微通道中两相流特性的影响，如流态、空隙率和压降。实验液体为蒸馏水、纯乙醇和氢氟醚7200，实验气体为氮气。以180度回弯、突然收缩和突然膨胀为奇点进行试验，每个奇点分别使用不同曲率比和流面积收缩或膨胀比的两个矩形微通道。最后，建立了一个新的关系式来预测各奇异点引起的压降。

项目成果

マイクロ流路内の曲がり部における単相流および二相流の圧力降下

微通道弯曲处单相流和两相流的压降

• 发表时间: 2013
• 期刊: 混相流
• 作者: 川原顕磨呂,佐田富道雄,下川聡;Haslinda Kusumaningsih
• 通讯作者: Haslinda Kusumaningsih

矩形マイクロ流路内の急縮小部を通過する単相流および二相流の圧力損失

矩形微通道内单相流和两相流通过骤缩段的压力损失

• 发表时间: 2013
• 作者: 川原顕磨呂,佐田富道雄,栗原大器;Haslinda Kusumaningsih
• 通讯作者: Haslinda Kusumaningsih

Single-phase and two-phase pressure drops through sudden expansion in rectangular microchanne

矩形微通道中突然膨胀导致单相和两相压降

• 发表时间: 2013
• 作者: W. Z. Law;H. Kurihara;Haslinda Kusumaningish;Akimaro Kawahara and Michio Sadatomi
• 通讯作者: Akimaro Kawahara and Michio Sadatomi

Characteristics of Single-Phase and Two-Phase Flows Across Sudden Expansion in Rectangular Microchannels

矩形微通道内突然膨胀的单相流和两相流特性

• 发表时间: 2014
• 作者: A. Kawahara;M. Sadatomi;H. Kurihara;W. Z. Law;M. H. Mansour
• 通讯作者: M. H. Mansour

Bubble and Liquid Slug Length for Two-Phase Flow in a Rectangular Microchannel with T-junction Type Gas-Liquid Mixer

带 T 形接头型气液混合器的矩形微通道中两相流的气泡和液塞长度

• 发表时间: 2011
• 作者: A. Kawahara;M. Sadatomi;S. Shimokawa
• 通讯作者: S. Shimokawa