• CN：11-2187/TH
• ISSN：0577-6686

• 可再生能源与工程热物理 •

### 水滴型凹穴微通道流动与传热的熵产分析*

1. 北京工业大学环境与能源工程学院 北京 100124
• 出版日期:2017-02-20 发布日期:2017-02-20
• 作者简介:

贾玉婷，女，1988年出生，博士研究生。主要研究方向为微尺度强化传热。

E-mail：jiayuting@emails.bjut.edu.cn

夏国栋(通信作者)，男，1965年出生，博士，教授，博士研究生导师。主要研究方向为微电子设备的冷却及微尺度流动与传热、气液两相 流动。

E-mail：xgd@bjut.edu.cn

• 基金资助:
* 国家自然科学基金(51576005)和河北省自然科学基金-青年基金(E2016502048)资助项目; 20160411收到初稿，20160829收到修改稿;

### Entropy Generation Analysis of Flow and Heat Transfer in Microchannel with Droplet Reentrant Cavities

JIA Yuting, XIA Guodong, MA Dandan, LI Yifan, ZONG Luxiang

1. College of Environmental and Energy Engineering， Beijing University of Technology， Beijing 100124
• Online:2017-02-20 Published:2017-02-20

Abstract:

A numerical investigation is performed to study the flow and heat transfer characteristics in a microchannel with droplet reentrant cavities, which have different angles with equal diameter section. The thermal enhancement factor (η? and augmentation entropy generation number (Ns, a) are used to evaluate the comprehensive performance of the microchannel. The numerical results indicate that the pressure drop of microchannel with droplet reentrant cavities reduced zigzag along the flow direction. Compared with the rectangular microchannel, the droplet reentrant cavities have less effect on the pressure drop. WhenRe is small, the effect of droplet reentrant cavities on heat transfer increases little and even less than rectangular. However, whenRe>300, as the angle between export tangent of reentrant cavity and equal diameter section decreases, the heat transfer performance gradually increases. The analysis of entropy generation show that the irreversible loss caused by heat transfer increases with the Reynolds number, but the irreversible loss caused by flow friction decreases, and heat transfer entropy generation is the major component of the total entropy generation. The irreversible loss of microchannel with droplet reentrant cavities is smaller than the rectangular channel and the smaller of angle with equal diameter section, the less of the irreversible loss.