近临界流体微通道内流动稳定性和换热特性研究

陈林; 张信荣

doi:10.3879/j.issn.1000-0887.2014.03.001

近临界流体微通道内流动稳定性和换热特性研究

doi: 10.3879/j.issn.1000-0887.2014.03.001

陈林,
张信荣

北京大学工学院,北京 100871

基金项目: 国家自然科学基金（51276001）

详细信息

作者简介:
陈林（1987—），男，重庆人，博士生(Tel: +86-10-82529066; E-mail: chenlinpku06@pku.edu.cn)

中图分类号: O354
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- 文章访问数: 1067
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- 被引次数: 0
出版历程
- 收稿日期: 2013-09-27
- 修回日期: 2013-12-10
- 刊出日期: 2014-03-15

Flow Stability and Heat Transfer Characteristics of Near-Critical Fluid in Micro-Scale Channels

College of Engineering, Peking University, Beijing 100871, P.R.China

Funds: The National Natural Science Foundation of China（51276001）

摘要

摘要: 微尺度条件下的化工、医药、传热与能源利用等系统的研究已经成为极具潜力和挑战性的课题．相应条件下流体流动和换热的分析必须考虑尺度效应所带来的系列问题．该研究采用了数值模拟方法对近临界二氧化碳流体在微尺度通道内的流动稳定性和换热特性进行了探索．研究发现，在近临界区域内由于流体较强的膨胀特性和较低的热扩散特性，在微尺度几何条件下会产生瞬态不稳定的漩涡流动．该种条件下微尺度对流换热和混合效率都得到了大幅提高．进一步，研究针对微尺度局部稳定性演化进行了机理分析并应用了参数估计，总结获得了微通道内近临界流体瞬态换热和混合的基本特性.
- 近临界流体 /
- 微通道 /
- 二氧化碳 /
- 对流换热 /
- 稳定性
Abstract: Supercritical/near-critical fluid is very dense and highly expandable, and with its preferable flow and heat transfer properties, it has been valued in various kinds of energy conversion systems. The fluid critical transition and divergence are very important for both hydrodynamic study and heat transfer applications. The near-critical cabron dioxinde horizontal flow and its heat transfer performance in micro-scale channels were studied. Detailed numerical procedures were carried out with the Navier-Stokes equations as well as the energy and state equations, which were treated with special care for the sake of micro-scale investigations. In view of the thermal-mechanical effects of critical fluid, abnormal thermal convection structure and transient micro-scale vortex mixing evolution mode were found in micro-scale channels. Basic Kelvin-Helmholtz instability was identified for the near-critical fluid unstable convection. Due to the hot boundary vortex evolution, heat transfer of near-critical micro-scale channel flow was greatly enhanced, leading to fast thermal/heat transfer equilibrium process. The near-critical fluid convection problem is then characterized from a more general viewpoint in this study.
- near-critical fluid /
- micro-scale channel /
- carbon dioxide /
- convection heat transfer /
- stability

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参考文献(27)

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近临界流体微通道内流动稳定性和换热特性研究

doi: 10.3879/j.issn.1000-0887.2014.03.001

作者简介:
陈林（1987—），男，重庆人，博士生(Tel: +86-10-82529066; E-mail: chenlinpku06@pku.edu.cn)

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Flow Stability and Heat Transfer Characteristics of Near-Critical Fluid in Micro-Scale Channels

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近临界流体微通道内流动稳定性和换热特性研究

doi: 10.3879/j.issn.1000-0887.2014.03.001

作者简介: 陈林（1987—），男，重庆人，博士生(Tel: +86-10-82529066; E-mail: chenlinpku06@pku.edu.cn)

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出版历程

Flow Stability and Heat Transfer Characteristics of Near-Critical Fluid in Micro-Scale Channels

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出版历程

目录

作者简介:
陈林（1987—），男，重庆人，博士生(Tel: +86-10-82529066; E-mail: chenlinpku06@pku.edu.cn)