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

CHEN Lin; ZHANG Xin-rong

doi:10.3879/j.issn.1000-0887.2014.03.001

Volume 35 Issue 3

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CHEN Lin, ZHANG Xin-rong. Flow Stability and Heat Transfer Characteristics of Near-Critical Fluid in Micro-Scale Channels[J]. Applied Mathematics and Mechanics, 2014, 35(3): 233-246. doi: 10.3879/j.issn.1000-0887.2014.03.001

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

doi: 10.3879/j.issn.1000-0887.2014.03.001

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

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

Received Date: 2013-09-27
Rev Recd Date: 2013-12-10
Publish Date: 2014-03-15

Abstract

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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References(27)

References

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