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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 6: 2336 - 2347

DOI: https://doi.org/10.1007/s11630-024-2058-1

A Novel Asymmetric Check Microvalve for Suppressing Flow Boiling Instability in Microchannels

  • ZHOU Fan ,
  • ZHAO Yang ,
  • YIN Ershuai ,
  • HU Dinghua ,
  • LI Qiang
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  • MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

网络出版日期: 2024-11-05

基金资助

The authors acknowledge the financial support from the National Natural Science Foundation of China with Grant No. 52276070 and the Fundamental Research Funds for the Central Universities with Grant No. 30922010903.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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A Novel Asymmetric Check Microvalve for Suppressing Flow Boiling Instability in Microchannels

  • ZHOU Fan ,
  • ZHAO Yang ,
  • YIN Ershuai ,
  • HU Dinghua ,
  • LI Qiang
Expand
  • MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Online published: 2024-11-05

Supported by

The authors acknowledge the financial support from the National Natural Science Foundation of China with Grant No. 52276070 and the Fundamental Research Funds for the Central Universities with Grant No. 30922010903.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

微通道中的流动沸腾换热技术因其优异的传热性能受到广泛关注，但流动沸腾不稳定性一直是限制其应用的重大挑战。沸腾不稳定性会导致一系列问题，如流动分布不均匀，温度和压降振荡。本文提出了一种新型的非对称止回微阀结构，该结构在具有极高的反向与正向流阻比。结果表明，止回微阀结构的反向压降是正向压降的2.06倍，同时其正向流动阻力比传统进口节流器低16%。此外，对双出口条件下止回微阀通道中孤立气泡的气泡动力学进行了数值研究。结果表明，气泡在传统矩形通道中对称生长。气泡在带止回微阀的通道中向下游运动的距离是带入口节流器通道的3倍。因此，带止回微阀的通道对气泡回流的抑制效果优于带入口节流器的通道。并且，气泡下游的生长扩展了有效蒸发区域，这有助于提高气泡的生长速度。止回微阀有望成为传统抑制不稳定性结构的替代，为未来大功率设备的散热提供一种新颖高效的解决方案。

关键词： flow boiling instability; topology optimization; microchannel; bubble dynamics

本文引用格式

ZHOU Fan , ZHAO Yang , YIN Ershuai , HU Dinghua , LI Qiang . A Novel Asymmetric Check Microvalve for Suppressing Flow Boiling Instability in Microchannels[J]. 热科学学报, 2024 , 33(6) : 2336 -2347 . DOI: 10.1007/s11630-024-2058-1

Abstract

Flow boiling in microchannels has attracted wide attention due to its excellent heat transfer capability, but flow boiling instability is a huge challenge limiting its application. Instability can lead to a series of problems, such as uneven flow distribution, temperature and pressure drop oscillations. This work proposes a novel asymmetric check microvalve (ACMV) structure, exhibiting high ratio of resistance between the reverse and forward flow. The results show the reverse pressure drop of the ACMV structure is 2.06 times that of the forward pressure drop, and the forward flow resistance of the ACMV structure is 16% smaller than that of the conventional inlet restrictor. In addition, bubble dynamics of an isolated bubble in the generated channel under dual outlet condition was numerically investigated. It is found that the bubble grows symmetrically in the rectangular channel upstream and downstream. The distance of bubble movement downstream in the microchannel with ACMV is three times that of the microchannel with inlet restrictor. The microchannel with ACMV can suppress the backflow of isolated bubble better than microchannel with inlet restrictor. Moreover, the growth of the bubble downstream extends the effective evaporation domain, which contributes to the enhanced bubble growth rate. The ACMV is expected to be a potential replacement for the conventional inlet restrictor, which provides a novel and efficient solution for future heat dissipation from high power devices.

Key words： flow boiling instability; topology optimization; microchannel; bubble dynamics

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