化工进展 ›› 2020, Vol. 39 ›› Issue (11): 4330-4341.DOI: 10.16085/j.issn.1000-6613.2020-0090

• 化工过程与装备 • 上一篇    下一篇

微柱群流动及换热研究进展

王乐(), 翁建华()   

  1. 上海电力大学能源与机械工程学院,上海 200090
  • 出版日期:2020-11-05 发布日期:2020-11-06
  • 通讯作者: 翁建华
  • 作者简介:王乐(1994—),男,硕士研究生,研究方向为传热与流体流动。E-mail:WLL1681@163.com

Research progress of flow and heat transfer in micro-pin-fins

Le WANG(), Jianhua WENG()   

  1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
  • Online:2020-11-05 Published:2020-11-06
  • Contact: Jianhua WENG

摘要:

微柱群结构能够增大有效传热面积并增强流动扰动,在航空航天、核电站、空调制冷等领域有广阔的应用前景。但是宏观流动传热机理在微尺度下不一定适用,在微尺度领域流动换热受更多因素影响。本文针对结构、纳米粒子以及不同重力水平对微柱群流动换热影响机理进行了综述,总结了国内外在这方面的研究成果。流线型微柱群结构具有较好的传热性能。文中指出微米或毫米级的粒子在液体中易沉降,堵塞微柱群通道,而纳米流体在微柱群通道压降小、纳米粒子不易沉淀且单位体积内的热导率更高,但纳米流体的物性只能在短时间内保持稳定不变。无论是常重力还是微重力下沸腾换热,微柱群结构都存在毛细吸引力,可及时向受热面供给液体并且提供稳定的气泡成核位点,有助于提高传热系数。本文提出临界热通量和气泡离开直径的变化规律是微重力下微柱群结构沸腾换热的研究重点。

关键词: 微尺度, 流动, 传热, 结构, 纳米粒子, 微重力

Abstract:

The micro-pin-fin structure can effectively increase the heat transfer area and the degree of flow chaos, which has broad application prospect in aerospace, nuclear power plant, air conditioning and other fields. However, the macroscopic heat transfer mechanism may not be applicable in the microscale due to the influence of the microscale effect, which makes the flow and heat transfer in the microscale field affected by more factors. This study reviewed the effects of different structures, nanoparticles, and different gravity levels on the flow and heat transfer mechanism of micro-pin-fins, and summarized the research results in this area. It reveals that the streamlined micro-pin-fin structure has good heat transfer performance. The particles of micron or millimeter scale are liable to settle in the liquid and block the micro-pin-fin channel, while the pressure drop of nanoparticles in the micro-pin-fin channel is small, and it is not easy to precipitate and the thermal conductivity per unit volume is higher. However, the physical properties of nanofluids can only remain stable for a short period of time. The capillary attraction of the micro-pin-fin structure can supply liquid to the heated surface in time and provide stable bubble nucleation sites when it is boiling heat transfer on the earth or under microgravity, which is helpful to improve the heat transfer coefficient. The critical heat flux and the change rule of bubble departure diameter are the focus of research on micro-pin-fins boiling heat transfer under microgravity.

Key words: microscale, flow, heat transfer, structure, nanoparticles, microgravity

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