Progress of research on visualization of internal procedure of two-phase closed thermosyphon and its heat transfer enhancement

doi:10.16085/j.issn.1000-6613.2017.03.004

Abstract

Abstract:

Two-phase closed thermosyphon(TPCT) contains two phase flow and phase change process. The traditional theory analysis and experimental study cannot intuitively give concretize process including two phase flow,heat and mass transfer and evaporation-condensation phase transformation. This paper introduced common TPCT heat transfer model,generalized theoretical research on heat transfer and fluid flow in condensation section,insulation section and evaporation section,and summarized the actuality of visual research on its internal procedure by experimental and numerical computation method. Computational fluid dynamics(CFD) makes it possible to do numerical visualization research on TPCT with actual interior situation of TPCT guaranteed. Besides,the paper presented domestic and foreign CFD research findings and simulation level and pointed out the domestic research on TPCT using CFD method lagged behind relatively. Meanwhile,the heat transfer enhancement method of TPCT was summarized systematically,especially the efficient fluid medium with the fouling problem solved in the course of heat transfer enhancement. The research status and focus on the heat transfer enhancement of nanofluid and self-wetting fluid were introduced emphatically. Lastly,CFD method was suggested to do numerical visualization analysis on concrete details of TPCT internal flow course,evaporation and condensation,and heat and mass transfer. The combining of experimental result,theoretical calculation and numerical research pioneered a new way to go deep into TPCT interior mechanism.

Key words: two-phase closed thermosyphon, flow and heat transfer, phase change, visualization, numerical simulation, heat transfer enhancement

摘要：

两相闭式热虹吸管（TPCT）内部包含两相流和相变过程，传统的理论分析和实验研究不能直观地给出其内部两相流流动、热质传递以及蒸发冷凝相变的具体过程。本文介绍了常用的TPCT传热模型，并分别对冷凝段、绝热段和蒸发段传热流动过程的理论研究进行归纳总结。综述了实验和数值研究方法对其内部过程的可视化研究现状，流体力学数值计算软件（CFD）为在保证TPCT内部真实情况下对其进行数值可视化研究提供了可能，给出了国内外的CFD研究成果和仿真水平，指出国内在采用CFD的方法对其研究相对滞后。同时，对TPCT的强化传热方法进行系统总结，尤其是高效流体工质较好地解决了强化传热过程中的污垢问题，重点介绍了纳米流体和自润湿流体强化传热的研究现状和焦点。最后，提出采用CFD方法对TPCT内部流动过程、蒸发冷凝和传热传质具体细节进行数值可视化分析，将实验结果、理论计算以及数值研究三者结合，为深入其内部机理研究开辟了新思路。

关键词: 两相闭式热虹吸管, 流动与传热, 相变, 可视化, 数值模拟, 强化传热

CLC Number:

TK172.4

ZHANG Haisong, XIE Guowei, ZHAN Hongren, BI Shihui. Progress of research on visualization of internal procedure of two-phase closed thermosyphon and its heat transfer enhancement[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 791-801.

张海松, 谢国威, 战洪仁, 毕仕辉. 两相闭式热虹吸管内部过程可视化及其强化传热研究进展[J]. 化工进展, 2017, 36(03): 791-801.

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