纳米流体在回路型重力热管中的沸腾传热特性

摘要/Abstract

摘要： 对回路型重力热管蒸发段中氧化铜-水纳米流体的沸腾传热特性进行了试验，分别讨论了纳米颗粒的质量分数wCuO，工作压力p等参数对沸腾换热系数和临界热流密度的影响.结果表明：母液中添加适当浓度的纳米颗粒可以同时强化沸腾换热系数和临界热流密度；工作压力对沸腾换热系数有显著影响，而对临界热流密度的影响十分微弱;热管蒸发段的临界热流密度随wCuO的增加而增加，在wCuO>1.0%后保持稳定；而沸腾换热系数也随wCuO的增加而增加，在wCuO>1.0%后反而逐渐降低.临界热流密度强化机理主要来自于纳米颗粒在加热表面形成的吸附层；而沸腾换热系数强化与吸附层和纳米流体自身物性变化均有关系.

关键词: 纳米流体, 沸腾, 热管, 强化换热, 流动沸腾

Abstract: An experimental study was performed to understand the boiling characteristics of CuOwater nanofluids in a thermosyphon loop. Experiments were carried at varied subatmospheric pressures. Effects of the mass concentration and the operating pressure on the heat transfer characteristics were mainly discussed. The results indicate that nanofluids can enhance both the boiling heat transfer coefficient (HTC) and the critical heat flux(CHF). The effect of the operating pressure on the heat transfer coefficient is obvious, while the effect is weak on CHF. There exists an optimal mass concentration of nanoparticles, which corresponds to the largest HTC enhancement. The HTC enhancement results from the effects of both the coating layer and the working fluids. The CHF enhancement results mainly from the coating layer formed by nanoparticles during the heating process.

Key words: nanofluid; , boiling, thermosyphon loop, heat transfer enhancement, flow boiling

中图分类号:

TK124

刘振华, 杨雪飞. 纳米流体在回路型重力热管中的沸腾传热特性[J]. 上海交通大学学报（自然版）, 2011, 45(06): 890-894.

LIU Zhen-Hua, YANG Xue-Fei. Boiling Heat Transfer Characteristics of Nanofluids in a Thermosyphon Loop[J]. Journal of Shanghai Jiaotong University, 2011, 45(06): 890-894.

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