上海交通大学学报

上海交通大学学报（自然版）

• 能源与动力工程 • 上一篇    下一篇

碳纳米管悬浮液在微槽道热管中的应用

覃超，刘振华   

  1. （上海交通大学 机械与动力工程学院， 上海 200240）
  • 收稿日期:2009-04-29 修回日期:1900-01-01 出版日期:2010-04-29 发布日期:2010-04-29

Application of Carbon Nanotube Suspensions in a Micro Grooved Heat Pipe

QIN Chao，LIU Zhenhua   

  1. （School of Mechanical Engeering， Shanghai Jiaotong University, Shanghai 200240, China）
  • Received:2009-04-29 Revised:1900-01-01 Online:2010-04-29 Published:2010-04-29

摘要： 在稳定运行压力条件下，对水基多壁碳纳米管(MWNT)悬浮液为工质的水平轴向微槽道热管换热特性进行实验分析.结果表明：由水基MWNT替代去离子水后，热管性能得到改善，壁面平均温度明显下降；微槽道热管的蒸发换热系数最大提高80％；最大热流密度提高25％；热管总热阻下降了50%左右.运行压力对热管换热性能有明显影响，压力越小，MWNT悬浮液对换热特性的强化作用越显著.热管热阻和最大换热能力均随MWNT浓度的增加而提高，而当MWNT浓度增加到一定值后又随之下降，最佳浓度在2.0％左右.

关键词: 碳纳米管, 纳米流体, 热管, 微槽道, 换热强化

Abstract: An experiment was carried out to study the heat transfer performance of an axially microgrooved heat pipe using water based multiwalled carbon nanotube (MWNT) suspensions as the working fluid. The effects of the MWNT mass concentration and the operating pressure on the evaporation and condensation heat transfer coefficients, the maximum heat flux and the total heat resistance of the heat pipe were investigated and discussed. The experimental results show that MWNT suspensions can apparently improve the thermal performance of the heat pipe and there is an optimal MWNT mass concentration of about 2.0 % to achieve the maximum heat transfer enhancement. The operating pressure has a significant influence on the enhancement of heat transfer coefficients, and slight influences on the enhancement of the maximum heat flux. Under the pressure of 7.45 kPa, the evaporation heat transfer coefficient and the maximum heat flux for the MWNT suspension can be enhanced up most by about 80% and 25% respectively compared to those for water.

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