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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

无机纳米流体的热物性及其测试新方法的研究

蔡岸1; 刘震炎1; 奚同庚2; 谢华清2; 周新宇2   

  1. 1. 上海交通大学机械与动力工程学院, 上海 200030; 2. 中国科学院上海硅酸盐研究所, 上海 200050
  • 收稿日期:2003-08-12 修回日期:2003-09-17 出版日期:2004-09-20 网络出版日期:2004-09-20

Thermal Properties of Abionanofliuds and Its New Testing Method

CAI An1; LIU Zhen-Yan1; XI Tong-Geng2; XIE Hua-Qing2; ZHOU Xin-Yu2   

  1. 1.School of Mechanical Engineering; Shanghai Jiaotong University; Shanghai 200030; China; 2.Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2003-08-12 Revised:2003-09-17 Published:2004-09-20 Online:2004-09-20

PDF (PC)

1160

被引次数

13

摘要： 研究了一种能同时测量纳米流体导热系数λ、导温系数α和比热Cp的非稳态多功能测试新方法,它结合了单丝法准确测量导热系数和双丝法准确测量导温系数的优点.对几种液体的导热系数和导温系数的实测值与TPRC推荐值进行比较,最大偏差分别为-0.4％和-2.7％.导热系数和导温系数测试均方根误差分别<±0.5％和±3％.并用此法测量了纳米Al2O3流体和纳米TiO2流体的热物性参数,结果表明在流体中加入无机纳米粉体后其入和α较分散介质均有明显提高,加和原理不完全适用于纳米流体比热计算.

关键词: 无机纳米流体, 热物性, 热丝法

Abstract: A new multifunctional method which integrates the transient hot-wire technique and hot-wire parallel
technique for determining the thermal conductivity and thermal diffusivity of abionanofluids was presented. The maximum deviation of thermal conductivity
and diffusivity between experimental results and TPRC-recommended values was --0.4% and --2.7% respectively. The accuracy of the measurement was estimated ±0.5% and ±3%
respectively. The experimental results showed that the thermal conductivity and the thermal diffusivity of nanofluids α-Al2O3 in ethylene glycol (EG) and TiO2 in water
were anomalously higher than those of EG and water. The heat capacity of nanofluids TiO2 in water was 10.4% higher than predicted.

Key words: nanofliuds, thermal property, hot-wire technique

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