化工学报 ›› 2012, Vol. 63 ›› Issue (5): 1409-1414.DOI: 10.3969/j.issn.0438-1157.2012.05.013

• 流体力学与传递现象 • 上一篇    下一篇

纳米流体黏度特性

凌智勇1,邹涛1,丁建宁1,2,3,程广贵1,张忠强1,孙东建1,钱龙1   

  1. 1江苏大学微纳米科学技术研究中心;2常州大学低维材料微纳器件与系统研究中心;3常州市新能源工程重点实验室
  • 收稿日期:2011-11-08 修回日期:2012-02-15 出版日期:2012-05-05 发布日期:2012-05-05
  • 通讯作者: 邹涛

Shear viscosity of nanofluids mixture

LING Zhiyong1,ZOU Tao1,DING Jianning1,2,3,CHENG Guanggui1, ZHANG Zhongqiang1,SUN Dongjian1,QIAN Long1   

  1. 1Center of Micro/Nano Science & Technology,Jiangsu University;2Center of Low-Dimension Material,Micro/Nano Device and System,Changzhou University;3Key Laboratory of New Energy Engineering
  • Received:2011-11-08 Revised:2012-02-15 Online:2012-05-05 Published:2012-05-05

关键词: 纳米流体, 温度, 分散剂, 体积分数, 黏度

Abstract: The influences of temperature,chemical dispersant,and volume fraction of nanoparticles on the shear viscosity of the nanoparticle-fluid mixture were experimentally investigated.The nanofluids including different types of nanoparticles were prepared by a two-steps method.The results showed that the shear viscosity of the mixture decreased with increasing temperature below a threshold of 60℃. Interestingly,the viscosity of Cu-water and Al2O3-water nanofluids increased with increasing temperature above 60℃.The Brownian motion was enhanced as temperature increased,and the moving of the nanoparticles covering surfactants would increase the viscosity.The viscosity hysteresis between the heating and cooling processes could be observed obviously.The shear viscosity of CuO-water nanofluid in this experiment was in good agreement with fluid dynamics continuum theory for the fluids without dispersant.After the dispersant was added in CuO-water nanofluid,the experimental value of shear viscosity was larger than the theoretical data.And the varying trend of viscosity was consistent with that of the dispersant.The use of surfactant had an important role in the calculation of viscosity.The viscosity of nanofluids increased with increasing particle volume fraction,but the viscosity increments for the nanofluids with the same particle volume fraction were not the same.So density,surface electrical and diameter of the nanoparticles should be considered when calculating the viscosity of nanofluids.

Key words: nanofluids, temperature, dispersant, volume fraction, viscosity

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