【作者】 金翼； 曹建国； 苍大强； 丁玉龙；

【Author】 JIN Yi~(1,2),Cao Jianguo~3,Cang Daqiang~2,Ding Yulong~3 1 Institute of Process Engineering,Chinese Academy of Sciences,Beijing,100090,China 2 School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;Beijing 100083,China; 3 Institute of Particle Science and Engineering,the University of Leeds,Leeds,LS2 9JT,UK

【机构】 中国科学院过程工程研究多相复杂系统国家重点实验室； 北京科技大学冶金与生态工程学院； 利兹大学颗粒科学与工程学院；

【摘要】 本课题正对多种水和乙二醇混合液为基液的TiO₂纳米颗粒悬浮液流变性能进行了研究,其中颗粒的体积百分浓度分别为0,0.5,1,1.5和2,基液的浓度分别为:100:0、7:25、50:50、75:25、以及100:0（水:乙二醇的体积比例）。采用两步法制备了稳定的纳米颗粒悬浮液,流变性能测试的结果显示,无论对水基的,25%乙二醇基液以及50%乙二醇基液的纳米颗粒悬浮液来说,都表现出了轻微的非牛顿流体特性,在较低剪切速率的情况下悬浮液呈现出剪切变薄的特性,而这种非牛顿现象与颗粒的浓度以及基液的粘度大小有关。而且随着剪切速率的增加,纳米流体均呈现出了近似牛顿流体的现象,而悬浮液的粘度的增加值和颗粒的浓度有关,但与基液的粘度以及温度的变化没有明显的关系。更多还原

【Abstract】 This work aims to understand the rheological behaviour of suspensions of TiO₂ nanoparticles in water-ethylene glycol mixtures.Extensive experiments have been carried out to investigate the effects of particle concentrations over 0-2 vol%and water concentration in the base liquid over 0-99 vol%.The two-step method was used in preparing the suspensions and the suspensions were found to be very stable.The results indicate the non-Newtonian behaviour of water based,25%EG based and 50%EG based suspensions with clear shear thinning at low shear rates.The shear viscosity was found to be strongly dependent on the effective particle concentration and viscosity of the base liquid but independent on the temperature in this work condition.更多还原