导热油基TiO2纳米流体热物性研究

• 作 者: 史继媛 刘宗明 李金凯 李莉 赵蔚琳
• 机 构: 济南大学材料科学与工程学院,
• 出 处: 硅酸盐通报
• 发表日期: 2016年10期
• 关键词: 导热油 TiO2纳米流体 导热性能 粘性 润湿性

采用“两步法”将粒径为15 nm、30 nm和60 nm的TiO_2纳米粉添加到导热油中,制备出体积分数为0.1%~0.5%的导热油基TiO_2纳米流体。实验研究了其在20~60℃的导热性能、粘性和润湿性能,结果表明,该导热油基TiO_2纳米流体的导热性能随着温度的升高增加率为20%~38%,随着体积分数的增大提高了7%~49%,随着TiO_2纳米粉粒径的增加降低了9%~25%。与基液相比,该导热油基TiO_2纳米流体的粘性随着温度和体积分数的增加也增大了3%~37%,但随着温度的升高纳米流体的粘性却呈线性降低趋势,随着TiO_2纳米粉粒径的增加降低了7%~22%。室温下,导热油基TiO_2纳米流体的接触角比基液减小了28%~50%,表面张力却增加了0.3%~0.5%。

TiO 2 nanoparticles with particle size of 15 nm, 30 nm and 60 nm were added into the HTF using the “two-step method” to prepare the HTF nano-fluid with the volume fraction of 0.1% ~ 0.5%. The thermal conductivity, viscosity and wettability at 20 ~ 60 ℃ were investigated experimentally. The results show that the thermal conductivity of the HTF nanofluids increases with the increase of temperature from 20% to 38% The increase of fraction increased by 7% ~ 49%, with the increase of TiO_2 nanopowder diameter decreased by 9% ~ 25%. Compared with the base fluid, the viscosity of the HTF nano-fluid also increased 3% -37% with the increase of temperature and volume fraction, but the viscosity of nanofluid decreased linearly with the increase of temperature. With the increase of TiO_2 nanopowder size, it decreased by 7% ~ 22%. At room temperature, the contact angle of HTF nanofluids decreased by 28% ~ 50% and the surface tension increased by 0.3% ~ 0.5%.