摘要
以乙二醇为基液和还原剂,四氯化锡、氯铂酸为氧化剂,采用微流控法合成了铂锡合金纳米流体,并添加了不同比例的聚乙烯吡咯酮(PVP)作为表面活性剂,分别利用紫外可见分光光度计和Hot Disk热物性分析仪测得纳米流体的吸光度值和导热系数,分析了反应温度及PVP的添加比对纳米流体的稳定性、热导率的影响.结果表明,纳米流体导热系数的增长率随反应温度的升高近乎呈现线性增长,虽然稳定性略有下降,但影响不大.添加不同比例的表面活性剂可以有效改善纳米流体的稳定性和导热性能,但存在最佳的添加比例.反应温度为200℃,添加PVP的量为Pt、Sn物质的量浓度和的4倍时制得的铂锡合金纳米流体在温度为60℃下的导热性能提高幅度最大,相比于乙二醇提高了约15.1%.
The PtSn nanofluid was synthesized by microfluidic method,using EG as the base liquid and reducing agent,SnCl4·5H2O and H2 PtCl6·6H2 O as oxidants.Different proportions polyvinylpyrrolidone(PVP)were added as surfactants.The absorbance and thermal conductivity of nanofluids were measured by UV/VIS Spectrophotometer and Hot Disk thermal property analyzer,respectively.The effects of reaction temperature and PVP addition ratio on the stability and thermal conductivity of nanofluids were analyzed.Results reveal that the thermal conductivity growth rate of the nanofluid increases almost linearly with the increase of the reaction temperature,although the stability decreases slightly,and the effect is not significant.Adding different proportion of surfactants can improve the stability and thermal conductivity of nanofluids effectively,but there is a best proportion.When the reaction temperature is 200℃ and the amount of PVP added is 4 times the sum of the amount-of-substance of Pt and Sn,the thermal conductivity of PtSn nanofluids is greatly improved at the temperature of 60℃,which is about 15.1% higher than that of EG.
作者
夏国栋
李奥
马丹丹
XIA Guodong;LI Ao;MA Dandan(MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation and Beijing Key Laboratory of Heat Transfer and Energy Conversion,College of Enviromental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2021年第9期1056-1063,共8页
Journal of Beijing University of Technology
基金
北京市自然科学基金委-北京市教育委员会联合基金重点资助项目(KZ201810005006)
中国博士后基金资助项目(2019M660375)。
作者简介
夏国栋(1965-),男,教授,博士生导师,主要从事微电子设备的冷却及微尺度流动与传热、气液两相流动与传热方面的研究,E-mail:xgd@bjut.edu.cn。
