银铜合金纳米流体的热物性影响因素分析

Analysis of Influencing Factors on Thermophysical Properties of Silver Copper Alloy Nanofluids

本文通过液相还原法制备了水基银铜合金纳米流体,并对其吸光度、热导率和黏度进行了实验测试。结果表明,在前驱体注射流量为0.5 mL/min、反应温度为70℃和表面活性剂聚乙烯吡络烷酮(PVP)摩尔比为7的制备条件下,纳米流体的吸光度峰值呈现最高值;随着注射流量和反应温度的增加,纳米流体的热导率均呈先增大后减小的趋势,当注射流量为0.5mL/min、流体温度为80℃时,热导率提高了16.81%;当反应温度为70℃、流体温度为40℃时,纳米流体热导率相比于去离子水提高了12.16%;纳米流体的黏度随注射流量的增加而增加,反应温度对纳米流体黏度有重要影响,在反应温度为80℃时,所制备的纳米流体黏度最高,其相比于25℃去离子水黏度增加了30%。

In this paper,water-based silver copper alloy nanofluids were prepared by liquid phase reduction method,and their absorbance,thermal conductivity and viscosity were tested.The results showed that when the injection flow rate of precursor was 0.5 m L/min,the reaction temperature was70℃and the molar ratio of surfactant polyvinylpyrrolidone(PVP)was 7,the peak absorbance of nanofluids showed the highest value;With the increase of injection flow and reaction temperature,the thermal conductivity of nanofluids increased first and then decreased.When the injection flow was 0.5 mL/min and the fluid temperature was 80℃,the thermal conductivity increased by 16.81%;When the reaction temperature is 70℃and the fluid temperature is 40℃,the thermal conductivity of nanofluids is 12.16%higher than that of deionized water;The viscosity of nanofluids increases with the increase of injection flow rate.The reaction temperature has an important effect on the viscosity of nanofluids.When the reaction temperature is 80℃,the viscosity of the prepared nanofluids is the highest,which is 30%higher than that of deionized water at 25℃.