太阳能集热Co-H_2O纳米流体比热容特性实验研究  

Specific Heat Capacity of Co-H_2O Nanofluid for Solar Heat Collection: An Experimental Study

作　　者：闫格尼 何钦波[1] Yah Geni;He Qinbo(Guangdong University Heat Pump Engineering Technology Development Center Shunde Polytechnic, Foshan 528333, Chin)

机构地区：[1]顺德职业技术学院广东高校热泵工程技术开发中心,佛山528333

出　　处：《真空科学与技术学报》2017年第11期1108-1112,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金面上项目(51246006);广东省自然科学基金项目(2016A030313012)

摘　　要：采用两步法制配了Co-H_2O纳米流体,实验研究了纳米颗粒质量分数、直径、温度对纳米流体比热容的影响。结果表明:去离子水的比热随着纳米颗粒的添加不断减小,质量分数为0.1%和0.2%的Co-H_2O纳米流体比热比去离子水分别降低了2.88%和5.76%。随着温度的升高,纳米流体的比热容逐渐增大,并且纳米流体质量分数越大,其比热随温度变化的趋势相对低浓度的纳米流体越明显。粒径越小的纳米流体比热容越大。现有比热容计算模型与实验结果相差较大,不能直接用于计算。The Co-H2O nanofluid was prepared by mixing Co-nanoparticles,dispersion agent and de-ionized water. The impact of the temperature,size and mass fraction of Co nano-particles on the specific heatcapacity of CoH2O nanofluids was theoretically analyzed and experimentally measured. The experimental results show that depending on the size and mass fraction,the Co nanoparticles significantly decreased the specific heatcapacity of de-ionized water. For example,the specific heat capacity of the Co-H2O nanofluid with mass fractions of 0. 1 wt% and 0.2 wt% were 2. 88% and 5. 76% lower than that of deionized water,respectively; the specific heat capacity of the CoH2O nanofluid increased with a decrease of the Co nanoparticle size. Besides,as the temperature increased,the specific heat capacity of Co-H2O nanofluid increased; a higher Co mass fraction resulted in a faster increasing rate.Large discrepancy was found between the calculated and measured results.

关 键 词：纳米流体 太阳能 比热容 Co-H2O DSC 

分 类 号：TK121[动力工程及工程热物理—工程热物理]