SiO_2纳米流体透射率影响因素实验研究  

Experimental study of influencing factors on transmissivity of SiO_2 nanofluids

作　　者：王辉[1] 骆仲泱 蔡洁聪[1] 王涛[1] 赵佳飞[1] 倪明江[1] 

机构地区：[1]浙江大学清洁能源利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2010年第6期1143-1148,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50676082);中国博士后科学基金资助项目(20080441248)

摘　　要：利用高压微射流法制备了多种SiO2纳米流体,并用分光光度计结合积分球原理测试了不同粒径、不同体积分数及不同光程下SiO2纳米流体在太阳能辐射全波段的透射率.比较实验结果发现,SiO2纳米流体的颗粒粒径,以及其体积分数的不同对纳米流体的透射率有不同程度的影响.通过定制不同厚度的样品池,测试不同光程下SiO2纳米流体的透射率.实验发现:7nmSiO2纳米流体的透射率随光程的变化仍符合朗伯-比尔定律,而40nmSiO2纳米流体由于颗粒散射加剧导致结果偏离朗伯-比尔定律.High performance nanofluids were produced by a microfluidizer,and a spectrophotometer basing the integral ball principle was used to measure the transmissivity of SiO2 nanofluids in total solar irradiance band with various particle sizes,volume fraction and optical path. By analyzing the experimental results,it was observed that the physical characteristics of nanofluids such as particle sizes,volume fraction and optical path would affect the transmissivity of SiO2 nanofluids. The measurement of the transmissivity of SiO2 nanofluids with different optical path was realized by using different thick sample pools. The results indicated that the transmissivity variation of the 7 nm SiO2 nanofluids with the different optical paths obeyed the Labbert-Beer law,however,not happened when the diameter was 40 nm for particle dispersion.

关 键 词：SiO2纳米流体 透射率 粒径 体积分数 光程 

分 类 号：TK121[动力工程及工程热物理—工程热物理]