磁场强化Co-H_2O纳米流体直接光吸收性能实验研究  

Effect of Magnetic Field on Direct Light Absorption of Co-H_2O Nanofluid: An Experimental Study

作　　者：何钦波[1] 闫格尼 郑兆志[1] 汪双凤[2] 

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 [2]华南理工大学传热强化与过程节能教育部重点实验室,广州510641

出　　处：《真空科学与技术学报》2017年第7期720-726,共7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,研究了在不同磁场强度下的纳米流体光热转换特性以及直接吸收式太阳能集热器的集热效率。实验结果表明:磁场可强化Co-H_2O纳米流体的光吸收性能,且最佳磁场强度为3×10^(-3)T。在3×10^(-3)T磁场强度的作用下:质量分数为0.1%、0.04%Co-H_2O纳米流体,相对于去离子水其最高温度分别提升了42.86%和39.5%,质量分数为0.1%Co-H_2O纳米流体,相对于去离子水和未加磁场时最大集热效率分别提高了51.70%和13.24%。上述结果表明磁场在磁性纳米流体光热转换特性方面具有强化促进作用。The effect of the magnetic fieldon the photo-thermal conversion and heat collection efficiency of the direct absorption solar collector,filled with Co-H_2O nano-fluids,was experimentally investigated. The preliminary results show that the magnetic field had a major impact on the enhancement of the light absorption and photo-theraml conversion property of the Co-H_2O nanofluids. To be specific,an optimal magnetic field intensity of 3 × 10^（-3）T increased the highest temperature of the 0. 1 % and 0. 04 %（ wt） Co-H_2O nanofluids by 42. 86 % and 39. 5 %,respectively,relative to that of the deionized water; moreover,the 3 × 10^（-3）T magnetic field increased the maximum heat collection efficiency of 0. 1 % Co-H_2O nano-fluids by 13. 24 %,being51. 70 % higher than that of the de-ionized water. Possible mechanisms responsible for the efficiency enhancement were tentatively discussed.

关 键 词：纳米流体 太阳能 磁场 光热特性 直接吸收式 

分 类 号：TK121[动力工程及工程热物理—工程热物理]