| 摘要: |
| 采用两步法配制了Cu-H2O、Co-H2O、MWCNT-H2O三种纳米流体，利用紫外-可见-近红外分光光度计结合积分球原理测试了不同粒径、不同质量分数、不同光程的上述纳米流体在太阳能全波段（250nm< <2500nm）的透射率。结果表明，三种纳米流体的透射率都要比水的小，并且纳米流体的透射率随着粒径的增大以及质量分数的增加而降低，随着光程的减小而增大。在相同质量分数条件下，MWCNT-H2O透射率最小，在250～775nm波段，Co-H2O的透射率要高于Cu-H2O的，而在775～1370nm波段, Co-H2O的透射率要低于Cu-H2O的，表明不同粒子在不同波段具有不同的光吸收性能。 |
| 关键词: 纳米流体 太阳能 辐射 透射率 |
| DOI： |
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| 基金项目: |
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| Experimental Investigation on Radiation Characteristic of Nanofluids |
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He Qinbo1,2, Wang Shuangfeng2, Zeng Shequan2, Zheng Zhaozhi1
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| (1.Guangdong University Heat Pump Engineering Technology Development Center, Shunde Polytechnic;2.Key Lab of Enhanced Heat Transfer and Energy Conservation, the Ministry of Education, South China University of Technology) |
| Abstract: |
| In this article, Cu-H2O, Co-H2O, MWCNT-H2O nanofluids were prepared through two-step method. The transmittance of nanofluids over solar spectrum (250 to 2500nm) was measured by the UV-Vis-NIR spectrophotometer based on integrating sphere principle. The factors of various particle size, mass fraction and optical path influencing transmittance of nanofluids were investigated. The experimental results show that the transmittance of the three nanofluids is much less than that of deionized water. The transmittance decreased with the nanoparticle size and mass fraction increasing, but increased with the optical path length reducing. With the same mass fraction, the transmittance of MWCNT-H2O nanofluids is the minimum. The transmittance of Co-H2O nanofluids is higher than that of Cu-H2O during 250～775nm wavelength, while inverse during 775～1370nm wavelength. It indicates that different particle has diverse light absorption properties during different wavelength. |
| Key words: nanofluids solar energy radiation transmittance |
