非均匀SiO_2-H_2O纳米流体辐射特性研究
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摘要
建立具有梯度折射率的SiO_2-H_2O纳米流体辐射传递模型,利用间断有限元法求解其在持续脉冲辐射下的透射率、反射率。通过与均匀纳米流体的透射率、反射率进行对比,分析非均匀纳米流体对辐射吸收效果的影响。同时考虑非均匀条件下折射率梯度、SiO_2质量分数以及颗粒粒径对纳米流体的反射率及透射率的影响。结果表明:当纳米流体具有梯度折射率时,反射率及透射率均减小,吸收率从30%提高到了41. 9%;而折射率梯度的增大使得反射率及透射率进一步减小; SiO_2质量分数和颗粒粒径的增大则导致反射率增大,透射率减小。
In this article,a gradient refractive index radiation transfer model of SiO_2-H_2O nanofluids was established,the transmittance and reflectivity of the nanofluids against the background of continuous impulse radiation were obtained through the discontinuous finite element method. The absorption effect of heterogeneous nanofluids was studied by comparing with the transmittance and reflectivity of homogeneous nanofluids. At the same time,the effects of the refractive index gradient,mass fraction and particle size on the reflectance and transmittance of nanofluids were also analyzed. The results show that the reflectivity and transmittance will decrease for the nanofluids which have gradient index,and the absorptivity will be increased from 30% to 41. 9%; the increase of the refractive index gradient will make the reflectivity and transmittance reduce further; the increase of mass fraction and particle size will bring about the increase of reflectivity and the decrease of transmittance.
In this article,a gradient refractive index radiation transfer model of SiO_2-H_2O nanofluids was established,the transmittance and reflectivity of the nanofluids against the background of continuous impulse radiation were obtained through the discontinuous finite element method. The absorption effect of heterogeneous nanofluids was studied by comparing with the transmittance and reflectivity of homogeneous nanofluids. At the same time,the effects of the refractive index gradient,mass fraction and particle size on the reflectance and transmittance of nanofluids were also analyzed. The results show that the reflectivity and transmittance will decrease for the nanofluids which have gradient index,and the absorptivity will be increased from 30% to 41. 9%; the increase of the refractive index gradient will make the reflectivity and transmittance reduce further; the increase of mass fraction and particle size will bring about the increase of reflectivity and the decrease of transmittance.
引文
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12 Xu G Y,Chen C,Zhang X S,et al.Journal of Southeast University(Natural Science Edition),2016,46(6),1221(in Chinese).徐国英,陈彩,张小松,等.东南大学学报(自然科学版),2016,46(6),1221.
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