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首页> 外文期刊>International Journal of Heat and Mass Transfer >Extinction coefficient of aqueous nanofluids containing multi-walled carbon nanotubes
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Extinction coefficient of aqueous nanofluids containing multi-walled carbon nanotubes

机译：包含多壁碳纳米管的水性纳米流体的消光系数

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摘要

This paper experimentally investigates the extinction coefficients of water-based multi-walled carbon nanotubes (MWCNT) nanofluids for application in direct-absorption solar collectors (DASC). As a solar thermal energy absorbing medium, water-based MWCNT nanofluids with low volume fraction are prepared and their extinction coefficients are initially measured using Lambert-Beer law at a fixed wavelength (632.8 nm). The results show that the incident solar energy can be completely absorbed in the penetration depth of 10 cm using the nanofluids with extremely low volume fraction of 0.0005 Vol.%. The study demonstrates that the extinction coefficients of water-based MWCNT nanofluids increase linearly with the volume concentration of MWCNT in the range from 0.0005 to 0.005 Vol.%. The extinction coefficients including present and previous data are compared with the theoretical models which are the Maxwell-Garnett for cylinder and the Rayleigh scattering approximation. Based on the results, it is clearly shown that the conventional Maxwell-Garnett model which can consider the shape effect is inaccurate for predicting the extinction coefficient of nanofluids. However the Rayleigh scattering approximation which can consider size effect can qualitatively predict the extinction coefficient of water-based MWCNT nanofluids.
机译：本文实验研究了用于直接吸收式太阳能集热器（DASC）的水基多壁碳纳米管（MWCNT）纳米流体的消光系数。作为太阳能热吸收介质，制备了体积分数低的水基MWCNT纳米流体，并使用朗伯-比尔定律在固定波长（632.8 nm）上初步测量了它们的消光系数。结果表明，使用0.0005 Vol。％的极低体积分数的纳米流体可以在10 cm的穿透深度中完全吸收入射的太阳能。研究表明，水基MWCNT纳米流体的消光系数随MWCNT的体积浓度在0.0005至0.005 Vol。％范围内线性增加。将包括当前数据和先前数据的消光系数与理论模型（圆柱体的Maxwell-Garnett和瑞利散射近似）进行比较。从结果可以清楚地看出，传统的考虑形状效应的麦克斯韦-加纳特模型对于预测纳米流体的消光系数是不准确的。然而，可以考虑尺寸效应的瑞利散射近似可以定性地预测水性MWCNT纳米流体的消光系数。

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