光热转换中几何复杂性对纳米流体辐射特性影响的数值研究

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2024-10-12 DOI:10.1016/j.solmat.2024.113194

Qianru Yang , Chenghu Zhang , Sixu Liu , Shijie You

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引用次数: 0

摘要

介质的辐射特性对于太阳能直接驱动的光热应用至关重要，因此有必要通过添加纳米粒子（NPs）来开发高性能纳米流体（NFs），以提高能源效率。由于 NPs 的形状和尺寸会对 NFs 介质的散射和吸收行为产生重大影响，本研究的目的是对 TiN NPs 的几何复杂性对具有局部表面等离子体共振效应的 NFs 的辐射特性和光热转换效率的影响进行数值研究。结果表明，与其他形状的 NPs 相比，立方 NPs 具有更宽的吸收带和更高的共振峰，从而改善了太阳吸收和光热转换，太阳加权吸收系数（SWAC）为 41.3%。通过分析微观 NPs 在特定波长下的散射行为，揭示了宏观介质对热辐射消光的响应。对于具有相同特征尺寸和形状系数的 NPs，形状的不同导致 SWAC 的变化高达 37.4%，而对于具有相同形状系数和有效半径的 NPs，SWAC 的变化仅为 2.9%。这项研究为根据 NPs 的形状系数和有效半径对光热性能进行规范化评估提供了新的见解，对于在实际应用中通过优化 NPs 和 NFs 介质的几何参数来提高光热转换效率具有重要意义。

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Numerical investigation on the impact of geometric complexity on radiative properties of nanofluid in photothermal conversion

Radiative properties of medium are crucial for direct solar energy-driven photothermal applications, which necessitates development of high-performance nanofluids (NFs) by adding nanoparticles (NPs) to enhance energy efficiency. Sicne the shape and size of NPs have major impacts on the scattering and absorption behaviors of the NFs medium, the objective of this study is to perform numerical investigation on the impact of geometric complexity of TiN NPs on radiative properties of NFs with localized surface plasmon resonance effects and photothermal conversion efficiency. The results showed that the cubic NPs had broader absorption bands and higher resonance peaks compared with other shapes, leading to improved solar absorption and photothermal conversion, indicated by solar-weighted absorption coefficient (SWAC) of 41.3%. The response of macroscopic medium to thermal radiation extinction was revealed by analyzing the scattering behavior of microscopic NPs at specific wavelengths. For NPs with the same feature size and shape factor, differences in shape led to variation of SWAC by up to 37.4%, while for NPs with the same shape factor and effective radius, the SWAC was changed by only 2.9%. This study offers new insights into normalizing evaluation of photothermal performance based on shape factors and effective radii of NPs, which has important implications for improving photothermal conversion efficiency by optimizing geometric parameters of NPs and NFs medium in practical applications.

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.