Effect of nanoparticle aggregation on the thermal radiation properties of nanofluids: an experimental and theoretical study

被引：83

作者：

Chen, J. ^{[1
]}

Zhao, C. Y. ^{[1
]}

Wang, B. X. ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Inst Engn Thermophys, Shanghai 200240, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2020年 / 154卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Nanofluids; Nanoparticle aggregation; Diffusion limited aggregation simulation; Multiple sphere T-matrix method; Monte Carlo method; MONTE-CARLO SIMULATIONS; OPTICAL-PROPERTIES; SCATTERING; CONDUCTIVITY; ABSORPTION; CONVERSION; LIQUID; MATRIX;

D O I：

10.1016/j.ijheatmasstransfer.2020.119690

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nanofluids show significant enhancement in the absorption of solar energy. However, little work has been done on the effect of nanoparticle aggregation on the thermal radiation properties of nanofluids up to now. In this work, we systematically investigate the thermal radiation properties of nanofluids with nanoparticle aggregation from experiment and theory. On the experimental side, titanium dioxide/silver (TiO2@Ag) plasmonic nanofluids are prepared in distilled water and the spectral transmittance of nanofluids with different degrees of aggregation is measured. The result shows that the size of aggregated nanoparticle cluster has a significant effect on the absorption of nanofluids. On the theoretical side, a theoretical model is developed to calculate the thermal radiation properties of nanofluids with nanoparticle aggregation. By applying the multiple sphere T-matrix (MSTM) method and the Monte Carlo (MC) method, we investigate the effects of nanoparticle aggregation, cluster fractal dimensions and cluster sizes on the thermal radiation properties of nanofluids. The results indicate that our theoretical model can predict the thermal radiation properties of nanofluids with nanoparticle aggregation more reasonably. This is of great significance to understand the mechanism that affects the thermal radiation properties of nanofluids and to actively design nanofluids. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：9

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