期刊
APPLIED THERMAL ENGINEERING
卷 155, 期 -, 页码 650-659出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.04.109
关键词
Solar salt; Nanofluids; Force convective heat transfer; Solar energy
资金
- National Natural Science Foundation of China [51676060]
- Science Creative Foundation for Distinguished Young Scholars in Heilongjiang [JC2016009]
- Science Creative Foundation for Distinguished Young Scholars in Harbin [2014RFYXJ004]
Nowadays, molten salts are widely used in concentrated solar plants as working media to transfer and store solar energy. However, the relatively poor thermal properties of molten salts have restricted their further application. Nevertheless, the addition of nanoparticles to molten salts excellently improves these thermal properties. In present work, solar salt-based nanofluids were prepared using a lyophilizer. The specific heat of solar salt-based SiO2 nanofluids was experimentally measured based on the sapphire method, and its heat transfer performance was numerically investigated using the lattice Boltzmann method. Results indicated that an optimum nanoparticle mass fraction that could enhance heat transfer performance existed. This optimum nanoparticle mass fraction, which was found to be 1.0 wt%, improved the heat transfer coefficient and Nu number by 8.58 and 7.29%, respectively. The parameter analysis indicated that the considerably large change in the specific heat dominated the change in heat transfer performance. Meanwhile, the simulation results of the average Nu numbers exhibited good agreement with the Shah-London correlation prediction to within +/- 3.0%, indicating the feasibility of using this correlation in designing heat exchangers that utilize solar salt-based SiO2 nanofluids.
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