RT Journal Article
T1 Rheology of Solar-Salt based nanofluids for concentrated solar power. Influence of the salt purity, nanoparticle concentration, temperature and rheometer geometry
A1 Muñoz-Sánchez, Belén
A1 Nieto-Maestre, Javier
A1 Veca, Elisabetta
A1 Liberatore, Raffaele
A1 Sau, Salvatore
A1 Navarro, Helena
A1 Ding, Yulong
A1 Navarrete, Nuria
A1 Juliá, J. Enrique
A1 Fernández, Ángel G.
A1 García-Romero, Ana
AB Solar Salt-based nanofluids have attracted significant scientific interest in recent years due to their improved thermal properties, making them strong candidates as thermal energy storage materials and/or heat transfer fluids in CSP plants. There have been reports on increased specific heat due to the addition of nanoparticles, however, there is a lack of comprehensive information on other essential properties affecting the heat transfer, such as the viscosity. This article concerns the rheological behaviour of nanofluids made of Solar Salt (mass percentage at 60% NaNO3 – 40% KNO3) as the base fluid and silica or alumina nanoparticles as additives. The evolution of these nanofluids viscosity as a function of the shear rate (1–1000 s−1) at a temperature range of 250–400 °C was measured and analysed. The impact of the salt purity (refined or industrial grade), the nanoparticle concentration (0.5–1.5 wt%) and the rheometer measuring configuration (coaxial cylinder or parallel plate) are examined. The results showed in general a Newtonian behaviour of the nanofluids with independency of the rheometer configuration. The relationship between the viscosity and the temperature follows an Arrhenius model. The influence of the nanoparticle concentration on the viscosity of the refined grade Solar Salt is analysed according to the Maron-Pierce and Kriegher-Dougherty models for the nanofluids containing alumina and silica nanoparticles respectively, due to their different shape.
SN 0927-0248
YR 2018
FD 2018-03
LK https://hdl.handle.net/11556/4245
UL https://hdl.handle.net/11556/4245
LA eng
NO Muñoz-Sánchez , B , Nieto-Maestre , J , Veca , E , Liberatore , R , Sau , S , Navarro , H , Ding , Y , Navarrete , N , Juliá , J E , Fernández , Á G & García-Romero , A 2018 , ' Rheology of Solar-Salt based nanofluids for concentrated solar power. Influence of the salt purity, nanoparticle concentration, temperature and rheometer geometry ' , Solar Energy Materials and Solar Cells , vol. 176 , pp. 357-373 . https://doi.org/10.1016/j.solmat.2017.10.022
NO Publisher Copyright: © 2017 Elsevier B.V.
NO The authors wish to acknowledge the University of the Basque Country (UPV/EHU) for supporting the PhD of Belén Muñoz-Sánchez and her research stay at the Universidad de Antofagasta, the NanoUptake COST project for supporting the STSM of Belén Muñoz-Sánchez and Nuria Navarrete at the University of Birmingham . This work was supported by the European Union Seventh Framework Programme FP7/2007-2013 [grant agreement no. 609837 , STAGE-STE project]; European Union Framework Programme Horizon 2020 [COST Action CA15119 , Nanouptake – Overcoming Barriers to Nanofluids Market Uptake].
DS TECNALIA Publications
RD 30 jul 2024