caa a22 4500 605466726 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0838-y doi (NATIONALLICENCE)springer-10.1007/s00397-015-0838-y Experimental investigation on viscosity of water-based Al2O3 and TiO2 nanofluids [Elektronische Daten] [Mariam Jarahnejad, Ehsan Haghighi, Mohsin Saleemi, Nader Nikkam, Rahmatollah Khodabandeh, Björn Palm, Muhammet Toprak, Mamoun Muhammed] This article investigates the influence of temperature, concentration, and size of nanoparticles, and addition of surfactants on dynamic viscosity of water-based nanofluids containing alumina (Al2O3) and titania (TiO2) nanoparticles. Two viscometers, a capillary and a falling ball, were used for the measurements in the temperature range of 20-50°C and the particle concentration of 3-14.3wt.%. The results indicate that the viscosity of nanofluids is reduced by increasing the temperature, similar to their base fluids. Moreover, surfactants, which are used to improve the shelf stability of nanofluids, most likely increase their viscosity. The correlations derived from the linear fluid theory such as Einstein and Batchelor, especially for solid concentration above 1.5wt.% are not accurate to predict viscosity of nanofluids, while the modified Krieger-Dougherty equation estimates viscosity of nanofluids with acceptable accuracy in a specific range of solid particle size to aggregate size. Springer-Verlag Berlin Heidelberg, 2015 Nanofluid nationallicence Viscosity nationallicence Temperature nationallicence Particle size nationallicence Concentration nationallicence Surfactant nationallicence Al2O3 nationallicence TiO2 nationallicence Jarahnejad Mariam Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut Haghighi Ehsan Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut Saleemi Mohsin Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut Nikkam Nader Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut Khodabandeh Rahmatollah Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut Palm Björn Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut Toprak Muhammet Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut Muhammed Mamoun Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 411-422 0035-4511 54:5<411 2015 54 397 https://doi.org/10.1007/s00397-015-0838-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0838-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jarahnejad Mariam Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut NATIONALLICENCE 700 1- Haghighi Ehsan Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut NATIONALLICENCE 700 1- Saleemi Mohsin Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut NATIONALLICENCE 700 1- Nikkam Nader Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut NATIONALLICENCE 700 1- Khodabandeh Rahmatollah Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut NATIONALLICENCE 700 1- Palm Björn Department of Energy Technology, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden aut NATIONALLICENCE 700 1- Toprak Muhammet Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut NATIONALLICENCE 700 1- Muhammed Mamoun Department of Materials and Nano Physics, KTH Royal Institute of Technology, 164 40, Stockholm, Kista, Sweden aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 411-422 0035-4511 54:5<411 2015 54 397