Journal
POWDER TECHNOLOGY
Volume 379, Issue -, Pages 373-383Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2020.10.089
Keywords
Hybrid nanofluids; Surfactant; Rheological behavior; Viscosity, thermal conductivity
Categories
Funding
- National Natural Science Foundation of China [51806090, 51666006]
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The study found that increasing the concentration of surfactant can improve the stability and viscosity of hybrid nanofluids. Among the surfactants tested, PVP showed the highest stability and contributed to the highest thermal conductivity enhancement at optimal concentrations.
Adding surfactant can improve the stability of hybrid nanofluids. However, positive or negative effects of the surfactant on the thermophysical properties of hybrid nanofluids should be further investigated. In the present study, effects of different surfactants, including SDS, PVP and CTAB, with various mass concentrations and temperatures on the stability of Al2O3-CuO/Water (W) and Al2O3-TiO2/Water (W) hybrid nanofluids are investigated. Results show that increment of surfactant concentration improves the stability and viscosity. Then obtained results from UV-Vis Spectrophotometer, TEM and sedimentation methods are compared, and PVP surfactant has the highest degree of stability, with the minimal sedimentation up to 25 days. At the optimum PVP surfactant concentrations of 0.005 wt% and 0.01 wt%, the maximum thermal conductivity enhancement is 12% and 14% at 60 degrees C for Al2O3-CuO/W and Al2O3-TiO2/W hybrid nanofluids. Therefore, adding even little amount of surfactant can improve the stability and thermal conductivity of hybrid nanofluids. (C) 2020 Elsevier B.V. All rights reserved.
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