低浓度水基多壁碳纳米管纳米流体的流变特性

doi:10.11896/cldb.19070053

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Abstract The investigation of the rheological properties of nanofluids helps to understand the energy transport mechanism of nanofluids. The rheological properties such as viscosity, thixotropy, and viscosity hysteresis phenomenon of MWCNT/tap and MWCNT/distilled (DI) water nanofluids are experimentally studied at five different low volume fractions (0.004 7%, 0.023 8%, 0.047%, 0.071 4%, 0.095%) by using an advanced rheometer. The results show that the viscosity of nanofluids is higher than that of the base liquid, which increases with the solid volume fraction increasing and temperature decreasing; however, the relative viscosity is independent of temperature. Furthermore, it is found that the concentration of 0.047% is regarded as a critical point suggesting the transition from Newtonian fluid to shear thinning non-Newtonian fluid and the flow characteristics could be described very well by the power-law model. The rheological properties of MWCNT/water are not affected by the properties of the base liquid and there is no thixotropic behavior when the temperature is lower than 335 K. Besides, temperature sweep tests demonstrate that the viscosity hysteresis phenomenon caused by high temperature is observed in the case of MWCNT/tap nanofluid. Finally, based on the experimental data, a new and accurate correlation is proposed to predict the relative viscosity of MWCNT/water which can provide a reference for the work associated with the fluid flow simulation of nanofluids.

Key words： nanofluids MWCNT non-Newtonian fluid viscosity viscosity hysteresis phenomenon

Published: 02 December 2020

CLC number:

O373

Fund:This work was sponsored by the National Key R&D Program of China (2019YFB1504301) and the National Natural Science Foundation of China (11972105, 11172059).

About author:: Li Yu, doctoral student of Dalian University of Techno-logy, focusing on the rheological properties and thermal mass transfer characteristics of nanofluids and non-Newtonian fluids.Yongning Bian, professor, supervisor of master's candidates. The research direction mainly includes the instability theory of fluid flow, the strengthening tech-nology of mass heat transfer process and the rheological property measurement and flow characteristics of non-Newtonian fluid

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	YU Li
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Cite this article:

YU Li,BIAN Yongning,LIU Yang, et al. Rheological Characteristics of Low Concentrated MWCNT/Water Nanofluids[J]. Materials Reports, 2020, 34(22): 22010-22014.

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http://www.mater-rep.com/EN/10.11896/cldb.19070053 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22010

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