Details
| Original language | English |
|---|---|
| Article number | 48 |
| Journal | International Journal of Thermophysics |
| Volume | 40 |
| Issue number | 5 |
| Early online date | 1 Apr 2019 |
| Publication status | Published - May 2019 |
Abstract
Different findings about suitable correlations to describe nanofluid viscosity can be explained based on the research presented in this paper. The effective viscosity of nanofluids is crucial when nanofluids are considered as heat carrier fluids. Despite many publications, however, no consensus about suitable correlations could be found in past years. Particularly, the impact of the shear rate on the viscosity is being discussed controversially. It is shown in this paper that these different findings can be explained considering the theory for the rheology of suspensions. Any measurement of viscosity over shear rate only shows a section of the entire rheological behavior. Thus, experimental results of shear thinning, Newtonian behavior and shear thickening of nanofluids can all be a part of this overall range of possible shear rates. This hypothesis is validated based on viscosity data from the literature and viscosity measurements over a wide range of shear rates for different nanofluids showing all three types of behavior.
Keywords
- Nanofluids, Shear rate, Shear thickening, Shear thinning, Viscosity
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: International Journal of Thermophysics, Vol. 40, No. 5, 48, 05.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - On the Controversy of Nanofluid Rheological Behavior
AU - Raeisian, Leyla
AU - Eggers, Jan Rudolf
AU - Lange, Eckart Matthias
AU - Mattke, Torsten
AU - Bode, Andreas
AU - Kabelac, Stephan
PY - 2019/5
Y1 - 2019/5
N2 - Different findings about suitable correlations to describe nanofluid viscosity can be explained based on the research presented in this paper. The effective viscosity of nanofluids is crucial when nanofluids are considered as heat carrier fluids. Despite many publications, however, no consensus about suitable correlations could be found in past years. Particularly, the impact of the shear rate on the viscosity is being discussed controversially. It is shown in this paper that these different findings can be explained considering the theory for the rheology of suspensions. Any measurement of viscosity over shear rate only shows a section of the entire rheological behavior. Thus, experimental results of shear thinning, Newtonian behavior and shear thickening of nanofluids can all be a part of this overall range of possible shear rates. This hypothesis is validated based on viscosity data from the literature and viscosity measurements over a wide range of shear rates for different nanofluids showing all three types of behavior.
AB - Different findings about suitable correlations to describe nanofluid viscosity can be explained based on the research presented in this paper. The effective viscosity of nanofluids is crucial when nanofluids are considered as heat carrier fluids. Despite many publications, however, no consensus about suitable correlations could be found in past years. Particularly, the impact of the shear rate on the viscosity is being discussed controversially. It is shown in this paper that these different findings can be explained considering the theory for the rheology of suspensions. Any measurement of viscosity over shear rate only shows a section of the entire rheological behavior. Thus, experimental results of shear thinning, Newtonian behavior and shear thickening of nanofluids can all be a part of this overall range of possible shear rates. This hypothesis is validated based on viscosity data from the literature and viscosity measurements over a wide range of shear rates for different nanofluids showing all three types of behavior.
KW - Nanofluids
KW - Shear rate
KW - Shear thickening
KW - Shear thinning
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=85063735511&partnerID=8YFLogxK
U2 - 10.15488/4697
DO - 10.15488/4697
M3 - Article
AN - SCOPUS:85063735511
VL - 40
JO - International Journal of Thermophysics
JF - International Journal of Thermophysics
SN - 0195-928X
IS - 5
M1 - 48
ER -