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Rheological and thermal transport characteristics of a transformer oil based ferrofluid

Paulovičová, K. ; Tóthová, J. ; Rajňák, M. ; Wu, Z. LU ; Sundén, B. LU ; Wadsö, L. LU ; Tobiáš, T. ; Kopčansky, P. ; Timko, M. and Lisý, V. (2018) In Acta Physica Polonica A 133(3). p.564-566
Abstract

Ferrofluids based on insulating liquids are intensively studied as a potential substitute of liquid dielectric in high voltage technologies. In this work we focus on the experimental investigation of flow and thermal transport characteristics of a ferrofluid based on transformer oil (Mogul) and iron oxide nanoparticles. The magneto-rheological behavior of the ferrofluid was studied by a rotational rheometer in the shear rate range from 1 to 1000 s-1 and magnetic field up to 1 T. By means of a thermal constants analyzer and a transient plane source method we obtained the thermal conductivity, specific heat and thermal diffusivity values for the studied oil and the ferrofluid. It is shown that the Newtonian character of the... (More)

Ferrofluids based on insulating liquids are intensively studied as a potential substitute of liquid dielectric in high voltage technologies. In this work we focus on the experimental investigation of flow and thermal transport characteristics of a ferrofluid based on transformer oil (Mogul) and iron oxide nanoparticles. The magneto-rheological behavior of the ferrofluid was studied by a rotational rheometer in the shear rate range from 1 to 1000 s-1 and magnetic field up to 1 T. By means of a thermal constants analyzer and a transient plane source method we obtained the thermal conductivity, specific heat and thermal diffusivity values for the studied oil and the ferrofluid. It is shown that the Newtonian character of the ferrofluid changes to a non-Newtonian with application of the magnetic field. The notable magneto-viscous effect has been observed especially at low shear rates. We found that the doping of the transformer oil by 3 wt% of the nanoparticles results in a thermal conductivity enhancement by about 3.2%.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Acta Physica Polonica A
volume
133
issue
3
pages
3 pages
publisher
Institute of Physics, Polish Academy of Sciences
external identifiers
  • scopus:85045153990
ISSN
0587-4246
DOI
10.12693/APhysPolA.133.564
language
English
LU publication?
yes
id
75342840-74c3-4ea6-9110-4f076b7423a0
date added to LUP
2018-04-20 14:53:48
date last changed
2020-03-24 06:10:33
@article{75342840-74c3-4ea6-9110-4f076b7423a0,
  abstract     = {<p>Ferrofluids based on insulating liquids are intensively studied as a potential substitute of liquid dielectric in high voltage technologies. In this work we focus on the experimental investigation of flow and thermal transport characteristics of a ferrofluid based on transformer oil (Mogul) and iron oxide nanoparticles. The magneto-rheological behavior of the ferrofluid was studied by a rotational rheometer in the shear rate range from 1 to 1000 s<sup>-1</sup> and magnetic field up to 1 T. By means of a thermal constants analyzer and a transient plane source method we obtained the thermal conductivity, specific heat and thermal diffusivity values for the studied oil and the ferrofluid. It is shown that the Newtonian character of the ferrofluid changes to a non-Newtonian with application of the magnetic field. The notable magneto-viscous effect has been observed especially at low shear rates. We found that the doping of the transformer oil by 3 wt% of the nanoparticles results in a thermal conductivity enhancement by about 3.2%.</p>},
  author       = {Paulovičová, K. and Tóthová, J. and Rajňák, M. and Wu, Z. and Sundén, B. and Wadsö, L. and Tobiáš, T. and Kopčansky, P. and Timko, M. and Lisý, V.},
  issn         = {0587-4246},
  language     = {eng},
  month        = {03},
  number       = {3},
  pages        = {564--566},
  publisher    = {Institute of Physics, Polish Academy of Sciences},
  series       = {Acta Physica Polonica A},
  title        = {Rheological and thermal transport characteristics of a transformer oil based ferrofluid},
  url          = {http://dx.doi.org/10.12693/APhysPolA.133.564},
  doi          = {10.12693/APhysPolA.133.564},
  volume       = {133},
  year         = {2018},
}