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Properties of mineral oil based silica nanofluids

Properties of mineral oil based silica nanofluids
Properties of mineral oil based silica nanofluids
A nanofluid as intended for use in high voltage engineering is a heat transfer fluid, containing a small fraction of nano-sized filler materials. These nanoparticles exhibit unique properties, compared to those of the same material at the bulk scale. The term "nanofluid" was coined by Choi et al. at Argonne National Laboratory and refers to a colloid fluid, composed of a liquid phase and dispersed nanoparticles in suspension. Nowadays, nanofluids are considered the next generation of heat transfer fluids due to their improved heat transfer properties, compared to conventional fluids. In HV applications nanofluids based on mineral oil are being studied, to determine if they are a suitable replacement for conventional transformer oil or vegetable oil. In this study, mineral oil based silica nanofluids with different concentrations were prepared. The AC breakdown voltage of the nanofluids was tested at different moisture content levels. Silica nanofluids exhibit improved breakdown strength, especially at high moisture content level. The thermal conductivity was measured in the temperature range 10°C to 80°C, with up to 0.1% silica nanoparticles. Despite the reputation of nanofluids of being superior heat transfer fluids, only a negligible effect on the thermal conductivity of mineral oil could be found.

nanofluid, weibull analysis, breakdown strength, moisture content, silica, thermal conductivity, viscosity
1100-1108
Jin, Huifei
1b0ff54e-4caf-4213-bb1c-48808ec0d59e
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Tsekmes, Ioannis A.
05d06ba8-ab0c-4ad9-a7c3-a996740632df
Kochetov, Roman
9132fe00-0536-4082-a4ce-54253b2e9fe0
Morshuis, Peter H.
f0ef43df-e127-4cf8-9257-e314e4095397
Smit, Johan J.
2a25b796-b15f-485c-b10d-08a813481c42
Jin, Huifei
1b0ff54e-4caf-4213-bb1c-48808ec0d59e
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Tsekmes, Ioannis A.
05d06ba8-ab0c-4ad9-a7c3-a996740632df
Kochetov, Roman
9132fe00-0536-4082-a4ce-54253b2e9fe0
Morshuis, Peter H.
f0ef43df-e127-4cf8-9257-e314e4095397
Smit, Johan J.
2a25b796-b15f-485c-b10d-08a813481c42

Jin, Huifei, Andritsch, Thomas, Tsekmes, Ioannis A., Kochetov, Roman, Morshuis, Peter H. and Smit, Johan J. (2014) Properties of mineral oil based silica nanofluids. IEEE Transactions on Dielectrics & Electrical Insulation, 21 (3), 1100-1108. (doi:10.1109/TDEI.2014.6832254).

Record type: Article

Abstract

A nanofluid as intended for use in high voltage engineering is a heat transfer fluid, containing a small fraction of nano-sized filler materials. These nanoparticles exhibit unique properties, compared to those of the same material at the bulk scale. The term "nanofluid" was coined by Choi et al. at Argonne National Laboratory and refers to a colloid fluid, composed of a liquid phase and dispersed nanoparticles in suspension. Nowadays, nanofluids are considered the next generation of heat transfer fluids due to their improved heat transfer properties, compared to conventional fluids. In HV applications nanofluids based on mineral oil are being studied, to determine if they are a suitable replacement for conventional transformer oil or vegetable oil. In this study, mineral oil based silica nanofluids with different concentrations were prepared. The AC breakdown voltage of the nanofluids was tested at different moisture content levels. Silica nanofluids exhibit improved breakdown strength, especially at high moisture content level. The thermal conductivity was measured in the temperature range 10°C to 80°C, with up to 0.1% silica nanoparticles. Despite the reputation of nanofluids of being superior heat transfer fluids, only a negligible effect on the thermal conductivity of mineral oil could be found.

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More information

Accepted/In Press date: 29 January 2014
e-pub ahead of print date: 16 June 2014
Published date: 16 June 2014
Keywords: nanofluid, weibull analysis, breakdown strength, moisture content, silica, thermal conductivity, viscosity
Organisations: EEE

Identifiers

Local EPrints ID: 366564
URI: http://eprints.soton.ac.uk/id/eprint/366564
PURE UUID: db69164e-c855-4565-bd47-37a5a27302aa
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 07 Jul 2014 08:32
Last modified: 10 Dec 2019 01:35

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