Abstract
Nanofluid is a novel heat transfer fluid prepared by dispersing nanometer-sized solid particles in a traditional heat transfer fluid for heat transfer enhancement. The microstructure investigation of nanofluids by rheological techniques shows that the particles do not exist as individual particles and nanofluids of rodlike alumina nanoparticles have a sol- or weakly flocculated gel-structure depending on particle concentration. The rate of thermal conductivity increase with concentration is faster in the sol state than in the weakly flocculated gel state. When the nanofluid becomes a strongly flocculated gel thermal conductivity remains almost the same as the pure liquid value. It is concluded that the Brownian motion plays a key role in enhancing thermal conductivity. The present study is the first report on the thermal conductivity of nanofluids with the characterized dispersion status.
| Original language | English |
|---|---|
| Article number | 034316 |
| Journal | Journal of Applied Physics |
| Volume | 110 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2011 Aug 1 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Rheological properties of alumina nanofluids and their implication to the heat transfer enhancement mechanism. / Kim, Seokwon; Kim, Chongyoup; Lee, Wook Hyun; Park, Seong Ryong.
In: Journal of Applied Physics, Vol. 110, No. 3, 034316, 01.08.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Rheological properties of alumina nanofluids and their implication to the heat transfer enhancement mechanism
AU - Kim, Seokwon
AU - Kim, Chongyoup
AU - Lee, Wook Hyun
AU - Park, Seong Ryong
PY - 2011/8/1
Y1 - 2011/8/1
N2 - Nanofluid is a novel heat transfer fluid prepared by dispersing nanometer-sized solid particles in a traditional heat transfer fluid for heat transfer enhancement. The microstructure investigation of nanofluids by rheological techniques shows that the particles do not exist as individual particles and nanofluids of rodlike alumina nanoparticles have a sol- or weakly flocculated gel-structure depending on particle concentration. The rate of thermal conductivity increase with concentration is faster in the sol state than in the weakly flocculated gel state. When the nanofluid becomes a strongly flocculated gel thermal conductivity remains almost the same as the pure liquid value. It is concluded that the Brownian motion plays a key role in enhancing thermal conductivity. The present study is the first report on the thermal conductivity of nanofluids with the characterized dispersion status.
AB - Nanofluid is a novel heat transfer fluid prepared by dispersing nanometer-sized solid particles in a traditional heat transfer fluid for heat transfer enhancement. The microstructure investigation of nanofluids by rheological techniques shows that the particles do not exist as individual particles and nanofluids of rodlike alumina nanoparticles have a sol- or weakly flocculated gel-structure depending on particle concentration. The rate of thermal conductivity increase with concentration is faster in the sol state than in the weakly flocculated gel state. When the nanofluid becomes a strongly flocculated gel thermal conductivity remains almost the same as the pure liquid value. It is concluded that the Brownian motion plays a key role in enhancing thermal conductivity. The present study is the first report on the thermal conductivity of nanofluids with the characterized dispersion status.
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U2 - 10.1063/1.3622513
DO - 10.1063/1.3622513
M3 - Article
AN - SCOPUS:80051916813
VL - 110
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 3
M1 - 034316
ER -