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A new heat propagation velocity prevails over Brownian particle velocities in determining the thermal conductivities of nanofluids.

Kihm KD, Chon CH, Lee JS, Choi SU - Nanoscale Res Lett (2011)

Bottom Line: An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids.The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities.This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA. kkihm@utk.edu.

ABSTRACT
An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids. The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities. In contrast, the present model proposes a faster heat transfer velocity at the same order as the speed of sound, rooted in a modified kinetic principle. In addition, this model accounts for both nanoparticle heat dissipation as well as coagulation effects. This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data.

No MeSH data available.


Related in: MedlinePlus

Predictions of the present model with corresponding experimental data for various Al2O3 and CuO nanofluid samples [6,10,24].
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Figure 3: Predictions of the present model with corresponding experimental data for various Al2O3 and CuO nanofluid samples [6,10,24].

Mentions: In contrast, the present model of Equation 7 shows consistent agreement with the experimental data not only for both nanofluids but for all the tested conditions of temperatures and volume concentrations. Furthermore, Figure 3 demonstrates the comprehensiveness of the present model of Equation 7 in comparison with published experimental data for both Al2O3 and CuO nanofluids from different leading groups [6,10,24].


A new heat propagation velocity prevails over Brownian particle velocities in determining the thermal conductivities of nanofluids.

Kihm KD, Chon CH, Lee JS, Choi SU - Nanoscale Res Lett (2011)

Predictions of the present model with corresponding experimental data for various Al2O3 and CuO nanofluid samples [6,10,24].
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211451&req=5

Figure 3: Predictions of the present model with corresponding experimental data for various Al2O3 and CuO nanofluid samples [6,10,24].
Mentions: In contrast, the present model of Equation 7 shows consistent agreement with the experimental data not only for both nanofluids but for all the tested conditions of temperatures and volume concentrations. Furthermore, Figure 3 demonstrates the comprehensiveness of the present model of Equation 7 in comparison with published experimental data for both Al2O3 and CuO nanofluids from different leading groups [6,10,24].

Bottom Line: An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids.The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities.This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA. kkihm@utk.edu.

ABSTRACT
An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids. The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities. In contrast, the present model proposes a faster heat transfer velocity at the same order as the speed of sound, rooted in a modified kinetic principle. In addition, this model accounts for both nanoparticle heat dissipation as well as coagulation effects. This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data.

No MeSH data available.


Related in: MedlinePlus