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Effect of interfacial thermal resistance and nanolayer on estimates of effective thermal conductivity of nanofluids
- Source :
- Case Studies in Thermal Engineering, Vol 12, Iss, Pp 454-461 (2018)
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- © 2018 The Authors. Colloidal suspensions of nanoparticles (nanofluids) are materials of interest for thermal engineering, because their heat transfer properties are typically enhanced as compared to the base fluid one. Effective medium theory provides popular models for estimating the overall thermal conductivity of nanofluids based on their composition. In this article, the accuracy of models based on the Bruggeman approximation is assessed. The sensitivity of these models to nanoscale interfacial phenomena, such as interfacial thermal resistance (Kapitza resistance) and fluid ordering around nanoparticles (nanolayer), is considered for a case study consisting of alumina nanoparticles suspended in water. While no significant differences are noticed for various thermal conductivity profiles in the nanolayer, a good agreement with experiments is observed with Kapitza resistance ≈ 10-9 m2K/W and sub-nanometer nanolayer thickness. These results confirm the classical nature of thermal conduction in nanofluids and highlight that future studies should rather focus on a better quantification of Kapitza resistance at nanoparticle-fluid interfaces, in order to allow bottom up estimates of their effective thermal conductivity. ispartof: CASE STUDIES IN THERMAL ENGINEERING vol:12 pages:454-461 status: published
- Subjects :
- ENTROPY GENERATION
Materials science
Nanolayer
Kapitza resistance
020209 energy
Nanoparticle
02 engineering and technology
Effective medium approximation
Nanofluid
ENHANCEMENT
Thermal conductivity
SOLAR COLLECTOR
HEAT-TRANSFER
Thermal engineering
0202 electrical engineering, electronic engineering, information engineering
WATER
Interfacial thermal resistance
Composite material
Engineering (miscellaneous)
Nanoscopic scale
Fluid Flow and Transfer Processes
Science & Technology
021001 nanoscience & nanotechnology
Thermal conduction
PARTICLE-SIZE
MODEL
Nanolayer, Kapitza resistance, Nanofluid, Effective medium approximation, Thermal conductivity
MULTISCALE SIMULATION APPROACH
LAYER
lcsh:TA1-2040
Physical Sciences
Heat transfer
Thermodynamics
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Case Studies in Thermal Engineering, Vol 12, Iss, Pp 454-461 (2018)
- Accession number :
- edsair.doi.dedup.....822c0a1c2748b480ad1414e88b83a565