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Round-robin test on thermal conductivity measurement of ZnO nanofluids and comparison of experimental results with theoretical bounds.

Lee WH, Rhee CK, Koo J, Lee J, Jang SP, Choi SU, Lee KW, Bae HY, Lee GJ, Kim CK, Hong SW, Kwon Y, Kim D, Kim SH, Hwang KS, Kim HJ, Ha HJ, Lee SH, Choi CJ, Lee JH - Nanoscale Res Lett (2011)

Bottom Line: Ethylene glycol (EG)-based zinc oxide (ZnO) nanofluids containing no surfactant have been manufactured by one-step pulsed wire evaporation (PWE) method.Round-robin tests on thermal conductivity measurements of three samples of EG-based ZnO nanofluids have been conducted by five participating labs, four using accurate measurement apparatuses developed in house and one using a commercial device.The results have been compared with several theoretical bounds on the effective thermal conductivity of heterogeneous systems.

View Article: PubMed Central - HTML - PubMed

Affiliation: Mechanical and Industrial Engineering Department, University of Illinois at Chicago, Chicago, IL, USA. suschoi@uic.edu.

ABSTRACT
Ethylene glycol (EG)-based zinc oxide (ZnO) nanofluids containing no surfactant have been manufactured by one-step pulsed wire evaporation (PWE) method. Round-robin tests on thermal conductivity measurements of three samples of EG-based ZnO nanofluids have been conducted by five participating labs, four using accurate measurement apparatuses developed in house and one using a commercial device. The results have been compared with several theoretical bounds on the effective thermal conductivity of heterogeneous systems. This study convincingly demonstrates that the large enhancements in the thermal conductivities of EG-based ZnO nanofluids tested are beyond the lower and upper bounds calculated using the models of the Maxwell and Nan et al. with and without the interfacial thermal resistance.

No MeSH data available.


Thermal conductivity enhancement of EG-based ZnO nanofluids as a function of nanoparticle volume fraction.
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Figure 5: Thermal conductivity enhancement of EG-based ZnO nanofluids as a function of nanoparticle volume fraction.

Mentions: Figure 5 shows the thermal conductivity enhancement of EG-based ZnO nanofluids at a temperature of 23°C as a function of nanoparticle volume fraction. Each data point represents the ratio of the ensemble average of enhancements measured by the participating labs at a given volume fraction to the thermal conductivity of base fluid. The error bars show the standard deviation from the ensemble average. The ZnO nanofluids show very significant increases in thermal conductivity, with a nearly 25% increase for 5.5 vol.% ZnO nanoparticles.


Round-robin test on thermal conductivity measurement of ZnO nanofluids and comparison of experimental results with theoretical bounds.

Lee WH, Rhee CK, Koo J, Lee J, Jang SP, Choi SU, Lee KW, Bae HY, Lee GJ, Kim CK, Hong SW, Kwon Y, Kim D, Kim SH, Hwang KS, Kim HJ, Ha HJ, Lee SH, Choi CJ, Lee JH - Nanoscale Res Lett (2011)

Thermal conductivity enhancement of EG-based ZnO nanofluids as a function of nanoparticle volume fraction.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211320&req=5

Figure 5: Thermal conductivity enhancement of EG-based ZnO nanofluids as a function of nanoparticle volume fraction.
Mentions: Figure 5 shows the thermal conductivity enhancement of EG-based ZnO nanofluids at a temperature of 23°C as a function of nanoparticle volume fraction. Each data point represents the ratio of the ensemble average of enhancements measured by the participating labs at a given volume fraction to the thermal conductivity of base fluid. The error bars show the standard deviation from the ensemble average. The ZnO nanofluids show very significant increases in thermal conductivity, with a nearly 25% increase for 5.5 vol.% ZnO nanoparticles.

Bottom Line: Ethylene glycol (EG)-based zinc oxide (ZnO) nanofluids containing no surfactant have been manufactured by one-step pulsed wire evaporation (PWE) method.Round-robin tests on thermal conductivity measurements of three samples of EG-based ZnO nanofluids have been conducted by five participating labs, four using accurate measurement apparatuses developed in house and one using a commercial device.The results have been compared with several theoretical bounds on the effective thermal conductivity of heterogeneous systems.

View Article: PubMed Central - HTML - PubMed

Affiliation: Mechanical and Industrial Engineering Department, University of Illinois at Chicago, Chicago, IL, USA. suschoi@uic.edu.

ABSTRACT
Ethylene glycol (EG)-based zinc oxide (ZnO) nanofluids containing no surfactant have been manufactured by one-step pulsed wire evaporation (PWE) method. Round-robin tests on thermal conductivity measurements of three samples of EG-based ZnO nanofluids have been conducted by five participating labs, four using accurate measurement apparatuses developed in house and one using a commercial device. The results have been compared with several theoretical bounds on the effective thermal conductivity of heterogeneous systems. This study convincingly demonstrates that the large enhancements in the thermal conductivities of EG-based ZnO nanofluids tested are beyond the lower and upper bounds calculated using the models of the Maxwell and Nan et al. with and without the interfacial thermal resistance.

No MeSH data available.