We report measurements of the thermal conductivity of aqueous suspensions of aluminum oxide nanoparticles with nominal diameters of , , and and at volume concentrations up to 10%. Potential complications in the pulsed transient hot-wire technique for characterizing nanofluids are examined, which motivate the development of a microhot strip setup with a small thermal time constant. The average particle size is monitored for samples subjected to different durations of sonication and the thermal conductivity is determined at two different temperatures for each of the samples. The present data do not reveal any anomalous enhancement in the thermal conductivity previously reported for comparable nanofluids. The concentration dependence of the thermal conductivity can be explained using the conventional effective medium model with a physically reasonable set of parameters.
1.
Eastman
, J. A.
, Choi
, S. U. S.
, Li
, S.
, Yu
, W.
, and Thompson
, L. J.
, 2001, “Anomalously Increased Effective Thermal Conductivities of Ethylene Glycol-Based Nanofluids Containing Copper Nanoparticles
,” Appl. Phys. Lett.
0003-6951, 78
(6
), pp. 718
–720
.2.
Eastman
, J. A.
, Phillpot
, S. R.
, Choi
, S. U. S.
, and Keblinski
, P.
, 2004, “Thermal Transport in Nanofluids
,” Annu. Rev. Mater. Res.
1531-7331, 34
, pp. 219
–246
.3.
Keblinski
, P.
, Eastman
, J. A.
, and Cahill
, D. G.
, 2005, “Nanofluids for Thermal Transport
,” Mater. Today
1369-7021, 8
(36
), pp. 36
–44
.4.
Wang
, B.-X.
, Zhou
, L.-P.
, and Peng
, X.-F.
, 2003, “A Fractal Model for Predicting the Effective Thermal Conductivity of Liquid With Suspension of Nanoparticles
,” Int. J. Heat Mass Transfer
0017-9310, 46
, pp. 2665
–2672
.5.
Prasher
, R.
, Phelan
, P. E.
, and Bhattacharya
, P.
, 2006, “Effect of Aggregation Kinetics on the Thermal Conductivity of Nanoscale Colloidal Solutions (Nanofluid)
,” Nano Lett.
1530-6984, 6
(7
), pp. 1529
–1534
.6.
Prasher
, R.
, Evans
, W.
, Meakin
, P.
, Fish
, J.
, Phelan
, P.
, and Keblinski
, P.
, 2006, “Effect of Aggregation on Thermal Conduction in Colloidal Nanofluids
,” Appl. Phys. Lett.
0003-6951, 89
, 143119
.7.
Prasher
, R.
, Bhattacharya
, P.
, and Phelan
, P. E.
, 2005, “Thermal Conductivity of Nanoscale Colloidal Solutions (Nanofluids)
,” Phys. Rev. Lett.
0031-9007, 94
, 025901
.8.
Chon
, C. H.
, Kihm
, K. D.
, Lee
, S. P.
, and Choi
, S. U. S.
, 2005, “Empirical Correlation Finding the Role of Temperature and Particle Size for Nanofluid (Al2O3) Thermal Conductivity Enhancement
,” Appl. Phys. Lett.
0003-6951, 87
, 153107
.9.
Krishnamurthy
, S.
, Bhattacharya
, P.
, Phelan
, P. E.
, and Prasher
, R. S.
, 2006, “Enhanced Mass Transport in Nanofluids
,” Nano Lett.
1530-6984, 6
(3
), pp. 419
–423
.10.
Li
, C. H.
, and Peterson
, G. P.
, 2006, “Experimental Investigation of Temperature and Volume Fraction Variations on the Effective Thermal Conductivity of Nanoparticle Suspensions (Nanofluids)
,” J. Appl. Phys.
0021-8979, 99
, 084314
.11.
Putnam
, S. A.
, Cahill
, D. G.
, and Braun
, P. V.
, Ge
, Z.
, and Shimmin
, R. G.
, 2006, “Thermal Conductivity of Nanoparticle Suspensions
,” J. Appl. Phys.
0021-8979, 99
(8
), 084308
.12.
Rusconi
, R.
, Rodari
, E.
, and Piazza
, R.
, 2006, “Optical Measurements of the Thermal Properties of Nanofluids
,” Appl. Phys. Lett.
0003-6951, 89
, 261916
.13.
Venerus
, D. C.
, Kabadi
, M. S.
, Lee
, S.
, and Perez-Luna
, V.
, 2006, “Study of Thermal Transport in Nanoparticle Suspension Using Forced Rayleigh Scattering
,” J. Appl. Phys.
0021-8979, 100
, 094310
.14.
Patel
, H. E.
, Das
, S. K.
, Sundararajan
, T.
, Nair
, A. S.
, George
, B.
, and Pradeep
, T.
, 2003, “Thermal Conductivities of Naked and Monolayer Protected Metal Nanoparticle Based Nanofluids: Manifestation of Anomalous Enhancement and Chemical Effects
,” Appl. Phys. Lett.
0003-6951, 83
(14
), 2931
–2933
.15.
Gustafsson
, S. E.
, Karawacki
, E.
, and Chohan
, M. A.
, 1986, “Thermal Transport Studies of Electrically Conducting Materials Using the Transient Hot-Strip Technique
,” J. Phys. D
0022-3727, 19
(5
), pp. 727
–735
.16.
Incropera
, R. P.
, DeWitt
, D. P.
, Bergman
, T. L.
, and Lavine
, A. S.
, 2007, Introduction to Heat Transfer
, 5th ed., Wiley
, New York
.17.
Vadasz
, P.
, 2006, “Heat Conduction in Nanofluid Suspensions
,” ASME J. Heat Transfer
0022-1481, 128
(5
), pp. 465
–477
.18.
Nan
, C.-W.
, Birringer
, R.
, Clarke
, D. R.
, and Gleiter
, H.
, 1997, “Effective Thermal Conductivity of Particulate Composites With Interfacial Thermal Resistance
,” J. Appl. Phys.
0021-8979, 81
(10
), pp. 6692
–6699
.19.
Hung
, M.-T.
, Choi
, O.
, Guo
, Z.
, Hahn
, H. T.
, and Ju
, Y. S.
, 2006, “Heat Transport in Graphite Nanoplatelet (GNP)-Reinforced Polymeric Nanocomposites and Aluminum Oxide Nanofluids
,” Proceedings of the 9th AIAA∕ASME Joint Thermophysics and Heat Transfer Conference, San Francisco, CA
, Jun. 5–8, Paper No. AIAA 2006-3112.20.
Tomaru
, T.
, Suzuki
, T.
, Uchiyama
, T.
, Yamamoto
, A.
, Shintomi
, T.
, Taylor
, C. T.
, Yamamoto
, K.
, Miyoki
, S.
, Ohashi
, M.
, and Kuroda
, K.
, 2002, “Maximum Heat Transfer Along a Sapphire Suspension Fiber for a Cryogenic Interferometric Gravitational Wave Detector
,” Phys. Lett. A
0375-9601, 301
, pp. 215
–219
.21.
Ju
, Y. S.
, 2005, “Impact of Nonequilibrium Between Electrons and Phonons on Heat Transfer in Metallic Nanoparticles Suspended in Dielectric Media
,” ASME J. Heat Transfer
0022-1481, 127
(12
), pp. 1400
–1402
.22.
Hong
, T.-K.
, Yang
, H.-S.
, and Choi
, C. J.
, 2005, “Study of the Enhanced Thermal Conductivity of Fe Nanofluids
,” J. Appl. Phys.
0021-8979, 97
, 064311
.23.
Waite
, T. D.
, Cleaver
, J. K.
, and Beattie
, J. K.
, 2001, “Aggregation Kinetics and Fractal Structure of γ-Alumina Assemblages
,” J. Clim.
0894-8755, 241
, pp. 333
–339
.24.
Das
, S. K.
, Putra
, N.
, Thiesen
, P.
, and Roetzel
, W.
, 2003, “Temperature Dependence of Thermal Conductivity Enhancement for Nanofluids
,” ASME J. Heat Transfer
0022-1481, 125
(4
), pp. 567
–574
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