Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles
J. A. EastmanMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439Soo-Chang ChoiEnergy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439Shuai LiMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439William W. YuEnergy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439L. J. ThompsonMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
2001en
ABI
Abstract
It is shown that a “nanofluid” consisting of copper nanometer-sized particles dispersed in ethylene glycol has a much higher effective thermal conductivity than either pure ethylene glycol or ethylene glycol containing the same volume fraction of dispersed oxide nanoparticles. The effective thermal conductivity of ethylene glycol is shown to be increased by up to 40% for a nanofluid consisting of ethylene glycol containing approximately 0.3 vol % Cu nanoparticles of mean diameter <10 nm. The results are anomalous based on previous theoretical calculations that had predicted a strong effect of particle shape on effective nanofluid thermal conductivity, but no effect of either particle size or particle thermal conductivity.
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