Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles

It is shown that a "nanofluid" consisting of copper nanometer-sized particl es dispersed in ethylene glycol has a much higher effective thermal conduct ivity than either pure ethylene glycol or ethylene glycol containing the sa me 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. (C) 2001 American Institute of Physics.