Abstract
In this paper we report an observation of an unusual frequencydependent enhancement of the heat transport parameter (Cpκ,Cp = heat capacityand κ = thermal conductivity) of a nanofluid containing ZnO nanoparticles of an average size of 10 nm (volumefraction≤1.5%) in ethanol. Theenhancement of Cpκ at lowfrequency is substantial. Cpκ becomes frequency independent at low frequency but it shows a strong dependence on themeasuring frequency where it decreases as the frequency is increased. The enhancementalso depends on the temperature and also scales with the concentration of ZnO. Thisfrequency dependent thermal conductivity of nanofluids cannot be explained by theclassical effective medium theory. A new model has to be developed to explain the abovephenomenon. We have suggested local aggregation as the likely cause that may give rise tothe observed frequency dependence.
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