Microtech 2011

A Comparative Study of Nanofluids Exchanging Heat with a Thermal Energy Reservoir

J.A.R. Parise
Pontificia Universidade Catolica do Rio de Janeiro, BR

Keywords: nanofluid, heat exchanger


A comparative study of nanofluids exchanging heat with a thermal energy reservoir Parise, J.A.R. Pontifícia Universidade Católica do Rio de Janeiro parise@puc-rio.br For their enhanced thermal conductivity and heat transfer characteristics, considerable attention has been recently given to nanofluids, engineered colloids made of nanoparticles dispersed on a base fluid. A literature survey shows that much more attention has been given to the thermal conductivity of nanofluids rather than their heat transfer characteristics. However, one of the main applications of nanofluids as heat transfer fluids would be in heat exchangers, where the other thermal resistances, as well as the increased viscosity, would attenuate the nanofluid advantages. A more realistic approach is here attempted, where a general model for the heat exchange between a nanofluid and thermal energy reservoir is provided. A comparative analysis of the heat transfer rate and pumping power is carried out between a nanofluid and its pure base fluid. Non-dimensional gain factors were defined thus providing a more realistic and general view of the potential of nanofluids when applied in heat exchangers.

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