Thermal conductivity of CNT water based nanofluids: experimental trends and models overview
1GCGM EA3913, Equipe Matériaux et ThermoRhéologie, Université Rennes 1, IUT de Rennes, 3 rue du Clos Courtel, BP 90422 35704 Rennes Cedex 7, France
2Polymont, 106 avenue Jean Moulin City, State, 78170 La Celle St Cloud, France
3LGCGM EA3913, Equipe Matériaux et Thermo-Rhéologie, Université Rennes 1, IUT de Saint-Malo, Rue de la Croix Désilles, CS51713 35417 Saint-Malo Cedex, France
J Ther Eng 2015; 1(2): 381-390
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Abstract

Thermal conductivity measurement of carbon nanotubes water-based nanofluids is here reported. We have considered in particular the influence of nanoparticle volume fraction, temperature, carbon nanotube aspect ratio and different kind of surfactant (SDBS, Lignin, Sodium polycarboxylate) on thermal conductivity enhancement of nanofluids. The experiments show that TC enhancement of nanofluids produces at very low volume fraction. It is also mainly governed by both volume fraction and temperature increase. However, TC enhancement of nanofluids is weakly affected by carbon nanotubes aspect ratio and surfactant type used in the study. In addition, various theoretical thermal conductivity models are used to possibly correlate the experimental data and explain the TC enhancement of nanofluids. The selected models do not capture the experimental findings within the range of this parametric study, evidencing the need to develop appropriate model for TC enhancement prediction of CNT nanofluids and measure TC of this kind of nanofluids before performing numerical studies in heat exchangers and cavities.