Abstract
In this paper, experimental results on thermal conductivity of TiO₂-Water, TiO₂-Ethylene Glycol and TiO₂-Engine Oil nanofluids in concentration range between 0.25 to 2 volume percent and temperature range of 10–70 °C is presented. Results show that thermal conductivity of nanofluids increases with increasing concentration and lower enhancement is observed with temperature as compared with concentration. Maximum enhancements are 9.3%, 15% and 8.9% for 2% volume of TiO₂ nanoparticles at 70 °C for TiO₂-Water, TiO₂-Ethylene Glycol and TiO₂-Engine Oil nanofluids respectively. 4-input and 1-output Artificial Neural Network (ANN) approach is used to predict thermal conductivity of nanofluids. Experimental results obtained were compared with some theoretical models and ANN approach. It is observed that ANN approach gives better predictions and is in good agreement with experimental results.
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