Empirical Viscosity Modeling for SiO2 and Al2O3Nanofluids  using the Response Surface Method

Faiza Mohamed Nasir; Mohd Zulkifly Abdullah; Mior Firdaus Mior Abdul Majid

Authors

Faiza Mohamed Nasir Mechanical Section, Malaysian Spanish Institute, Universiti Kuala Lumpur, Kulim Hi-Tech Park, 09000 Kedah, Malaysia
Mohd Zulkifly Abdullah School of Mechanical Engineering, Kampus Kejuruteraan, Universiti Sains Malaysia, Nibong Tebal, 14300 Pulau Pinang, Malaysia
Mior Firdaus Mior Abdul Majid School of Mechanical Engineering, Universiti Sains Malaysia, Engineering Campus,14300, Nibong Tebal, Penang, Malaysia

Keywords:

Viscosity, nanofluids, response surface method, central composite design

Abstract

The ability of nanofluids, an engineered fluid, to effectively remove heat has been proven to exceed that of a conventional fluid. However, dynamic viscosity may put a limitation on this ability. This paper presents the results of the experimental measurement of the dynamic viscosity for water-based nanofluids and the development of empirical viscosity models using the response surface method (RSM). The nanofluids that are being considered in this work are silicon dioxide (SiO2)-water and aluminum oxide (Al2O3)-water at a concentration of 0.01, 0.055 and 0.1 vol.%. Experiments were designed and analyzed according to the face-centered central composite design (CCD) in the RSM. ANOVA was used to evaluate the significance of the independent factors, which are the nanoparticle concentration and temperature. Empirical models to predict the dynamic viscosity of both nanofluids at a specific temperature and volume concentration were developed and validated. Excellent fits of the models were demonstrated by their high coefficient of determination, R2 . Results indicate that dynamic viscosity increases with nanoparticle concentration and decreases with temperature. It is also observed that the addition of less or equal than 0.1 vol.% of SiO2 in water would not significantly change the viscosity.