G. Reza Vakili-Nezhaad

By Ibrahim Ashour, Nabeel Al-Rawahi, Amin Fatemi and Gholamreza Vakili-Nezhaad

Part of the book: Thermodynamics

By Nabeel Al-Rawahi, Gholamreza Vakili-Nezhaad, Ibrahim Ashour, Amin Fatemi

Part of the book: Advances in Modeling of Fluid Dynamics

By Majid Al-Wadhahi, G. Reza Vakili-Nezhaad and Ohoud Al Ghafri

This study focused on measuring the viscosity and analyzing the behavior of two types of nanofluids: ferrous oxide-deionized (DI) water nanofluids and graphene-DI water nanofluids at different temperatures and volume fractions. Zeta potential measurement, which was performed to check the stability of the nanofluids, showed stable suspensions. All viscosity measurements were conducted using a capillary viscometer at temperatures ranging between 25 and 65°C. Both types of nanofluids showed increasing viscosity with increasing nanoparticle loading and decreasing viscosity with increasing temperature. Furthermore, experiments on different-sized ferrous oxide-based nanofluids revealed inverse relation between the size of nanoparticles and viscosity. An accurate model was developed based on the Buckingham Pi theorem to fit all factors affecting viscosity in a dimensionless form. These factors are the viscosity of the base fluid, nanoparticles’ volume fraction, nanoparticles’ size, the temperature of the system, some molecular properties, and zeta potential.

Part of the book: Thermophysical Properties of Complex Materials