Hydrothermal analysis of Ag and CuO hybrid NPs suspended in mixture of water 20%+EG 80% between two concentric cylinders

Abstract

This paper investigates the mixture of hybrid nanofluid (NF) flow between two concentric cylinders numerically. Ethylene glycol (80%) and water (20%) comprise the base fluid. Additionally, copper oxide (CuO) and silver (Ag) NPs are added. The hybrid NF flows between the two coaxial cylinders is studied. The inner cylinder is fixed and the outer cylinder is rotating. A radial magnetic field also affects fluid flow, and joule heating joule heating is also considered. The transformed system of nonlinear ordinary differential equations is solved numerically using the fifth-order Runge-Kutta method. Numerical solutions are obtained for fluid velocity and velocity gradient, fluid temperature and temperature gradient, pressure, surface friction coefficient and Nusselt number under the influence of different variables. The computer code is validated by comparing the variation of temperature of hybrid nanofluid with the numerical published data, a good agreement was observed. As the magnetic field parameter is increased, the fluid's velocity reduces. The fluid temperature increases as the magnetic field parameter and Brinkman number were increased. The skin friction coefficient increases with the enhancement of volume percentage and the magnetic field parameter. The Nusselt number rises with increasing of the magnetic field and Brinkman number.