Abstract
Multi Wall Carbon Nano-Tubes (MWCNT's) are new types of nanoparticles which enhance thermal behavior of the base fluids. These are applicable in automotive engineering. Besides, Micro-polar Nano-fluids are another type of Nano-fluid in which the micro-rotation of the nanoparticles is considered when solving the governing equations. In this study, the natural convection and entropy generation of a Micro-polar MWCNT-Fe3O4/Water Hybrid Nano-fluid is investigated. The governing equations which consider the Non-Newtonian behavior of this type of Nano-fluid are solved by FEM. The effcacy of micro-rotation parameter (0-2), Hartmann number (0-20), Rayleigh number (10(4)-10(6)), and inclination angle of the cavity (0 degrees-90 degrees) on the Nusselt number and S is investigated. The findings disclose that both micro-rotation parameter and Hartmann number reduce NC and Nu(avg) of hybrid nanofluid. Besides, Be number will increase by reducing Ra number. Moreover, the average of Be number will enhance up to 19% and the Nu avg will be weakened by 24% by changing the phi from 0 degrees to 90 degrees. Plus, Nu(avg) will descend by 27% when the micro-rotation parameter is increased from 0 to 2. This study is mostly applicable in solar collectors, heat exchangers, and biomedical engineering such as blood flow in which the micro-polar flow is present.