Investigation of hybrid nanofluid SWCNT-MWCNT with the collocation method based on radial basis functions

In this research, non-Newtonian natural convection of hybrid nanofluid comprising single-wall carbon nanotube (SWCNT) and multi-wall carbon nanotube (MWCNT) based on methanol fluid between two infinitely parallel vertical flat plates is investigated. The basic partial differential equations are reduced to ordinary differential equations which are solved using the collocation method based on radial basis functions (RBF). The results obtained using the RBF method and numerical method are in good agreement, demonstrating the RBF method's ability to solve such problems. The hybrid nanofluid has more velocity around the plate with a higher temperature, so it reaches its maximum velocity in eta = -0.5. Also, it approaches the plate with a lower temperature, and its velocity decreases. As the hybrid nanotubes volume fraction increases, the momentum boundary layer thickness and thermal boundary layer thickness decrease. The maximum velocity profile is related to the hybrid nanotubes volume fraction of 0.05, equal to 0.033. Also, the minimum error in this method for the momentum equation is equal to IIRes1||(2) (sic) 10(-45) at N = 30 which shows fast convergence of the proposed method.