Study of magneto-hydrodynamics (MHD) impacts on an axisymmetric Casson nanofluid flow and heat transfer over unsteady radially stretching sheet

The current study is presented to probe the impacts of thermal radiation and mixed convection of axisymmetric Casson fluid flow in the presence of magnetic field along with nano-particles. The flow is provoked because of unsteady radially stretching sheet. The solution of transformed ordinary differential equations is attained by utilizing Keller-box finite difference method (IFDM). The influence of different parameters on flow features is sketched through various graphs and results are tabulated and argued briefly. The convection conditions on the wall temperature and concentration are also exerted in the study. Finally, a comparison is established with existing literature to support our results and a good agreement is found which corroborates our work. A decline in both velocity and temperature is witnessed with the rise in Casson parameter. It is also observed that with the rise Brownian motion and Thermophoresis parameters, the temperature of the fluid rises but concentration profile decreases in start and then start increasing. The fluid concentration in its boundary layer decreases with the increase of heavier species, the parameter of the reaction rate and the exponent of power law for fluid having Prandtl number = 10.0, 15.0, and 20.0. Moreover, the fluid velocity depreciates with the rise in unsteadiness parameter while a significant decrease in temperature is noted. The outcomes of study are quite useful in fabrication of magnetic nano-materials and high temperature treatment of magnetic nano-polymers.