Terrific effects of Ohmic-viscous dissipation on Casson nanofluid flow over a vertical thin needle: buoyancy assisting & opposing flow

Blood flow in the arteries is a common example of Casson fluid flow among other novel applications of this fluid model. This model finds application in various transformed delivery system and to design new medical devices for cell delivery to the central nervous system. In this study, the physical perspectives on 2D mixed convection flow of magnetized Casson nanofluid over a vertical moving thin needle in the presence of non-linear thermal radiation and heat source/sink effects has been investigated. The astonishing aspects of buoyancy assisting and opposing flow has also be analyzed in this achievement. The Buongiorno fluid model is employed for the impact of nanoparticles. Further, the Joule heating and viscous dissipation terms are incorporated in the energy equation. The Prandtl boundary layer governing equations are enclosed and solved numerically by utilizing Runge–Kutta Fehlberg 5th order (RKF-5) method. The infiltration of diverse material parameters for instance: Brownian motion, thermophoresis diffusion, thermal radiation, mixed convection, Eckert number, needle thickness and chemical reaction on velocity, temperature, concentration, friction factor and heat flux are exemplified qualitatively via graphical approach. Dual (first and second) solutions are examined within a particular range of needle thickness. Output demonstrate that reduction in needle thickness widen the range of dual solutions. It is found that the friction factor and heat transfer rates increases with the expansion of needle thickness. To the best of our knowledge, the problem provide a novel investigate direction and no such articles reported yet in the literature.