Dissipative Unsteady MHD Flow of Casson Fluid in Horizontal Channels: Influence of Radiation, Chemical Reaction, Joule Heating, and Velocity Slip

In the computational fluid dynamics field, the study of fluid flow coupled with chemical reactions has garnered significant attention due to its practical implications across various industrial domains. This research is particularly critical in applications like nuclear reactors; understanding the flow behavior and its interaction with chemical processes is essential for system design and optimization. Motivated by this study, we investigate the influence of chemical reactions on MHD extracting flow of Casson fluid amongst a penetrable medium below the slip state, incorporating the effects of emission, viscous dissipation, and radiation. The flow is produced by the compression of two plates moving toward each other, causing the formation of a thin liquid layer between them. By changing the ruling PDEs into ODEs, the similarity transformation technique is used to make them amenable to numerical solution. The FDM method is applied to solve the resulting ODEs, with a particular focus on the dominant parameters that influence the flow dynamics, temperature, concentration, and mass transfer rates in this system. Numerical results show that as the gap between the plates increases, both the velocity and wall tangential shear increase. The influence of the Hartmann and Casson parameters is also significant; these parameters lead to a reduction in the velocity, temperature, along with the concentration of the gas. Furthermore, the effect of viscous dissipation is found to enhance both the temperature and heat transfer rate. Regarding chemical reactions, the study reveals that the rate of mass transfer increases under ruin synthetic reactions but decreases during constructive reactions, highlighting the crucial role of reaction type in controlling the overall performance of the system.