Significance of solvent percentage and external pollutant source concentration in Boger-micropolar fluid flow across a semi-circular body

The current investigation explores the influence of the magnetic field on the Boger micropolar liquid motion over a curved stretchable sheet. Further, the mass and heat transportation attributes are analyzed with the significance of heat source/sink, nonlinear thermal radiation, and pollutant concentration. Micropolar liquids are more complicated than Newtonian liquids and represent real-world materials such as polymers and biological liquids. Understanding how contaminants alter these fluids' microstructure and flow behaviour is critical for medical care, biology, and materials research uses. The governing partial differential equations (PDEs) are converted to dimensionless ordinary differential equations (ODEs) using similarity variables. Furthermore, the obtained ODEs are solved using the Runge Kutta Fehlberg’s fourth-fifth order (RKF-45) approach. Moreover, the effects of several dimensionless parameters on the various profiles are depicted in graphs. The increase in the material parameter and relaxation time ratio decreases the velocity profile. As the values of thermal radiation and heat sink/source parameters increase, the temperature profile intensifies. The increase in values of the pollutant external source parameter increases the concentration profile. As the Schmidt number values increase, the concentration profile reduces.