Optimizing shear rate in unsteady stagnation point flow of micro‐polar ternary nanofluid flow over a stationary plate: A statistical approach

The tri‐hybrid nanofluids exhibit enhanced thermal characteristics compared to nanofluids and hybrid nanofluids, leading to advancements in nanomaterial engineering. Furthermore, there are several uses for the enhanced thermal properties, including the cooling of electrical devices, industrial processes, and medicinal equipment. This research explores the flow dynamics of magneto‐micropolar tri‐hybrid nanofluids over a static surface, emphasizing their thermal and flow properties under magnetic effect. Additionally, the equations concerning momentum, micro‐rotation, and energy have been restructured into a set of ordinary differential equations (ODEs) using similarity transformation. These ODEs are then solved using the fourth‐order approximation of the Runge‐Kutta method in combination with Newton's iteration approach. Further, the graphical results are shown for three different cases: nanofluid (Ag/Carboxymethylcellulose (CMC)‐Water), hybrid nanofluid (Ag + CuO/CMC‐Water), and tri‐hybrid nanofluid (Ag + CuO + Cubic Boron Nitrate (CBN)/CMC‐Water).Additionally, a novel approach, response surface methodology (RSM), is applied using Central Composite Design (CCD) to establish a correlation between shear rate and the governing parameters of the problem to minimize the shear rate. The important finding shows that as the magnetic parameter increases, the temperature rises sharply, and a cooling effect is observed in the temperature profile. A significant comparative analysis has been performed to confirm the validity of the current results.