In this paper, we present a theoretical study of the combined effects of activation energy and binary chemical reaction in an unsteady mixed convective flow over a boundary of infinite length. The current study incorporates the influence of the Brownian motion, thermophoresis and viscous dissipation on the velocity of the fluid, temperature of the fluid and concentration of chemical species. The equations are solved numerically to a high degree of accuracy using the spectral quasilinearization method. Brownian motion was noted as the main process by which the mass is transported out of the boundary layer. The effect of thermophoretic parameter seems to be contrary to the expected norm. We expect the thermophoretic force to ‘push’ the mass away from the surface thereby reducing the concentration in the boundary layer, however, concentration of chemical species is seen to increase in the boundary layer with an increase in the thermophoretic parameter. The use of a heated plate of infinite length increased the concentration of chemical species in the boundary layer. The Biot number which increases and exceeds a value of one for large heated solids immersed in fluids increases the concentration of chemical species for its increasing values.

In this paper, we investigate the boundary layer flow of a steady viscous nanofluid with activation energy and a high order chemical reaction. The flow equations are solved to a high degree of accuracy using the spectral quasi-linearization method with residual errors less than ${10}^{-08}$. The changes in the local skin friction coefficient, local Nusselt number and local Sherwood number with flow parameters are analyzed. Both the activation energy and order of the chemical reaction are shown to enhance the momentum and solute boundary layers while decreasing the thermal boundary layer. Increasing the activation energy and the order of the chemical reaction reduces the Bejan number, indicating that viscous dissipation and mass transfer-induced entropy dominate irreversibility of the heat transfer. The impact of particle Brownian motion and thermophoresis are also discussed in detail. Heat generation is shown to increase heat transfer irreversibility as evidenced by an increase in the Bejan number when the parameter is increased.

The silicon material has provoked and stimulated significant research concern to a considerable extent taking into account its marvelous mechanical, optical, and electronic properties. Naturally, silicons are semiconductors and are utilized in the formation of various materials. For example, it is used in assembling the electronic based gadgets. In this article, we have studied the 2D structure of silicon carbide Si₂C₃ − I[m, n] and Si₂C₃ − II[m, n] and then continued to discuss some degree grounded topological descriptors in association with their corresponding entropy measures. We extend this computation to the quantitative and pictorial comparisons which could be beneficial in the structure amendment for effective implementation.