Entropy generation and thermal criticality of generalized Couette hydromagnetic flow of two-step exothermic chemical reaction in a channel

The study examines thermal criticality and entropy generation of a transient two-step chemical reactive generalized Couette flow for a hydrodynamic fluid in a horizontal heat isothermal wall with viscous dissipation. The reactive fluid is completely exothermic under the effect of various pre-exponential chemical kinetics namely: Sensitized, Arrhenius and Bimolecular kinetics. The flow is influenced by magnetic field and axial constant pressure. Laplace transform method coupled with the differential transform technique is used to obtain the solution to the dimensionless nonlinear governing modelled equations. The impacts of the fluid associated terms on the heat distribution, entropy generation rate and Bejan number as well as thermal criticality for various kinetics are graphically illustrated and discussed. The results revealed that irreversibility process can be encouraged with low dissipation rate, and thermal explosion can be reduced with low heat source terms.