Double diffusion in stretched flow over a stretching cylinder with activation energy and entropy generation

Present study accords exploration of double diffusion in an axisymmetric flow of chemically reacting viscous fluid which impulsively starts flowing over a cylinder due to stretched surface. Non-Fourier law is employed to explain the heat flow whereas non-Fick's law of mass flux is employed to delve into the diffusion of mass. Activation energy is also taken into account. Transformed governing equations are solved using efficient mathematical technique called Homotopy Analysis Method (HAM). For the validity of the solution technique convergence table and h curves are plotted. Numerical solution has also been computed by using Shooting method for comparison with HAM. Entropy generation of the system has been investigated. Significant impact of pertinent flow parameters on thermal profile, concentration and velocity distribution are examined graphically. Velocity and thickness of momentum boundary layer increase by increasing curvature. Thermal profile is inversely related with Prandtl number and thermal relaxation time. Concentration profile trickles down by an increase in Schmidt number, mass relaxation parameter, Fitted rate constant and temperature ratio parameter. Most of the studies available in the literature focused on the double diffusion using generalized Fourier and Fick's laws neglecting activation energy and entropy generation which is an inevitable aspect in practical problems now a days. These features have been considered in the present article and it is the novelty of the present research.