Double-diffusive convective entropy generation in rheological nanomaterial with non-Fourier Cattaneo-Christov fluxes for thermal energy storage systems

Nanoparticles dispersed in conventional material result in nanoliquid which serve as working substances in various energy storage systems particularly in thermal energy storage devices including solar power plants, heat exchangers, automobile radiators, photovoltaic cells, nuclear reactors, boilers and heat pipes etc. Recent researchers have keen interest in efficient cheap heat storage technology. Such technology has special relevance for electrical, solar and power energy and waste heat recovery. Besides these some prominent applications of entropy generation are light emitting diode (LED), thin film technology, internal combustion engines, lubrication, extrusion process, heat pump, air conditioning, solar energy, steam turbine, energy dissipation and many others. Through such facts in mind the objective here is to consider Cattaneo-Christov fluxes in for entropy optimized hydromagnetic flow of rheological (Walter-B) nanomaterial. Energy expression for reactive flow with Brownian motion, Joule heating and thermophoresis is correctly modeled. Brownian movement, radiation, thermophoresis and Ohmic heating is under consideration. Analysis is carried out in presence of first order reaction and Soret effects. Entropy generation for flow with radiation and Joule heating is first time correctly modeled in presence of Cattaneo-Christov theory. In fact, additional terms due to Cattaneo-Christov flux for radiation and Joule heating in entropy rate were missed. Related nonlinear expressions are converted into non-dimensional ordinary systems through suitable variables. Convergence solutions have been developed through Optimal homotopy analysis method (OHAM). Solutions convergence by individual and total residual errors is examined. Graphical results illustrating the impact of emerging parameters for entropy rate, flow, temperature and concentration are arranged. Performance for sundry variables on quantities under interest are examined. It is witnessed that Nusselt number and temperature have similar effects through Hartmann number. Reverse impact for entropy rate and liquid flow against Hartmann number is noticed. An increment in thermal relaxation time leads to amplify thermal field. An intensification in surface drag force coefficient through viscoelastic variable is noticed whereas an opposite impact holds for velocity.