effects of joule heating and viscous dissipation on casson nanofluid flow over a stretched sheet with chemical reaction

Nanofluids find numerous applications in thermal engineering and industrialprocesses due to their effective thermal conductivity property compared toregular fluids. a nanofluid consists of containing nanometer-sized particles,called nanoparticles of metals, oxides, carbides, or carbon nanotubes etc.with water, ethylene glycol, and oil etc. serve as base fluids. the presentstudy takes care of effects of brownian motion and thermophoresis onunsteady casson fluid flow, heat and mass transfer over a stretching sheetembedded in a porous medium. moreover, the flow phenomena aresubjected to heat source, thermal radiation, viscous dissipation, jouleheating and are associated with the diffusion of chemically reactivenanoparticles to base fluid. these two thermo mechanical aspects draw alittle attention of the researchers as reported in literature. the governingequations of flow model admit similarity solution and are reduce to nonlinearordinary differential equations (odes) applying suitable similaritytransformation and are solved numerically using runge-kutta-fehlbergmethod with matlab code. the interesting outcomes are recorded asfollows: the formation of inverted boundary layer, the consequence of flowreversal, is due to overpowering of shearing effect of the rigid boundingsurface over the free stream stretching in the absence of suction. the highermagnetic field intensity as well as unsteady flow parameter leads toincreasing skin friction coefficient may lead to flow reversal. hence,regulating these parameters is a suggesting measure. the low brownianmotion in conjunction with high thermophoresis leads to upsurge of thermalenergy (hike in temperature profile) near the bounding surface. thepresence of nanoparticles considered in the base fluid, deduces the shearingstress at the plate surface is a desired outcome to avoid flow reversal.