Abstract
Heat and flow characteristics for bioconvection of nanofluid due to a radially stretching and rotating disk are examined. The nanofluid bioconvection is caused by the combined effects of magnetic field and buoyancy force on the interaction of motile gyrotactic microorganisms and nanoparticles in a dilute base fluid. The doping of suspended gyrotactic microorganisms and nanoparticles produces innovative heat transfer enhancement with provision of higher thermal conductivity through stability of nano particles. The motile microorganisms are self-propelled and they can actively swim in the fluid in response to such stimuli as gravity, light or chemical attraction. The computational results for physical quantities of interest due to influential thermophysical parameters and bioconvection parameters have been evaluated by employing bvp4c solver in Matlab. It is observed that the cooling rate becomes faster when radial stretching, Brownian diffusion and thermophoretic diffusion are increased.