The　present　research　performed　a　numerical　simulation　of　laminar　forced　convection　nanofluid-based　non-Newtonian　flow　in　a　channel　connecting　a　tank　with　heating　regions.　To　achieve　a　rapid　diffusion　of　heat,　a　cylindrical　agitator　is　inserted　into　the　tank.　Power-law　modelling　is　employed　to　describe　the　effect　of　non-Newtonian　behaviour.　The　velocity　and　temperature　fields　and　heat　transfer　coefficient　ratio　are　studied　systematically,　taking　into　account　the　impact　of　various　parameters,　such　as　the　generalised　Reynolds　number　Re,　generalised　Prandtl　number　Pr,　angular　velocity　of　a　cylinder　omega,　nanoparticle　volume　fraction　phi,　mixer　size　and　location.　Our　research　reveals　that,　to　improve　the　heat　transfer　in　practice,　several　applicable　strategies　are　available,　including　the　addition　of　more　nanoparticles　into　the　base　fluid,　which　proved　to　be　the　most　efficient　method　to　enhance　the　heat　transfer　of　a　nanofluid.