Computational assessment about hydrothermal attributes with induction of MWNT's-Fe3O4 in water saturated in hexagonal enclosure

The prime motive of this case study is to adumbrate elevation in flow and thermal attributes of abundantly used liquid (water) with inclusion of carbon nanotubes and ferrite particles. In view of physical significance of hexagonal enclosure in multiple heat exchange system it is accounted along with provision of fillets at boundaries. Physical impact of horizontal magnetic field is employed along with adjustment of heat circular cylinder. Formulation of problem under the visualization of obliged assumptions and boundary constraints are conceded in dimensionless format. Thermophysical relations are capitalized to explicate explicit behavior of concerned distributions. Solution of modelled problem is accessed through FEM approach. The flow intensity and temperature profiles against physical parameters are sketched through snapshots and tables. Results are drawn in comparative manner to analyze performance of single and muti walled carbon nanotubes. Quantities of interest (mean Nusselt number) is also computed in pictorial and tabular manner versus concerned parameters. It is noticed that the velocity field shows a rising trend in the hydrodynamic case (Ha=0) in comparison to hydromagnetic case (Ha≠0) , as evidenced by the magnitude of the stream function, |ψ|max=0.4 (in the absence of a magnetic field) and |ψ|max=0.01 (in the presence of a magnetic field). It was also observed that the heat transfer rate is more in case of Fe3O4−MWCNT/water hybrid nanofluid instead of Fe3O4−SWCNT/water hybrid nanofluid. Results and code validation tests are also performed to assure credibility of work.