Study of heat transfer in water-Cu nanofluid saturated porous medium through two entrapped trapezoidal cavities under the influence of magnetic field

It has been noticed that the stream line circulations gets stronger in the enclosure with increase in Rayleigh number and it appears more significantly in lower enclosure in comparison to top enclosure. Whereas isotherms are observed to be broken and distorted for large Rayleigh numbers showing the convection dominant effects in the enclosure. Isotherms deform largely for large value of Darcy number and strength of streamline circulations is noted to increase with increase in Darcy number. Furthermore, local Nusselt numbers for horizontal walls are seen to be maximum at edges and decreases while moving towards center of the side from corners. Average Nusselt numbers are noted to be increasing function of porosity parameter however it increases along bottom wall and decreases along top wall with increase in Darcy number.