Numerical simulation of nanofluid flow in a annular porous channel with using the Darcy-Brinkman-Forcheimer model and two-phase mixed model

In this paper, the heat transfer of the forced convection of nanofluid in a annular porous channel on internal and external walls is numerically investigated. The nanofluid is simulated using the dual phase and flow model in the porous region by the Darcy-Brinkman-Forcheimer model. The fluid flow is considered as two-dimensional, laminar, steady, axi-symmetric axial and incompressible. The porous medium is uniform and homogeneous, and the physical properties of the nanofluid and the porous medium are assumed constant. The governing equations have been solved using the finite volume method and SIMPLE algorithm. The effect of parameters such as Darcy number, porosity barrier height and thickness, thermal conductivity of porous region to fluid and volume fraction of nanoparticles on flow field, heat transfer and pressure drop have been investigated. The results show that the use of porous barriers in the flow path leads to significant changes in the characteristics of flow and heat transfer. Reducing the Darcy and Reynolds numbers leads to the formation of a vortex behind the barriers that have a significant impact on heat transfer. By reducing the Darcy number, the heat transfer increases significantly. It will also cause a severe pressure drop in the flow. Increasing the thermal conductivity ratio of the solid-liquid matrix will increase the local Nasslet number of the wall in the area of the barrier, which will be more significant in the high permeability. Increasing the height of the porous barriers reducing the thickness of the boundary layer and increasing the heat transfer.