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The effect of porous materials with equilibrium and non-equilibrium properties with thermal source, CFD simulation using ANSYS Fluent

Study of fluid flow in porous media is one of the most widely used fields in science. Perhaps the most tangible example of a porous media is a porous environment of various tissues in the body. Skin, bone, kidney and lung can be considered porous medium. The main subjects of geology, soil science, water engineering, oil and gas reservoir engineering are also the study of different transmission phenomena in porous environments. These environments also have widespread applications in a wide variety of industries, such as food, wood, textiles, building materials, insulators, filters and membranes.

A porous medium consists of a kind of material, the volume of which consists of pores and stomata. In some applications of fluid dynamics, we need to investigate the flow of fluid in porous media. This occurs in places where a fluid moves through the pores in the material.

In this analysis, we tried to simulate and analyze the effect of porous materials on the heat transfer from a thermal source in a cooling heat sink by ANSYS Fluent software.

Geometry and grid

The geometry required for this analysis consists of a hollow chamber that at its very end consists of a region containing porous material and there is a thermal source below this area. This geometry is designed in ANSYS Design Modeler software and the required meshing is also produced by ANSYS Meshing software for this geometry. The generated grid for this geometry is structured and the total number of cells created for this geometry is 87,000.

Model

Regarding the low Reynolds number in this Heat Sink, a LAMINAR viscosity model was used to analyze the flow turbulence. Energy equations are solved together with the momentum equations. Gravity is also considered in this analysis.

Boundary Condition

The flow input is defined as Velocity Inlet and is set to 4.421952 m/s at a temperature of 300 K. The flow output is also considered as a Pressure Outlet at 300K. In order to reduce the computational time and also because of the symmetry in the geometry, in this analysis, only half of the domain has been modeled and therefore the Symmetry boundary condition has been used.

Discretization of equations

The SIMPLE algorithm is used to solve the equations in this analysis. Pressure-Based solver for flow is also used. The Second Order Upwind method is used to discretize equations.

At the end, the results are shown as the velocity and the temperature contours.

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