Porous Medium offers different ways of specifying the flow resistance, including calculation of the resistance from the channels and pores dimensions. The heat exchange is defined in terms of porous matrix properties.
Porous Medium can be defined in Engineering Database by providing different parameters such as Porosity, Permeability type, Resistance Calculation Formula, Pore Size etc.,
Porous Medium definition from SW Flow Simulation
Porosity:
The ratio of the volume of the interconnected pores to the total volume.
Permeability type:
Defines the permeability of the medium with respect to the flow direction. Four types of permeability are available in SOLIDWORKS Flow Simulation.
Resistance Calculation Formula:
It is used to calculate the flow resistance of the porous medium. The flow resistance coefficient is calculated by
Where P, ρ, V are Fluid Pressure, density, and velocity respectively.
User can specify the k vector components from one on the following equations.
The following formulae are used to specify the resistance of long narrow channel porous medium. This medium along with Unidirectional permeability type allows the user to simulate fluid flow through the arrays of tightly packed parallel thin tubes with high length – to- diameter ratio.
Volumetric Heat Exchange Co-efficient is calculated by
h: Heat Exchange Co-efficient between porous body’s inner surface and the fluid,
EXAMPLE:
Let’s see an example using the same concept in a Catalytic Converter to observe the flow patterns.
From the above image, we have defined two porous media in a catalytic converter. The first one (From right), a Unidirectional medium and the other, an Isotropic medium. The following image will show the flow pattern in each medium.
For the application of the catalytic converter, both the Unidirectional and Isotropic porous medium have their advantages.
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