COMSOL 6.3 - Porous Matrix (Hygroscopic Porous Medium)

Porous Matrix (Hygroscopic Porous Medium)

This subnode defines the properties of a porous medium filled with two phases: liquid water and moist air. The moisture transport occurs through vapor diffusion and convection in moist air, and convection and capillary flow in the liquid phase.

Porous Matrix Properties

First, set the , εp (a dimensionless number between 0 and 1), that uses by default the value . For the default is 0.

Then, set the , κ (SI unit: m2), to specify the capacity of the porous material to transmit flow. For select to define a scalar value or , , or to define a tensor value and enter another value or expression in the field or matrix.

When a node is defined on the domains where the feature is active, the and the can be set in the section of the node.


	When setting temperature or pressure-dependent properties, the corresponding model inputs are specified in the Hygroscopic Porous Medium parent node. The properties for phase distribution of moisture content in the porous material are specified in the Hygroscopic Porous Medium parent node. The properties for liquid water transport are specified in the Liquid Water (Hygroscopic Porous Medium) subnode. The properties for moist air transport are specified in the Moist Air (Hygroscopic Porous Medium) subnode. When the parent Hygroscopic Porous Medium node is coupled to a Porous Medium node in a fluid flow interface through the Moisture Flow coupling, the porosity and moist air permeability are automatically shared and corrected for the computation of the Darcy velocity of moist air to account for the presence of liquid water.


	The Equilibrium Moisture Transport in Porous Media Interface The Nonequilibrium Moisture Transport in Porous Media Interface The Heat and Moisture Transport Interfaces Heat and Moisture Theory for Moisture Transport in Porous Media


	For a detailed overview of the functionality available in each product, visit https://www.comsol.com/products/specifications/

Location in User Interface

Context Menus