Liquid Water (Hygroscopic Porous Medium)
This subnode defines the properties for the transport of the liquid water phase in a porous medium filled with two phases in equilibrium: 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.
Liquid Water Properties
This section contains the settings for the definition of convective transport of liquid water. See Hygroscopic Porous Medium for the definition of capillary transport.
The convective flux of liquid water is always computed with Darcy’s law. Set the Relative liquid water permeability, κrl (dimensionless), that multiplies the porous medium permeability in the Darcy’s law to account for the saturation of the liquid phase.
The liquid water properties are based on the temperature set in the corresponding model input in the Hygroscopic Porous Medium parent node.
The capillary transport and storage properties can be specified in the Hygroscopic Porous Medium parent node.
The liquid saturation, sl, is defined from the moisture storage function specified in the Hygroscopic Porous Medium parent node.
The moist air properties can be specified in the Moist Air (Hygroscopic Porous Medium) subnode.
The solid matrix porosity and permeability can be specified in the Porous Matrix (Hygroscopic Porous Medium) subnode.
The 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
Moisture Transport in Air>Hygroscopic Porous Medium>Liquid Water
Moisture Transport in Building Materials>Hygroscopic Porous Medium>Liquid Water
Moisture Transport in Porous Media>Hygroscopic Porous Medium>Liquid Water