This node should be used to model heat transfer by convection and diffusion in moist air, using moisture-dependent thermodynamics properties. It solves Equation 6-5, with density
ρ (SI unit: kg/m
3), heat capacity at constant pressure
Cp (SI unit: J/(kg·K)), and thermal conductivity
k (SI unit: W/(m·K)) defined as a function of the amount of vapor in moist air.
This section is available when material properties are temperature-dependent. By default, the temperature of the parent interface is used and the section is not editable. To edit the Temperature field, click
Make All Model Inputs Editable (
). The available options are
User defined (default),
Common model input (the
minput.T variable, set to 293.15 K by default) and all temperature variables from the physics interfaces included in the model. To edit the
minput.T variable, click the
Go to Source button (
), and in the
Default Model Inputs node under
Global Definitions, set a value for the
Temperature in the
Expression for remaining selection section.
The default Absolute pressure pA is taken from
Common model input. It corresponds to the
minput.pA variable, set to 1 atm by default. To edit it, click the
Go to Source button (
), and in the
Default Model Inputs node under
Global Definitions, set a value for the
Pressure in the
Expression for remaining selection section. When additional physics interfaces are added to the model, the absolute pressure variables defined by these physics interfaces can also be selected from the list. For example, if a
Laminar Flow interface is added you can select
Absolute pressure (spf) from the list. The last option is
User defined.
In the Concentration c (SI unit: mol/m
3 or kg/m
3) list, select an existing concentration variable from another physics interface, if there are concentration variables,
User defined to enter a value or expression for the concentration, or
Common model input that corresponds to the
minput.c variable.
The default Velocity field u is
User defined. For
User defined enter values or expressions for the components based on space dimensions. Or select an existing velocity field in the component (for example,
Velocity field (spf) from a
Laminar Flow interface). The
Common model input option corresponds to the
minput.u variable. To edit it, click the
Go to Source button (
), and in the
Default Model Inputs node under
Global Definitions, set values for the
Velocity components in the
Expression for remaining selection section.
The Input quantity options available to define the amount of vapor in moist air are as follows:
Depending on the selected Input quantity, enter values or expressions for the
User defined option, select an ambient value (for example, an
Ambient relative humidity defined in an
Ambient Properties node under
Definitions), or select a value from a Moisture Transport interface.