Inflow

Use this node to model inflow of water vapor through a virtual domain, at inlet boundaries of moist air and hygroscopic porous medium domains. The upstream moisture conditions (either vapor concentration custr, or vapor mass fraction ωustr, or relative humidity

and temperature Tustr) are known at the outer boundary of the virtual domain. The inflow condition is often similar to a moisture content condition. However using this condition the upstream vapor concentration is not strictly enforced at the inlet. The higher the flow rate, the smallest difference between the inlet and upstream moisture content. In case of moisture sources or moisture constraints close to the inlet boundary, the inflow condition induces a moisture profile that approaches to the moisture profile that would be obtained by computing the solution in the virtual domain upstream the inlet.

If both inflow and outflow conditions are expected at some boundaries, use the Open Boundary feature instead.

When the option is selected in the list, this boundary condition estimates the moisture flux through the inlet boundary from a Danckwerts condition on the vapor concentration:

When the option is selected in the list, this condition is rewritten as:

to be expressed in function of the vapor mass fraction ωv, with

Note that on the exterior boundaries of a porous medium, the Danckwerts condition is always based on the vapor mass fraction, because the concentrated species formulation is always used for the moist air phase.

This node can be applied on the exterior boundaries of a computational domain in which either a Moist Air (Moisture Transport Interface) node or an Hygroscopic Porous Medium node is active.

When is set to in the list, set both the Tustr and the

from which the upstream vapor concentration and the vapor mass fraction can be defined:

For , enter values or expressions. Else, select any available input (like defined in an node under ).

Alternatively, choose in the list, and set directly a value or expression for the custr.

Finally, choose in the list to set a value or expression for the ωustr.

	Evaporative Cooling of Water: Application Library path Heat_Transfer_Module/Phase_Change/evaporative_cooling

Physics Tab with interface as , , or selected: