Heat Transfer in Porous Media
In the Model Builder window, under Component 1 (comp1) click Heat Transfer in Porous Media (ht).
Solid 1
1
In the Physics toolbar, click  Domains and choose Solid.
2
In the Settings window for Solid, locate the Domain Selection section.
3
From the Selection list, choose Solid Copper Tube Casing.
Fluid 1
1
In the Physics toolbar, click  Domains and choose Fluid.
2
In the Settings window for Fluid, locate the Domain Selection section.
3
From the Selection list, choose Vapor Cavity.
Porous Matrix 1
Use copper as the solid phase in the porous material. Because the material contains properties for the dense bulk material, you need to specify that the material properties are bulk properties, and therefore need to be scaled by the porosity.
1
In the Model Builder window, under Porous Medium 1, click Porous Matrix 1.
2
Locate the Matrix Properties section. From the Define list, choose Solid phase properties.
Next specify the boundary condition corresponding to the heat source.
Heat Flux 1
1
In the Physics toolbar, click  Boundaries and choose Heat Flux.
2
In the Settings window for Heat Flux, locate the Boundary Selection section.
3
From the Selection list, choose Heat Source.
4
Locate the Heat Flux section. In the q0 text field, type phi_in.
Heat Flux 2
The boundary condition for the heat sink is set up analogously, but with a convective heat-flux condition. That is, the heat flux out of the pipe through the heat sink is proportional to the temperature difference between the heat sink and the external environment. The magnitude of this proportionality constant (the heat transfer coefficient) depends on external flow conditions such as the presence of an external fan, the external surface area, and the geometry of fins (if present).
1
In the Physics toolbar, click  Boundaries and choose Heat Flux.
2
In the Settings window for Heat Flux, locate the Boundary Selection section.
3
From the Selection list, choose Heat Sink.
4
Locate the Heat Flux section. Choose Convective heat flux from the choices of Flux type.
5
In the h text field, type h_conv.
Boundary Heat Source 1
The heat associated with the phase change of water, removes heat at the hot side (evaporation) and contributes heat at the cold side (condensation), the amount of energy involved is the heat of vaporization. Add a boundary heat source at the cavity/wick interface for this process.
1
In the Physics toolbar, click  Boundaries and choose Boundary Heat Source.
2
In the Settings window for Boundary Heat Source, locate the Boundary Selection section.
3
From the Selection list, choose Inner Wick Boundary.
4
Locate the Boundary Heat Source section. In the Qb text field, type (u*spf.nr+w*spf.nz)*HeatOfVaporization_water21(T)*spf.rho.