Heat Transfer in Solids and Fluids (ht)
Continue with setting up the heat transfer interface.
Fluid 1
1
In the Model Builder window, under Component 1 > Heat Transfer in Solids and Fluids click Fluid 1. These are the free flow domains.
2
Select Domains 1 and 3 only.
Initial Values 1
1
In the Model Builder window, click Initial Values 1.
2
In the Settings window locate the Initial Values section.
3
In the T text field, type T0. This is a parameter that you defined in the beginning.
Porous Medium 1
1
In the Physics toolbar, click Domains  and choose Porous Medium .
2
Select Domain 2 only.
3
In the Settings window for Porous Medium, locate the Porous Medium section.
4
From the Porous medium type list, choose Local thermal nonequilibrium.
5
Choose Spherical pellets from the Interstitial convective heat transfer coefficient list.
6
In the dpe text field, type dp.
For a porous medium which is not in thermal equilibrium the initial temperatures for each component of the porous medium need to be specified. By default, the fluid phase temperature field is considered to be continuous with the surrounding domains and the solid phase temperature field is considered to be insulated from the surrounding domains.
Initial Values 1
1
Expand the Heat Transfer in Solids and Fluids > Porous Medium 1 > Fluid 1 node, then click Initial Values 1.
2
In the Settings window for Initial Values, locate the Initial Values section and type T0 in the T text field.
Porous Matrix 1
1
In the Model Builder window, under Heat Transfer in Solids and Fluids > Porous Medium 1 click Porous Matrix 1.
2
In the Settings locate the Matrix Properties section.
3
From the Define list, choose Solid phase properties.
Initial Values 1
1
Expand the Porous Matrix 1 node, then click Initial Values 1.
2
In the Settings window locate the Initial Values section and type T0 in the T text field.
Phase Change Material 1
1
In the Model Builder window, click Porous Matrix 1.
2
In the Physics toolbar, click Attributes and choose Phase Change Material .
In this solid-solid phase change process, the density is assumed to remain constant which is a reasonable simplification. The mean density value of liquid and solid paraffin is used, which is calculated in the parameter list.
3
In the Settings window locate the Phase Change section and enter:
-
In the Tpc,1 → 2 text field, type 60[degC].
-
In the ΔT1 → 2 text field, type 2[K].
-
In the L1 → 2 text field, type 213[kJ/kg].
4
Locate the Phase 1 section. From the Material, phase 1 list, choose Paraffin, solid (mat2) and from the Material, phase 2 list, choose Paraffin, liquid (mat3).