Step 5: Specify Material Properties
We are solving the energy and the species equation and so we need to provide the solver with the appropriate material property values required for the analysis. These properties are:
(i) Density (r): The density of the material of the slab is 900 kgm-3
(ii) Thermal Conductivity (k): The thermal conductivity is 0.55 W (Mk)-1
(iii) Specific Heat (cp): The specific heat is 3800 J (kgK)-1
(iv) Diffusivity (D): The diffusivity of bacteria is 1e-7 m2/s
1) In the Material Properties window, select Cylinder under Zones
2) Click on the text field next to Density and type 900
3) Click on the text field next to Th. Conductivity and type 0.55
4) Click on the text field next to Specific Heat and type 3800
5) Click on the text field next to Species 1 Diffusivity and type 1E-7
6) Click on Apply
7) Click on Boundary Conditions. We will now specify the boundary conditions required to solve the problem.
Step 6: Specify Boundary Conditions and Initial Condition
The boundary conditions for the heat transfer problem are:
On the bottom boundary (Axis): Heat Flux =0 due to symmetry
On the top boundary (Side): Convection B.C with Heat Transfer Coefficient = 40 W/m2K and Tref = 1210C
On the left boundary (Middle): Heat Flux =0 due to symmetry
On the right boundary (End): Convection B.C with Heat Transfer Coefficient = 40 W/m2K and Tref = 1210C
For the species equation, all the boundaries are considered to be insulated. Therefore, Species Flux =0 on all 4 boundaries.
We now specify these boundary conditions to the solver. We do not need to specify the boundary condition on the axis as these are taken to be zero flux boundaries by default by the solver.
Specify BC on the Top Boundary
1) In the Boundary Conditions window, select SIDE in the Entity field.
2) Click on the Spec1 Conc button and select Spec1 Flux from the drop-down list
3) Select Constant from the drop-down menu next to the Spec1 Flux text-box
4) In the Spec1 Flux text field, Type 0
See rest of steps below:
5) Select Constant from the drop-down menu next to the Heat Trans Coeff text-box
6) In the Heat Trans Coeff text field, Type 40
7) Select Constant from the drop-down menu next to the Ref Temperature text-box
8) In the Ref Temperature text field, Type 121
9) Click on Apply
Specify BC on the Left Boundary
1) In the Boundary Conditions window, select MIDDLE in the Entity field.
2) Click on the Temperature button and select Heat Flux from the drop-down list
3) Select Constant from the drop-down menu next to the Heat Flux text-box
4) In the Heat Flux text field, Type 0
See rest of steps below:
5) Click on the Spec1 Conc button and select Spec1 Flux from the drop-down list
6) Select Constant from the drop-down menu next to the Spec1 Flux text-box
7) In the Spec1 Flux text field, Type 0
8) Click on Apply
Specify BC on the Right Boundary
1) In the Boundary Conditions window, select END in the Entity field.
2) Click on the Spec1 Conc button and select Spec1 Flux from the drop-down list
3) Select Constant from the drop-down menu next to the Spec1 Flux text-box
4) In the Spec1 Flux text field, Type 0
5) Select Constant from the drop-down menu next to the Heat Trans Coeff text-box
See rest of steps below:
6) In the Heat Trans Coeff text field, Type 40
7) Select Constant from the drop-down menu next to the Ref Temperature text-box
8) In the Ref Temperature text field, Type 121
9) Click on Apply
10) Click on Initial Conditions. We will now supply the initial conditions to the solver.
http://www.cadfamily.com/html/Article/FIDAP-Thermal%20Sterilization%20Part%20B_587_1.htm
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