del can be measured. After a period of t = 1800 s, the melting ice has the proportions shown below:
Geometry of the melting front after 30 minutes.
You can see from this visualization that the melting front has a concave curved shape that is higher around the outside edges of the vial wall. Additionally, because the heating is uneven at the bottom of the vial, the interface level is slightly lower, near x > 0. As the ice becomes a vapor, the mass of the solid decreases and therefore the mesh of the solid must change as well. The image below shows the moving mesh at the initial time (left), and after 30 minutes (right). As you can see, the swept mesh has changed to follow the receding freezing front.
The moving mesh at initial time (left), and after 30 minutes has passed (right).
- Download the model: A Transient Analysis of Freeze-Drying
- Related paper from the COMSOL Conference 2011: Finite Element Modeling of Freezing of Coffee Solution
Using Gradient-Free Optimization
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