Freezing Project Instructions

##Geometry Changed the value for length in Parameters under Global Definitions to and rebuild the geometry to change the slab thickness. To rebuild the geometry, right click on Geometry 1 under Model and select Build All. Heat Transfer The external temperature, heat transfer coefficient, and initial temperature are also changed in the parameters list. ##Material Properties All material properties are specified in the “freezing_data.dat” data file. Specify the mass fraction and molecular weight of each component to ensure that the functions for heat capacity, density, and thermal conductivity are accurate. In addition, the initial temperature, latent heat of fusion, and freezing point of water must also be specified in order to calculate the mass fraction of ice at each point in the simulation. ##Reaction Parameters The reaction rate constants are specified in the data file. Change the activation energy and k0 value so that they reflect your product. ##Plotting Results Comsol automatically creates temperature and concentration profile graphs for the slab. Change the time for the displayed temperature profile, click on Temperature (or Concentration) in the Results section of the Model Tree and change the time selection to “From List.” Then select the times to display data for.

In order to plot the temperature (or concentration) evolution at a single point, first create a new Cut Point 1D by right clicking on Data Sets and selecting “Cut Point 1D.” Enter the x coordinate of the point whose data is to be plotted. Then create a new 1D plot group by right clicking on results. Set the data set on the new plot group to be the cut point that you created earlier. Finally, right click on the new plot group and make a new point graph. Ensure that the “Expression” field in the point graph is the correct one for the variable you wish to plot (“c” for concentration and “T” for temperature).