Module Chemical Reaction Engineering
New App: Membrane Dialysis
Dialysis is a widely used chemical species separation method. One such example is hemodialysis, which acts as artificial kidneys for people with renal failure. In dialysis, only specific components are allowed to diffuse through the membrane, based on differences in molecular size and solubility.
The Membrane Dialysis app simulates a process for lowering contaminant concentration in a fluid. The device consists of a hollow fiber module, where the walls of the hollow fibers act as a membrane for removing the contaminant.
Results from this app can aid in selecting membrane materials, dimensions of the fibers, and operating conditions.
New App: Liquid Chromatography
High-performance liquid chromatography (HPLC) is a common method of separating, identifying, and quantifying each chemical compound in a mixture. HPLC is found in the pharmaceutical, biotech, and food industries.
The Liquid Chromatography app simulates the separation of two species within a generic liquid chromatography column.
Simulations can help pinpoint design elements of chromatography columns and component separation details. This includes the length and porosity of the column and the specific conditions of the two components, including their Langmuir isotherm. All of this can be changed within the app.
Editable Species Reaction Rates in Species Nodes
With COMSOL Multiphysics version 5.2, you can easily change the individual reaction rate of a species directly in the Species node of the Reaction Engineering interface. The entered expression overrides the rate definition set up by the Reaction feature, which follows the mass action law by default. In previous versions of the software, you edited species reaction rates in the equation view, which could require additional sources for compensation.
New Catalytic Particle Shapes in Reactive Pellet Beds
In the Reactive Pellet Bed feature, you can now specify nonspherical catalytic pellet shapes. In addition to spheres, new options include cylinder shapes, flakes, and user-defined pellet shapes.
Improved Import of Experimental Data for Parameter Estimation
The Experiment feature of the Reaction Engineering interface can now convert the unit of the imported data used for parameter estimation. Use the Weight option to control the importance of each data type during optimization.
Improved Equilibrium Reaction Functionality
For equilibrium reactions in the Reaction Engineering interface, a Suppress negative concentrations check box has been introduced to aid the solution of equilibrium systems. Selecting the check box ensures that no negative values of concentrations are accepted as solutions to the equilibrium condition.
Molar and Millimolar Concentration Units
Molar (M (moles/l)) and millimolar (mM (mmoles/l)) have been added as units to specify concentration, in addition to the SI unit moles/m3.
New Tutorial: Fermentation in Beer Brewing
During the beer fermentation process, alcohol and various flavors are formed together when sugars are transformed by yeast.
In this tutorial, the fermentation process is first modeled in a perfectly mixed tank with the Reaction Engineering interface. In the next step, a space-dependent detailed tank model is simulated, accounting for mass transfer, heat transfer, and natural convection.
You can study the impact of initial sugar content, temperature, and yeast type on the fermentation process.