Chemical Reaction Engineering Module Updates
For users of the Chemical Reaction Engineering Module, COMSOL Multiphysics® version 5.6 brings new functionality for modeling reacting systems: automatic reaction balancing, predefined thermodynamic systems, and reacting pellets for transport of concentrated species. This new functionality is exemplified in new tutorials in the module's Application Library, which you can use as a starting point for your models. Learn more about these chemical reaction engineering features below.
Automatic Reaction Balancing
Typos and errors in chemical equations involving many reactants and products may be difficult to discover when defining a model. With COMSOL Multiphysics® version 5.6, the Chemical Reaction Engineering Module introduces parsing of chemical elements in order to perform stoichiometric balancing of reactions. The atomic balance ensures that the chemical elements are conserved in a chemical equation. Clicking the Balance button automatically computes the stoichiometric coefficients in order to conserve all elements. In addition, parsing of atomic elements also allows for the automatic computation of the molar masses of the chemical species (compounds).
Predefined Thermodynamic Systems
Dry air, moist air, and water-steam are available as predefined thermodynamic systems for modeling climate control and for chemical reactions that take place in water or air. For modeling CFD, heat transfer, and acoustics applications, these thermodynamic systems can generate the corresponding materials in the Materials node. The different variants of air (dry, moist, steam) automatically define the species: nitrogen, oxygen, water, argon, carbon dioxide, neon, and helium.
Reacting Pellets for Concentrated Solutions
The new Reactive Pellet Bed feature provides a template for modeling transport and reactions in fixed bed reactors with bimodal pore structure. You can model, for example, fixed beds that consist of spherical pellets where the pellets themselves are porous. This yields a system with macropores found between pellets, and micropores inside of the catalyst's pellets. The transport and reactions of concentrated species in the macropores and the micropores are modeled in different coordinate systems and at different scales, but they are all connected._
New Porous Medium Feature
A new feature for handling a porous medium is available for defining the different phases: solids, fluids, and immobile fluids. In the Heat Transfer in Porous Media interface, the Porous Medium feature is used to manage the material structure with a dedicated subfeature for each phase: Fluid, Porous Matrix, and optionally, Immobile Fluids. This new workflow provides added clarity and improves the user experience. It also facilitates multiphysics couplings in porous media in a more natural way. Combined with the Moisture Transport and Porous Media Flow interfaces, the heat transfer in porous media improvements enable the modeling of nonisothermal flow and latent heat storage in porous media.
You can see this new setup in the following models:
- heat_pipe
- frozen_inclusion
- evaporation_porous_media_large_rate
- porous_microchannel_heat_sink
- convection_porous_medium
- carbon_deposition
- monolith_3d
- steam_reformer
Revamped Porous Media Features for Transport of Diluted Species
The Transport of Diluted Species in Porous Media interface is revamped to use the new Porous Medium node. Two new domain features, the Porous Medium and the Unsaturated Porous Medium nodes, are available in the Transport of Diluted Species in Porous Media interface. You can use the new Porous Medium node for assigning material properties to the multiple phases in a porous medium. The new nodes have dedicated containers to define the properties for the liquid, gas, and porous matrix. You can see this functionality demonstrated in the Ceramic Water Filter with Activated Carbon Core tutorial model.
Automatic Detection of Ideal Gas Material in Heat Transfer in Fluids
The Fluid feature, available within the various heat transfer interfaces, has been updated to take advantage of the ideal gas assumption to improve computational efficiency. The new From material option of the Fluid type list automatically detects whether the material applied on each domain selection is an ideal gas or not, and uses the relevant properties for either case. This may speed up computation when computing pressure work in compressible nonisothermal flows, for example. Since the gases available in COMSOL Multiphysics® and in the Material Library are modeled as ideal gases, many models with compressible nonisothermal flow are expected to benefit from this improvement.
New Tutorial Models
COMSOL Multiphysics® version 5.6 brings three new tutorial models to the Chemical Reaction Engineering Module.
Beer Fermentation Reactor
Application Library Title:
beer_fermentation
Download from the Application Gallery