Model Gallery

The Model Gallery features COMSOL Multiphysics model files from a wide variety of application areas including the electrical, mechanical, fluid, and chemical disciplines. You can download ready-to-use models and step-by-step instructions for building the model, and use these as a starting point for your own modeling work. Use the Quick Search to find models relevant to your area of expertise, and login or create a COMSOL Access account that is associated with a valid COMSOL license to download the model files.

Fixed Bed Reactor for Catalytic Hydrocarbon Oxidation - new

Tubular reactors are generally modelled with the assumption that the concentration and temperature gradients only occur in the axial direction. The only transport mechanism operating in this direction is the overall flow itself, which is considered to be of plug-flow. In this example a more general approach is taken, an approach that accounts for variations of the concentrations and temperature ...

Maxwell-Stefan Diffusion in a Fuel Cell Unit Cell - new

In concentrated gases and liquids, where the concentrations of species are of the same order of magnitude, there is no obvious solvent-solute relationship. Fick’s law for diffusion accounts only for one-way solute-solvent interactions whereas the Maxwell-Stefan equations account for all interactions of species in a solution. In a system with three components, three pair-wise interactions are ...

Electrophoresis, Transport in a Capillary Column

The electrophoresis of a mixture containing benzoic acid and chlorobenzoic acid, with sodium acetate as background electrolyte, is studied in a model that includes the transport of the involved species through diffusion and migration. The transport equations are combined with the material balances and the electroneutrality condition. The neutralization reaction for all the involved acid-base ...

Estimating Thermal Dispersion in a Packed Bed - new

Thermal dispersion in a porous medium results from the combined effects of heat conduction in the fluid and solid phases, and from convective transport in the fluid. In chemical process engineering, the modeling of thermal dispersion is of central importance as the temperature distribution in a catalyst bed controls not only chemical conversion but also the catalyst life-time. In this model ...

Optimization of a Catalytic Microreactor - new

In this model, a solution is pumped through a catalytic bed where a solute species reacts as it gets in contact with the catalyst. The purpose of the model is to maximize the total reaction rate for a given total pressure difference across the bed by finding an optimal catalyst distribution. The distribution of the porous catalyst determines the total reaction rate in the bed. A large amount of ...

Determining Arrhenius Parameters using Parameter Estimation - new

This model shows how to use the Parameter Estimation feature in the Reaction Engineering interface to find the Arrhenius parameters of a first order reaction where Benzene diazonium chloride decomposes to benzene chloride and nitrogen.

Degradation of DNA in Plasma - new

Biotechnology is a rapidly growing area in the pharmaceutical sciences. One example of a clinical application is gene therapy, where it is possible to produce proteins in vivo, using the body’s own mechanisms for protein production. Major issues in gene delivery involve the transport of plasmid DNA (pDNA) to target sites and the conversion between different forms of pDNA. This model ...

Determining the Reaction Order from Pressure-Time Data - new

This model shows how to use the Parameter Estimation feature in the Reaction Engineering interface to find the rate constant and reaction order for the gas phase decomposition of di-tert-butyl-peroxide.

Nonisothermal HI Reactor - new

In the case of a perfectly mixed nonisothermal system, you have to set up both the time-dependent material and energy balances. There are no spatial concentration gradients because the system is perfectly mixed, so the Reaction Engineering interface can create a model without evaluating the material-transport properties.

Hydrocarbon Dehalogenation in a Tortuous Microreactor - new

Removing halogen groups from hydrocarbons is an important reaction step in several chemical processes. One application is water purification. Other examples involve organic synthesis, where the removal of halogen groups serves as a starting point for carbon-carbon coupling reactions. Typically, the carbon-halogen bond scission is activated by precious metal catalysts based on platinum or ...

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