案例集锦

COMSOL Multiphysics 案例库模型来自广泛的应用领域,包括电气、机械、流体和化工等行业。您可以下载现成即可使用的模型,以及详细的建模步骤说明,作为您建模工作的起点。请使用“快速搜索”查找与您的专业领域相关的模型,并登录或创建一个与有效的 COMSOL 许可证相关联的 COMSOL Access 帐户,下载模型文件。

Nonisothermal HI Reactor

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.

Space-Dependent HI Reactor

This model deals with a reacting system comprising of an equimolar mixture of hydrogen and iodine gas which is allowed to react and form HI. Composition and temperature are allowed to vary both in space and time. This means that you have to define material balances, energy balances, and transport properties in the Reaction Engineering interface. These balances and properties are exported to ...

Parameter Estimation for Nonideal Reactor Models

Real reactors can be modeled as combinations of ideal reactors. In this example two ideal CSTRs with interchange are used to model a real reactor with one highly agitated region and another region with less agitation. Two parameters, relating the volume and exchange rate of the two regions, need to be found by comparing the model results to experimental tracer data. Using the Parameter Estimation ...

Isoelectric Separation

This modeling example applies the Transport of Diluted Species interface to model a separation process. A stream containing six different ionic species is divided into pure component streams by means of migrative transport in an electric field. Free flow electrophoresis can be used to separate macromolecules such as proteins, based on their mobility perpendicular to the flow of the carrier fluid. ...

Isothermal HI Reactor

For a perfectly mixed reactor with a predefined constant temperature, the reacting system’s energy balance is not needed to describe the system behavior. The behavior is defined as the composition and the production or consumption of species over time. Furthermore, because the reactor is perfectly mixed, the Reaction Engineering interface can also set up a model even though it has no ...

Variations in Density in Porous Media Flow

This example studies the steady flow of an ideal gas in porous media, where variations in gas density are taken into account through Equation-based Modeling. Darcy’s law describes the velocity vector in the porous structure and the conservation of mass is accounted for by the ideal gas law. The studied system is a packed bed reactor of the type used for example in small scale reforming ...

Cylindrical Catalyst Pellet

Porous catalyst particles are widely used in the chemical industry and are extensively treated in the chemical engineering literature. The catalyst pellets are, in most cases, fluidized by the action of a gas or liquid flowing through a reactor. The fluid enters at the bottom of a bed of catalyst particles and the particles are fluidized by the shear force that the fluid exerts on their ...

Fine Chemical Production in a Plate Reactor

Plate reactors running under continuous conditions have emerged as candidates to replace batch reactors, primarily in fine chemicals and pharmaceuticals production. One of the advantages of the plate reactor design is that it allows for efficient temperature control of the reacting fluid. For instance, this means that the heat released from strongly exothermic reactions can be readily dissipated ...

Monolithic Reactor

This model simulates the catalytic abatement of a volatile organic compound (VOC), in this case a contaminant in a waste gas. An analytical expression describes the velocity profile in the free channel, while reaction occurs in the washcoat that makes up the tubular shape of the free channel. For simple geometries, the reactor can be described by a 2D model using time as the axial direction ...

Diffusion of Gas Through a Reinforced 3D Membrane

In this example, we study the diffusion of a chemical species through a membrane. The system is used to measure the permeability of gases in membranes. The permeability of the membrane is measured by introducing the species of interest in a carrier gas on one side of the membrane and the pure carrier gas on the other side of the membrane. In this model, the initial flux in the membrane is ...

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