The Transport of Diluted Species in pipes (dsp) interface (), found under the Chemical Species Transport branch () when adding a physics interface, is used to model a mass balance equation for pipes in order to compute the concentration distribution of a solute in a dilute solution, taking into account diffusion, dispersion, convection, and chemical reactions. The physics interface approximates the concentration profile in pipes and channels by a 1D assumption on lines in 2D and 3D. Depending on additional add-on products, multiple species can be modeled.

When this physics interface is added, these default nodes are also added to the Model Builder — Convection and Diffusion, Concentration, and Initial Values. Then, from the Physics toolbar, add other nodes that implement, for example, boundary conditions and volume forces. You can also right-click Transport of Diluted Species in Pipes to select physics features from the context menu.

The Reacting Pipe Flow Interface node uses this physics interface and couples it automatically to Pipe Flow and Heat Transfer in pipes.

The Label is the default physics interface name.

The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.

The default Name (for the first physics interface in the model) is dsp.

Select a Fluid model — Newtonian (the default), Power law, or Bingham.

This physics interface defines these dependent variables (fields)—Number of concentrations c (SI unit: mol/m3) and Concentrations.

To display all settings available in this section, click the Show button () and select Advanced Physics Options.