Pipe Geometry

The first three input fields in the Pipe pathway dialog describe the overall geometry of the Pipe.

Length: This is the length of the pathway.

Area: This is the cross-sectional area of the pipe. This area includes the mobile (flowing) zone and the stagnant zone (if one is defined). It does not, however, include any areas associated with any matrix diffusion zones or coating that may be defined. If an infill medium is specified, it fills the area.

Perimeter: This is the wetted perimeter of the pathway. For example, if your Pipe was being used to represent a saturated fracture defined by two parallel plates 0.2 m wide and 0.001 m apart, the perimeter would be defined as 0.402 m. It is only used if you specify that the Pipe has a coating or one or more matrix diffusion zones. If neither of these two situations apply, the input is ignored. The perimeter has dimensions of length.

Note: If the perimeter is specified as 0, any specified coatings and matrix diffusion zones will have no impact on the behavior of the Pipe.