# Flow in a Rectangular Channel with Double Orthogonal Collocation

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Flow in a rectangular channel is a common problem encountered in the design of heat exchangers, monolithic reactors, and filters in combustion engines. This Demonstration shows the solution of the problem in a rectangular channel by means of a double-orthogonal collocation method.

Contributed by: Jorge Gamaliel Frade Chávez (March 2011)

Open content licensed under CC BY-NC-SA

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## Details

A dimensionless mathematical model for flow in a rectangular channel is given in the following elliptic partial differential equation:

,

where is the velocity, and * *are positions in dimensionless units, with the boundary conditions , at and .

Reference: J. V. Villadsen and W. E. Stewart, "Solution of Boundary-Value Problems by Orthogonal Collocation," *Chemical Engineering Science*, 22, 1967 pp. 3981–3996.

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