An effective analytical–algorithmic approach to solve diffusion-type differential equations with non-linear sources: Unbounded domains
Section snippets
Introduction and objectives
Oyanader and Arce (2005a) has recently introduced an analytical–algorithmic approach to solve differential equations with a non-linear source that shows a fast convergence rate and it is not dependent of the mesh size of the domain of such equation. The approach has been successfully applied to model hydrodynamic flows in electrokinetic applications in soil remediation and bioseparations with capillaries of a variety of geometries (Oyanader & Arce, 2005b; Oyanader, Arce, & Dzurik, 2003;
Mathematical details of the approach
This section is devoted to present the mathematical formalism needed for the derivation of the novel analytical–algorithmic approach. This includes a step by step description of the procedure as well as the general solution strategy used to identify the new correcting function, fAO, introduced by Oyanader and Arce, 2005a, Oyanader and Arce, 2005b for bounded domains. Since our interest is in developing a tool for the solution of these non-linear models, the mathematical description will be kept
Examples and illustrative results
To illustrate the methodology, this section includes three examples that deal with unbounded domains, that is, electrostatic potentials in rectangular, cylindrical, and spherical geometries. These domains are typical situations that maybe found in electrode and/or particles in solution or cells for a variety of applications including electrokinetics soil cleaning, electrochemical cells, and others. See for example, Oyanader (2004), Oyanader and Arce (2005a), and Oyanader et al., 2003, Oyanader
Summary and concluding remarks
Diffusion-reaction type of differential models form a large family that has many interesting applications in chemical engineering areas. In general, these models show non-linear sources that involve, for example, chemical reactions, electrostactic potential, and biological enzyme reactions. Many of these situations are usually coupled with other field equations such as, for example, hydrodynamic flow equations related to the buffer solution where solutes may undergo diffusive-convective
Acknowledgements
The support provided by Universidad Católica de Norte, Chile, and the Fulbright Commission to the doctoral work of Mario A. Oyanader is specially acknowledged.
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Present address: Department of Chemical Engineering, Tennessee Technological University, Prescott Hall 214, Cookeville, TN 38505, USA.