Related Experiment Video
Updated: Aug 29, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
Speed of reaction-diffusion fronts in spatially heterogeneous media
Vicenç Méndez1, Joaquim Fort, Horacio G Rotstein
1Departament de Medicina, Facultat de Ciències de la Salut, Universitat Internacional de Catalunya, c/ Gomera s/n, 08190-Sant Cugat del Vallès (Barcelona), Spain.
Abstract:
The front speed problem for nonuniform reaction rate and diffusion coefficient is studied by using singular perturbation analysis, the geometric approach of Hamilton-Jacobi dynamics, and the local speed approach. Exact and perturbed expressions for the front speed are obtained in the limit of large times. For linear and fractal heterogeneities, the analytic results have been compared with numerical results exhibiting a good agreement. Finally we reach a general expression for the speed of the front in the case of smooth and weak heterogeneities.
More Related Videos
15:10From Fast Fluorescence Imaging to Molecular Diffusion Law on Live Cell Membranes in a Commercial Microscope
Published on: October 9, 2014
09:56Adapting Taylor Dispersion to Measure the Dispersion Coefficient of Electrolyte Solutions via an Accessible Microfluidic Setup
Published on: October 7, 2025
Related Concept Videos
Diffusion
Diffusion
Fast Reactions
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Protein Diffusion in the Membrane
Passive Diffusion: Overview and Kinetics
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...