Nanotech 2006 Vol. 2
Nanotech 2006 Vol. 2
Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 2

Micro & Nano Fluidics Chapter 8

Computational experiments on three-dimensional molecular diffusion in porous media

Authors: V.J. Alarcon, W. Kingery and J. Zhu

Affilation: Mississippi State University, United States

Pages: 593 - 597

Keywords: flow-through reactor, polymerase chain reaction (PCR), thermocycling, microchannel, lab-on-a-chip, multiphysics simulation

Estimations of apparent diffusion coefficients usually consist of curve-fitting the output of one-dimensional models to experimental laboratory-measured data from porous aggregates shaped in different forms. In this research a computational exploration is presented on the alternative use of three-dimensional models for the same purpose. Saturated conditions and absence of retention mechanisms for the solute were assumed. The outputs of the three di-mensional models were averaged and compared to the results generated by the one-dimensional formulations. The comparison showed that there are signifi-cant discrepancies in the concentration values output by the models. Percent differences ranging from 30 to 90% were calculated. Those different estima-tions suggest that different values of the apparent diffusion coefficient may be obtained if the three-dimensional solution of the diffusion equation would be used to match experimental results.

ISBN: 0-9767985-7-3
Pages: 893
Hardcopy: $119.95