Advection-diffusion in inertial flow through periodically converging-diverging tubes Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/q811kn33x

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  • A direct numerical simulation of advection-diffusion in a sinusoidal tube was carried out using the commercial finite-volume code STAR-CD. The Reynolds numbers varied from Re = 0.1 to Re = 14.5. At the larger Reynolds numbers, steady-state eddies formed in the diverging sections and significantly influenced the macroscale dispersion. Long tailing was observed in the breakthrough curves. The results were compared to a 1-dimensional source-sink model using the semi-analytical solute transport code STAMMT-L. It was found that the results were generally described by both a single-rate model and a lognormal multi-rate model. It was observed that the velocity distribution within the inertial regime had significant influence on dispersion, even at weak inertial flowrates which did not experience flow separation.
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