31 May 2021 to 4 June 2021
Europe/Berlin timezone

Upscaling Inertia Effects on Mixing and Reaction at Channel Intersections from Flow Topology

31 May 2021, 09:55
15m
Oral Presentation (MS21) Non-linear effects in flow and transport through porous media MS21

Speaker

Peter Kang (University of Minnesota)

Description

Flow and mixing at channel intersections are of broad interest because fluids with distinctive properties can efficiently mix and react at intersections, thereby controlling mixing and reaction processes in natural and engineered fractured and porous media. Recent studies showed that mixing and reaction hot spots are strongly linked with flow topological properties that form the backbone of underlying flow fields. In particular, stagnation points are related to strong stretching, folding, and flow separation, thereby governing overall mixing and reaction dynamics. Lee and Kang 2020 [Physical Review Letters, 124(14)] namely observed that inertia effects can induce recirculating flows at channel intersections and showed that the recirculating flows associated with stagnation points initiate local reaction hot spots, that is, locations where reaction rates are locally maximum. Nevertheless, there has been no systematic study on how diverse flow topologies emerge at channel intersections and how they control mixing and reaction dynamics at intersections.

In this study, we combine laboratory microfluidic experiments, pore-scale numerical simulations, flow topology analysis, and lamella mixing theory to establish a predictive framework that links flow topological properties to mixing and reaction properties. We systematically vary both the injection rate and injection rate ratio between the two inlets to elucidate how various flow topologies emerge at channel intersections as a function of the Reynolds number and injection rate ratio. We then establish a quantitative link between flow topology, mixing, and reaction rates. Finally, we upscale mixing and reaction at channel intersections using the lamella mixing theory and show how the key parameters of the upscaled model can be estimated from the flow properties.

References

Lee, S.H. and Kang, P.K., 2020. Three-dimensional vortex-induced reaction hot spots at flow intersections. Physical review letters, 124(14), p.144501.

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Primary authors

Peter Kang (University of Minnesota) Sang Lee Woonghee Lee (UNIVERSITY OF MINNESOTA) Dr Etienne Bresciani Marco Dentz (IDAEA-CSIC)

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