Measurement of local chemical reaction rate in a microchannel by using luminol chemiluminescence

Matsumoto, Ryosuke; Matsuo, Ruru

doi:10.1016/j.expthermflusci.2014.11.013

Cited by 1 publication

(2 citation statements)

References 14 publications

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“…The reaction rate is thus proportional to the intensity of the emitted blue light. This reaction can be approximated by the bimolecular second-order reaction (Matsumoto & Matsuo, 2015),…”

Section: Chemiluminescence Reaction For Reactive Mixingmentioning

confidence: 99%

“…The reaction rate is thus proportional to the intensity of the emitted blue light. This reaction can be approximated by the bimolecular second‐order reaction (Matsumoto & Matsuo, 2015),

\mathrm{A}+\mathrm{B}\to \mathrm{C}+\text{photon}

where A and B are associated to the H 2 O 2 and the luminol species respectively. Please note that the actual reaction process is not one‐step bimolecular reaction, but it involves several reaction steps.…”

Section: Pore Scale Imaging Of Mixing and Reaction At Stagnation Pointsmentioning

confidence: 99%

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Enhanced Mixing and Reaction in Converging Flows: Theory and Pore‐Scale Imaging

Izumoto

Heyman

Huisman

et al. 2023

Water Resources Research

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Mixing fronts at the interface of opposing flows are compressed at a constant rate. The resulting exponential stretching of fluid elements leads to enhanced chemical gradients and biogeochemical processes. This process is similar as what occurs in the pore space of 3D chaotic flows. However, it is so far not known how such fluid compression controls the amplitude of mixing and reaction rates in porous media. Here we derive analytical predictions for the mixing width, the maximum reaction rate and the reaction intensity in compressed mixing fronts as a function of the Péclet and Damköhler numbers. We developed an experimental setup providing pore scale measurements of mixing and reaction rates in mixing fronts at the interface of converging flows. The theory accurately predicts the scaling of mixing and reaction with the Péclet number both in porous micromodels and simple Hele‐Shaw cells. Additionally, we found that the presence of pore scale heterogeneities in the porous micromodels enhances reaction rates by a factor of 4 compared to the Hele‐Shaw cells. Using numerical simulations of pore scale velocity fields, we attributed this phenomenon to the enhancement of pore‐scale compression due to the presence of grains in accelerating flows. These findings provide new insights into the dynamics of mixing‐induced reactions in porous media.

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“…The reaction rate is thus proportional to the intensity of the emitted blue light. This reaction can be approximated by the bimolecular second-order reaction (Matsumoto & Matsuo, 2015),…”

Section: Chemiluminescence Reaction For Reactive Mixingmentioning

confidence: 99%

“…The reaction rate is thus proportional to the intensity of the emitted blue light. This reaction can be approximated by the bimolecular second‐order reaction (Matsumoto & Matsuo, 2015),