Dynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mo>+</mml:mo><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>C</mml:mi></mml:mrow></mml:math>reaction fronts under radial advection in a Poiseuille flow

Comolli, Alessandro; Wit, A. De; Brau, Fabian

doi:10.1103/physreve.104.044206

Cited by 7 publications

(26 citation statements)

References 41 publications

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“…11a, in good agreement with the theoretical prediction. Likewise, the evolution of r C is close to the / t 0:5 scaling proposed by Comolli et al (2021). Indeed, we expect the gravity effects present in both the PF and the ground experiments to have a stronger impact on the position of the maximum C concentration (r C ), as this should coincide with the position of the highest density gradients.…”

Section: Geometrical Front Propertiessupporting

confidence: 81%

“…The decrease at the beginning is ascribed to the non-ideal initial conditions, i.e., the spreading of the premixed volume as described above. The constant final width W C qualitatively agrees with the progression predicted from theory (Comolli et al, 2021). In more detail, by utilizing an estimation for the governing time scale of the RDA dynamics (Comolli et al, 2021), we get a critical time, t c :…”

Section: Geometrical Front Propertiessupporting

confidence: 78%

“…The constant final width W C qualitatively agrees with the progression predicted from theory (Comolli et al, 2021). In more detail, by utilizing an estimation for the governing time scale of the RDA dynamics (Comolli et al, 2021), we get a critical time, t c :…”

Section: Geometrical Front Propertiessupporting

confidence: 78%

“…This system was chosen for our radial injection study as the reaction front can be directly captured by absorption measurements: the product is intense in color in contrast to the colorless ractants (Tóth et al, 2020). Moreover, the fast reaction kinetics allows us to draw comparisons with existing theoretical RDA predictions, which assume instantaneous reaction (Brau et al, 2017;Comolli et al, 2019;Comolli et al, 2021). The experiments were performed in a quasi-two-dimensional planar geometry using the Hele-Shaw cell design described below.…”

Section: Chemical Reaction Experimental Setup and Image Analysismentioning

confidence: 99%

“…To account for Taylor dispersion, an approximate model for the non-uniform velocity field in the gap was included in Tóth et al (2020). Later, an actual 2D numerical study of a reaction front in a radial Poiseuille flow was conducted (Comolli et al, 2021). Nevertheless, the full interaction of hydrodynamics and diffusive mixing can lead to more complex spatio-temporal concentration distributions in propagating concentration fronts (Perez et al, 2019;Guilbert et al, 2021), which can also depend on the initial conditions even in the long-time regime (Balakotaiah et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of gravity modulation on the dynamics of a radial A+B→C reaction front

Stergiou

Hauser

Comolli

et al. 2022

Chemical Engineering Science

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Section: Geometrical Front Propertiessupporting

confidence: 81%

Section: Geometrical Front Propertiessupporting

confidence: 78%

Section: Geometrical Front Propertiessupporting

confidence: 78%

Section: Chemical Reaction Experimental Setup and Image Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of gravity modulation on the dynamics of a radial A+B→C reaction front

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et al. 2022

Chemical Engineering Science

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Impact of hydrodynamic dispersion on mixing-induced reactions under radial flows

Karan,

Ghosh,

Méheust

et al. 2023

Advances in Water Resources

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Unraveling dispersion and buoyancy dynamics around radial A + B → C reaction fronts: microgravity experiments and numerical simulations

Stergiou,

Escala,

Papp

et al. 2024

npj Microgravity

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Radial Reaction–Diffusion–Advection (RDA) fronts for A + B → C reactions find wide applications in many natural and technological processes. In liquid solutions, their dynamics can be perturbed by buoyancy-driven convection due to concentration gradients across the front. In this context, we conducted microgravity experiments aboard a sounding rocket, in order to disentangle dispersion and buoyancy effects in such fronts. We studied experimentally the dynamics due to the radial injection of A in B at a constant flow rate, in absence of gravity. We compared the obtained results with numerical simulations using either radial one– (1D) or two–dimensional (2D) models. We showed that gravitational acceleration significantly distorts the RDA dynamics on ground, even if the vertical dimension of the reactor and density gradients are small. We further quantified the importance of such buoyant phenomena. Finally, we showed that 1D numerical models with radial symmetry fail to predict the dynamics of RDA fronts in thicker geometries, while 2D radial models are necessary to accurately describe RDA dynamics where Taylor–Aris dispersion is significant.

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Dynamics ofA+B→Creaction fronts under radial advection in a Poiseuille flow

Cited by 7 publications

References 41 publications

Effects of gravity modulation on the dynamics of a radial A+B→C reaction front

Effects of gravity modulation on the dynamics of a radial A+B→C reaction front

Impact of hydrodynamic dispersion on mixing-induced reactions under radial flows

Unraveling dispersion and buoyancy dynamics around radial A + B → C reaction fronts: microgravity experiments and numerical simulations

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