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

Karan, Pratyaksh; Ghosh, Uddipta; Méheust, Yves; Le Borgne, Tanguy

doi:10.1016/j.advwatres.2023.104521

Advances in Water Resources

2023

DOI: 10.1016/j.advwatres.2023.104521

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

Pratyaksh Karan,

Uddipta Ghosh,

Yves Méheust

et al.

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2024

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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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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

View full text Add to dashboard Cite

show abstract

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

Cited by 1 publication

References 44 publications

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

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

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