CHEMO-hydrodynamic coupling between forced advection in porous media and self-sustained chemical waves

Atis, Severine; Saha, Sandeep; Auradou, Harold; Martin, James E.; Rakotomalala, N.; Talon, Laurent; Salin, D.

doi:10.1063/1.4734489

Cited by 11 publications

(10 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such propagation in simple flows has been addressed recently [7,9]. In more complex situations from the point of view of either the chemistry [10,11] or the flow field [8,[12][13][14], it has been reported that when the flow is opposing the chemical front, frozen, i.e., static, fronts can be observed not only for a particular flow intensity, but also over a wide range of flow intensity values. Those frozen states have been observed experimentally but not fully understood.…”

mentioning

confidence: 99%

Phase diagram of sustained wave fronts opposing the flow in disordered porous media

Saha¹,

Atis²,

Salin³

et al. 2013

EPL

View full text Add to dashboard Cite

Using lattice Boltzmann simulations, we analyze the different regimes of propagation of an autocatalytic reaction front in heterogenous porous media. The heterogeneities of the porous medium are characterized by the standard deviation of its log-normal distribution of permeability and its correlation length. We focus on the situation where chemical reaction and flow field act in opposite directions. In agreement with previous experiments we observe upstream, downstream fronts as well as static, frozen ones over a range of flow velocity which depends drastically on the heterogeneities of the flow field. The transition between the static regime and the downstream one account for large enough low-velocity zones, whereas the transition from static to upstream regime is found to be given by a kind of percolation path. editor's choice

show abstract

mentioning

confidence: 99%

Phase diagram of sustained wave fronts opposing the flow in disordered porous media

Saha¹,

Atis²,

Salin³

et al. 2013

EPL

View full text Add to dashboard Cite

show abstract

“…Above a critical temperature, the front remains stable and thus planar. In a combination of experiments and Lattice-Boltzmann based simulations, Atis et al 51 complement the foregoing works by two new elements. First, they study the interaction of autocatalytic fronts with porous media.…”

Section: Convection Around Self-organized Reaction Frontsmentioning

confidence: 88%

Introduction to the Focus Issue: Chemo-Hydrodynamic Patterns and Instabilities

Wit¹,

Eckert²,

Kalliadasis³

2012

Chaos: An Interdisciplinary Journal of Nonlinear Science

View full text Add to dashboard Cite

Pattern forming instabilities are often encountered in a wide variety of natural phenomena and technological applications, from self-organization in biological and chemical systems to oceanic or atmospheric circulation and heat and mass transport processes in engineering systems. Spatiotemporal structures are ubiquitous in hydrodynamics where numerous different convective instabilities generate pattern formation and complex spatiotemporal dynamics, which have been much studied both theoretically and experimentally. In parallel, reaction-diffusion processes provide another large family of pattern forming instabilities and spatio-temporal structures which have been analyzed for several decades. At the intersection of these two fields, "chemo-hydrodynamic patterns and instabilities" resulting from the coupling of hydrodynamic and reaction-diffusion processes have been less studied. The exploration of the new instability and symmetry-breaking scenarios emerging from the interplay between chemical reactions, diffusion and convective motions is a burgeoning field in which numerous exciting problems have emerged during the last few years. These problems range from fingering instabilities of chemical fronts and reactive fluid-fluid interfaces to the dynamics of reaction-diffusion systems in the presence of chaotic mixing. The questions to be addressed are at the interface of hydrodynamics, chemistry, engineering or environmental sciences to name a few and, as a consequence, they have started to draw the attention of several communities including both the nonlinear chemical dynamics and hydrodynamics communities. The collection of papers gathered in this Focus Issue sheds new light on a wide range of phenomena in the general area of chemo-hydrodynamic patterns and instabilities. It also serves as an overview of the current research and state-of-the-art in the field. Chemo-hydrodynamic patterns and instabilities appear in out of equilibrium systems when chemical reactions and diffusion interplay with advection or convection processes. Complex spatio-temporal evolution of concentrations can then set in due to the highly nonlinear character of the underlying dynamics. In this Focus issue, 13 articles discuss recent advances in the area of chemohydrodynamic patterns and instabilities. These articles are representative of three classes of problems in which chemo-hydrodynamic structures are commonly observed and for which simpler model systems can help unraveling key aspect of the dynamics.

show abstract

“…For downstream fronts, the separation between the two branches becomes thinner and thinner as u increases and can lead to a pinch-off, followed by a detachment as observed in [17].…”

Section: Two Types Of Frozen Front In Uniform Flow Past a Solid Diskmentioning

confidence: 99%

“…These fronts are analogous to flames in combustion [4] and autocatalytic reactions are a kind of "cold combustion model" especially in the thin flame limit. In contrast to flame propagation in combustion [4], where it has been analyzed thoroughly theoretically and experimentally, the effect of fluid flow (laminar or turbulent) on reaction fronts has not been explored in detail until recently [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In the presence of an hydrodynamic flow, it has already been observed and understood that such fronts while propagating at a new constant velocity, adapt their shape in order to achieve a balance between reaction diffusion and flow advection.…”

Section: Introductionmentioning

confidence: 99%

Frozen fronts selection in flow against self-sustained chemical waves

2017

Self Cite

View full text Add to dashboard Cite

Autocatalytic reaction fronts between two reacting species in the absence of fluid flow, propagate as solitary waves. The coupling between autocatalytic reaction front and forced hydrodynamic flow may lead to stationary front whose velocity and shape depend on the underlying flow field. We focus on the issue of the chemo-hydrodynamic coupling between forced advection opposed to self-sustained chemical waves which can lead to static stationary fronts, i.e Frozen Fronts, F F . Towards that purpose, we perform experiments, analytical computations and numerical simulations with the autocatalytic Iodate Arsenious Acid reaction (IAA) over a wide range of flow velocities around a solid disk. For the same set of control parameters, we observe two types of frozen fronts: an upstream F F which avoid the solid disk and a downstream F F with two symmetric branches emerging from the solid disk surface. We delineate the range over which we do observe these Frozen Fronts. We also address the relevance of the so-called eikonal, thin front limit to describe the observed fronts and select the frozen front shapes.

show abstract

CHEMO-hydrodynamic coupling between forced advection in porous media and self-sustained chemical waves

Cited by 11 publications

References 49 publications

Phase diagram of sustained wave fronts opposing the flow in disordered porous media

Phase diagram of sustained wave fronts opposing the flow in disordered porous media

Introduction to the Focus Issue: Chemo-Hydrodynamic Patterns and Instabilities

Frozen fronts selection in flow against self-sustained chemical waves

Contact Info

Product

Resources

About