References of "Dauby, Pierre"
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See detailMécanique des fluides
Dauby, Pierre ULg

Learning material (2007)

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See detailExtended Galerkin-Eckhaus method in nonlinear thermoconvection
Dondlinger, Mireille; Margerit, Jonathan; Dauby, Pierre ULg

in Journal of Non-Equilibrium Thermodynamics (2007), 32(2), 155-179

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See detailA unified extended thermodynamic description of diffusion, thermo-diffusion, suspensions, and porous media
Lebon, Georgy ULg; Desaive, Thomas ULg; Dauby, Pierre ULg

in Journal of Applied Mechanics-Transactions of the Asme (2006), 73(1), 16-20

It is shown that extended irreversible thermodynamics (EIT) provides a Unified description of a great variety of processes, including matter diffusion, thermo-diffusion, suspensions, and fluid flows in ... [more ▼]

It is shown that extended irreversible thermodynamics (EIT) provides a Unified description of a great variety of processes, including matter diffusion, thermo-diffusion, suspensions, and fluid flows in porous media. This is achieved by enlarging the set of classical variables, as mass, momentum and temperature by the corresponding fluxes of mass, momentum and heat. For simplicity, we consider only Newtonian fluids and restrict ourselves to a linear analysis: quadratic and higher order terms in the fluxes are neglected. In the case of diffusion in a binary mixture, the extra flux variable is the diffusion flux of one the constituents, say the solute. In thermo-diffusion, one adds the heat flux to the set of variables. The main result of the present approach is that the traditional equations of Fick, Fourier Soret, and Dufour are replaced by time-evolution equations for the matter and heat fluxes, such generalizations are useful in high-frequency processes. It is also shown that the analysis can be easily extended to the study of particle suspensions in fluids and to flows in porous media, when such systems can be viewed as binary mixtures with a solid and a fluid component. [less ▲]

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See detailDynamics of spontaneous ventricular fibrillation in acutely ischemic pigs
Desaive, Thomas ULg; Janssen, Nathalie ULg; Péters, F. et al

in Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology (2006), 8 (supplement 1)

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See detailPhysical mechanism of standing waves in cardiac electrical activity.
Dauby, Pierre ULg; Desaive, Thomas ULg; Croisier, H. et al

in SIAM conference on nonlinear waves and coherent structures (2006)

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See detailStanding waves in the FitzHugh-Nagumo model of cardiac electrical activity.
Dauby, Pierre ULg; Desaive, Thomas ULg; Croisier, H. et al

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2006), 73(2 Pt 1), 021908

When excitable media are submitted to appropriate time dependent boundary conditions, a standing wavelike pattern can be observed in the system, as shown in recent experiments. In the present analysis ... [more ▼]

When excitable media are submitted to appropriate time dependent boundary conditions, a standing wavelike pattern can be observed in the system, as shown in recent experiments. In the present analysis, the physical mechanism explaining the occurrence of such space-time patterns is shown to be a competition between Ohmic diffusion and an action potential propagation across the system, coupled with the existence of refractory states for excitable media. [less ▲]

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See detailOn the use of Galerkin-Eckhaus method to study the nonlinear regime of Marangoni-Benard instabilities in an evaporating liquid layer
Margerit, Jonathan; Dondlinger, Mireille; Dauby, Pierre ULg

in European Physical Journal B -- Condensed Matter (2006), 54(4), 485-492

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See detailLinear and nonlinear analyses of convective instabilities in evaporating liquid layers
Dauby, Pierre ULg; Dondlinger, Mireille; Marjerit, Jonathan et al

in Bulletin of the American Physical Society, Vol. 45, n°9 (2005, November)

The present work consists in a theoretical study of Rayleigh- B'enard-Marangoni instabilities in an evaporating horizontal liquid layer which is surmounted by a mixture of its vapour and an inert gas. The ... [more ▼]

The present work consists in a theoretical study of Rayleigh- B'enard-Marangoni instabilities in an evaporating horizontal liquid layer which is surmounted by a mixture of its vapour and an inert gas. The fluid and the gas mixture form a 2-layer system but simplified models can be built to analyse the behaviour of the system. In particular, a 1-layer model can be deduced by introducing a generalized Biot number. In the so- called 1.5-layer approximation, the behaviour of the gas is simplified by only keeping the linear equation of vapour diffusion. In the linear study of thermoconvective instabilities, both simplified models are shown to be in good agreement with the complete 2-layer system. For the non linear approach, only the simplified models are considered. A Galerkin-Eckhaus method is used to deduce amplitude equations for the weakly nonlinear analysis of the problem. The stability domains for the rolls, squares and hexagonal patterns emerging above threshold are determined. Both water and ethanol are used as fluids, while the inert gas is assumed to be air. [less ▲]

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See detailConvection and interfacial mass exchange
Colinet, P.; Legros, Jean-Claude; Dauby, Pierre ULg et al

in ESA Special Publication (2005, October 01)

Mass-exchange through fluid interfaces is ubiquitous in many natural and industrial processes. Yet even basic phase-change processes such as evaporation of a pure liquid are not fully understood, in ... [more ▼]

Mass-exchange through fluid interfaces is ubiquitous in many natural and industrial processes. Yet even basic phase-change processes such as evaporation of a pure liquid are not fully understood, in particular when coupled with fluid motions in the vicinity of the phase-change interface, or with microscopic physical phenomena in the vicinity of a triple line (where the interface meets a solid). Nowadays, many industries recognise that this lack of fundamental knowledge is hindering the optimisation of existing processes. Their modelling tools are too dependent on empirical correlations with a limited - and often unknown - range of applicability. In addition to the intrinsic multiscale nature of the phenomena involved in typical industrial processes linked to interfacial mass exchange, their study is highly multi-disciplinary, involving tools and techniques belonging to physical chemistry, chemical engineering, fluid dynamics, non-linear physics, non-equilibrium thermodynamics, chemistry and statistical physics. From the experimental point of view, microgravity offers a unique environment to obtain valuable data on phase-change processes, greatly reducing the influence of body forces and allowing the detailed and accurate study of interfacial dynamics. In turn, such improved understanding leads to optimisation of industrial processes and devices involving phase-change, both for space and ground applications. [less ▲]

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See detailOn an Extended Irreversible Thermodynamic description of transient heat conduction in nano structures
Lebon, Georgy ULg; Dauby, Pierre ULg; Grmela, M.

in Proceedings of the 2d IEEES Conference (2005, July)

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See detailBallistic-diffusive heat conduction at nanoscale: GENERIC approach [rapid communication]
Grmela, M.; Lebon, Georgy ULg; Dauby, Pierre ULg et al

in Physics Letters A (2005), 339

Heat conduction in nanosize systems has to be studied in settings involving microscopic details that are not seen in the classical Fourier theory. G. Chen has suggested [Phys. Rev. Lett. 86 (2001) 2297] a ... [more ▼]

Heat conduction in nanosize systems has to be studied in settings involving microscopic details that are not seen in the classical Fourier theory. G. Chen has suggested [Phys. Rev. Lett. 86 (2001) 2297] a combination of the Cattaneo setting in which the velocity of the heat propagation is finite and the kinetic theory setting in which phonons are seen as heat carriers. In this Letter we show that if the Cattaneo and the kinetic theories are combined in a way that preserves the structure expressing their compatibility with thermodynamics (GENERIC structure) then both the Cattaneo and the kinetic equations become modified. The modified Cattaneo equations involve the term introduced by Chen and, in addition, new terms that are nonlinear in quantities that disappear at equilibrium. The kinetic equation is modified by new terms involving gradients of the heat flux and the local temperature. [less ▲]

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See detailElectrical mapping of spontaneous ventricular fibrillation in acutely ischemic pigs.
Desaive, Thomas ULg; Janssen, Nathalie; Péters, Fabrise et al

in Proceedings of the 5th Belgian Day on Biomedical Engineering, 2005, Brussels (2005)

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See detailClosed-loop model of the cardiovascular system including ventricular interaction and valve dynamics: application to pulmonary embolism
Desaive, Thomas ULg; Dutron, S.; Lambermont, Bernard ULg et al

in 12th International Conference on Biomedical Engineering (2005)

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See detailExperiments on the role of gas height in the Rayleigh-Marangoni instability problem.
Ozen, O.; Theisen, E.; Johnson, Duane T et al

in Journal of Colloid & Interface Science (2005), 289(1), 271-5

Experimental evidence is provided to show the effect of gas phase dynamics on the onset of thermal convection and on the accompanying patterns in a silicone oil-air convecting bilayer. Very good agreement ... [more ▼]

Experimental evidence is provided to show the effect of gas phase dynamics on the onset of thermal convection and on the accompanying patterns in a silicone oil-air convecting bilayer. Very good agreement with three-dimensional calculations for linearized stability is obtained mostly for small and large gas heights. Reasons for this agreement as well as the results at intermediate gas heights are qualitatively explained from the perspective of well-established nonlinear analysis. [less ▲]

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See detailImproved 1.5-sided model for the weakly nonlinear study of Benard-Marangoni instabilities in an evaporating liquid layer.
Margerit, Jonathan; Dondlinger, Mireille; Dauby, Pierre ULg

in Journal of Colloid & Interface Science (2005), 290(1), 220-30

Benard-Marangoni instability, with coupled gravity and surface tension effects, in an evaporating liquid layer surmounted by its vapor and an inert gas is investigated theoretically. We show that this ... [more ▼]

Benard-Marangoni instability, with coupled gravity and surface tension effects, in an evaporating liquid layer surmounted by its vapor and an inert gas is investigated theoretically. We show that this system can be described by a model that consists in the liquid layer equations plus the diffusion equation for the vapor in the gas (the so-called 1.5-sided model) and that this model is equivalent to a one-sided model when the vapor mass fraction field can be considered as quasi-stationary, provided that the equivalent Biot number is a nonlocal function of the interface temperature. A comparison of weakly nonlinear results for the 1.5-sided model with a previous one-sided model [M. Dondlinger, J. Margerit, P.C. Dauby, J. Colloid Interface Sci. 283 (2) (2005) 522-532] that considered a Biot number depending on the wavenumber evaluated at the threshold is performed. Very good agreement is found between both models. For this reason, the present analysis can also be considered as a detailed theoretical justification for the use of a one-sided model in the study of evaporative thermoconvection. [less ▲]

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See detailApproches des phénomènes chaotiques
Dauby, Pierre ULg

Learning material (2005)

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See detailWeakly nonlinear study of Marangoni instabilities in an evaporating liquid layer
Dondlinger, Mireille; Margerit, Jonathan; Dauby, Pierre ULg

in Journal of Colloid & Interface Science (2005), 283(2), 522-532

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See detailStabilité thermomagnétoconvective d'un ferrofluide dans une couche poreuse en rotation
Desaive, Thomas ULg; Hennenberg, Marcel; Dauby, Pierre ULg

in Mécanique & Industries (2004), 5(5),

Detailed reference viewed: 22 (4 ULg)