Séminaires

Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).

Contact :
Laurent Duchemin
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22


Séminaire PMMH - Alex Hansen (NTNU Norvège)

Vendredi 29 mars de 11h00 à 12h00 - Salle réunion PMMH 1

Séminaire d'Alex Hansen (NTNU, Trondheim, Norvège)

The co-moving velocity, a new concept in immiscible two-phase flow in porous media

Alex Hansen
PoreLab, Department of Physics, NTNU, Trondheim, Norway

Since 1936, relative permeability theory has been the leading description of immiscible two-phase flow in porous media at scales much larger than the pore scale. Central to this theory are the two relative permeabilities, one for each fluid, which measures the reduction of mobility each fluid experiences due to the presence of the other fluid. The theory assumes the two relative permeabilities to be functions of the saturation (i.e., relative concentration) alone. When there are saturation gradients present, a third parameter comes into play, the capillary pressure. This is also assumed to depend on the saturation alone.

Such a theory is clearly quite limited in that it makes many strong assumptions. Yet, it is essentially the only one that is used for practical calculations. Can one do better ? That is, come up with a theory that is closer to the physics that is going on and at the same does not drown in complexity ? My answer is yes [1-7]. The aim of this talk is to describe this new theory. I will focus on a new velocity that pops up, namely the co-moving velocity. This velocity has remarkable properties that hints at something deeper which is yet to be uncovered.

References

[1] A. Hansen, S. Sinha, D. Bedeaux, S. Kjelstrup, M. Aa. Gjennestad and M. Vassvik, Relations between seepage velocities in two-phase flow in homogeneous porous media, Transp. Porous Med. 125, 565 (2018) ; doi:10.1007/s11242-018-1139-6.

[2] S. Roy, S. Sinha, and A. Hansen, Flow-area relations in immiscible two-phase flow in porous media, Front. Phys. 8, 4 (2020) ; doi:10.3389/fphy.2020.00004.

[3] S. Roy, H. Pedersen, S. Sinha, and A. Hansen, The co-moving velocity in immiscible two-phase flow in porous media, Transp. in Porous Media, 143, 69 (2022) ; doi:10.1007/s11242-022-01783-7.

[4] A. Hansen, E. G. Flekkøy, S. Sinha, and P. A. Slotte, A statistical mechanics for immiscible and incompressible two-phase flow in porous media, Adv. Water Res., 171, 104336 (2023) ; doi:10.1016/j.advwatres.2022.104336.

[5] H. Pedersen and A. Hansen, Parametrizations of immiscible two-phase flow in porous media, Front. Phys. 11, 1127345 (2023) ; doi:10.3389/fphy.2023.1127345.

[6] F. Alzubaidi, J. E. McClure, H. Pedersen, A. Hansen, C. F. Berg, P. Mostaghimi and R. T. Armstrong, The impact of wettability on the co-moving velocity of two-fluid flow in porous media, arXiv:2309.0036.

[7] J. Feder, E. G. Flekkøy, and A. Hansen, Physics of Flow in Porous Media, (Cambridge University Press, 2022).

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Séminaires  (6)

  • Séminaire PMMH - Jacques Fattaccioli (PASTEUR, ENS)
    Vendredi 15 mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Bacteria on high fat diets cooperate to stay fit
    During the consumption of alkanes, Alcanivorax borkumensis, a bacteria commonly found in oil spill areas, form a biofilm around oil droplets to consume them. The role this plays during degradation remains unclear. Using in-situ microfluidic tracking, we identify a shift in biofilm morphology that depends on (...)
  • Séminaire PMMH - Dominic Vella (University of Oxford)
    Vendredi 22 mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Drops with deformable boundaries : Flat tops, Locomotion and Ageing
    A liquid droplet placed on a rigid, planar surface has a captivating simplicity : its surface is a spherical cap and remains in equilibrium. In this talk, I'll show that the addition of a deformable boundary leads to a range of new phenomena : evaporating droplets with an elastic skin may develop flat tops, while (...)
  • Séminaire PMMH - Alex Hansen (NTNU Norvège)
    Vendredi 29 mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Séminaire d'Alex Hansen (NTNU, Trondheim, Norvège)
    The co-moving velocity, a new concept in immiscible two-phase flow in porous media Alex Hansen PoreLab, Department of Physics, NTNU, Trondheim, Norway Since 1936, relative permeability theory has been the leading description of immiscible two-phase flow in porous media at scales much larger than the pore scale. (...)
  • Séminaire PMMH - Olivier Plé (LOCIE-CNRS)
    Vendredi 5 avril de 11h00 à 12h00 - Salle réunion PMMH 1
    Rammed earth : A complex medium
    Rammed earth is a complex material which is attractive nowadays in construction because of its small environmental footprint. However, this material has specific characteristics, especially : its sensitivity to water, its low mechanical static capacity but a fairly good seismic performance, its high thermal (...)
  • Séminaire PMMH - Benjamin Guiselin - ENS Lyon
    Vendredi 12 avril de 11h00 à 12h00 - Salle réunion PMMH 1
    Emergence of spontaneous collective oscillations in dense Human crowds
    Massive crowd gatherings form some of the most dangerous and unpredictable environments [1]. However, we lack quantitative characterizations of their dynamics and the heuristic principles used to explain and predict their motion remain elusive. In this talk, I will present our analysis of the dynamics of thousands (...)
  • Séminaire PMMH - Benjamin Guiselin - ENS Lyon
    Vendredi 12 avril de 11h00 à 12h00 - Salle réunion PMMH 1
    Emergence of spontaneous collective oscillations in dense Human crowds
    Massive crowd gatherings form some of the most dangerous and unpredictable environments [1]. However, we lack quantitative characterizations of their dynamics and the heuristic principles used to explain and predict their motion remain elusive. In this talk, I will present our analysis of the dynamics of thousands (...)

Instructions générales pour les conférenciers

Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.

Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.

Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.

Lien vers séminaires café (internes, tous les jeudis)


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Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr