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UID:0-895@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20231103T100000
DTEND;TZID=Europe/Paris:20231103T150000
DTSTAMP:20231025T064740Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/soutenance-feder
 ico-lanza/
SUMMARY:Soutenance de thèse: Federico Lanza - LPTMS (100% online seminar) 
 - 3 Nov 23 10:00
DESCRIPTION:Optimal path for the flow of yield stress fluid Federico Lanza
  (LPTMS - NTNU)   Numerous industrial and environmental applications rel
 y on an understanding of fluid behavior within porous materials\, from rem
 ediating groundwater contamination to carbon dioxide storage. Yield stress
  fluids\, which resist flow until a critical stress threshold is exceeded\
 , present both unique challenges and opportunities. Capillary forces\, res
 ponsible for separating immiscible fluids\, significantly influence multi-
 phase flow in porous structures. This thesis embarks on a theoretical expl
 oration of non-linear flow within porous media\, where both forces contrib
 ute to the overall rheology\, interacting with the geometrical disorder at
  the pore level. The present study investigates the steady-state flow of y
 ield stress blobs in a capillary fiber bundle filled with Newtonian liquid
 \, as well as the flow of a single Bingham fluid in a tree-like pore netwo
 rk. We derive expressions for the pressure threshold and the average flow 
 rate as a function of the applied pressure drop. In both problems\, the no
 n-linearity observed stems from the sequential opening of flowing paths wi
 th increasing pressure drop\, and the distribution of pressure thresholds 
 related to these paths defines the specific flow rate law. Furthermore\, w
 e explore the transition from viscous fingering to foam during immiscible 
 drainage in a two-dimensional porous medium. We characterize this transiti
 on through numerical simulations using a dynamic pore network model\, meas
 uring the transition location\, overall flow rate\, and local pressure gra
 dient as a function of imposed global pressure and viscosity ratio. We dis
 cuss potential mechanisms leading to this transition\, considering local f
 low rate fluctuations\, which we also measure and characterize. In all thr
 ee cases studied\, the porous medium's heterogeneity emerges as a pivotal 
 factor.Jury : Harold Auradou\, Dag Werner Breiby\, Alex Hansen\, Rainer He
 lmig\, Hans Herrmann\, Marie-Laure Olivier\, Alberto RossoNTNU\, Salle C20
 1\, Kolbjørn Hejes vei 1B\, 7034 Trondheim\, Norway
CATEGORIES:seminars
LOCATION:LPTMS (100% online seminar)\, LPTMS - Bâtiment Pascal n° 530 rue
  André Rivière - Université Paris-Saclay\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=LPTMS - Bâtiment Pascal n
 ° 530 rue André Rivière - Université Paris-Saclay\, Orsay\, 91405\, Fr
 ance;X-APPLE-RADIUS=100;X-TITLE=LPTMS (100% online seminar):geo:0,0
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