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Liquid plug formation in an airway closure model

Article dans une revue avec comité de lecture
Auteur
ROMANÒ, Francesco
531216 Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet [LMFL]
FUJIOKA, H.
424938 Tulane University
MURADOGLU, M.
490017 Koç University
GROTBERG, J. B.
24332 University of Michigan [Ann Arbor]

URI
http://hdl.handle.net/10985/17695
DOI
10.1103/physrevfluids.4.093103
Date
2019
Journal
Physical Review Fluids

Résumé

The closure of a human lung airway is modeled as an instability of a two-phase flow in a pipe coated internally with a Newtonian liquid. For a thick enough coating, the Plateau-Rayleigh instability creates a liquid plug which blocks the airway, halting distal gas exchange. Owing to a bifrontal plug growth, this airway closure flow induces high stress levels on the wall, which is the location of airway epithelial cells. A parametric numerical study is carried out simulating relevant conditions for human lungs, in either ordinary or pathological situations. Our simulations can represent the physical process from pre- to postcoalescence phases. Previous studies have been limited to precoalescence only. The topological change during coalescence induces a high level of stress and stress gradients on the epithelial cells, which are large enough to damage them, causing sublethal or lethal responses. We find that postcoalescence wall stresses can be in the range of 300% to 600% greater than precoalescence values and so introduce an important source of mechanical perturbation to the cells.

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Documents liés

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  • Splitting of a three-dimensional liquid plug at an airway bifurcation 
    Article dans une revue avec comité de lecture
    FUJIOKA, Hideki; ccROMANO, Francesco; MURADOGLU, Metin; GROTBERG, James B. (AIP Publishing, 2022-08)
    Employing the moving particles' semi-implicit (MPS) method, this study presents a numerical framework for solving the Navier–Stokes equations for the propagation and the split of a liquid plug through a three-dimensional ...
  • The effect of viscoelasticity in an airway closure model 
    Article dans une revue avec comité de lecture
    ccROMANO, Francesco; MURADOGLU, M.; FUJIOKA, H.; GROTBERG, J.B. (Cambridge University Press (CUP), 2021-02)
    Abstract
  • Capillary instability of a two-layer annular film: an airway closure model 
    Article dans une revue avec comité de lecture
    ERKEN, O.; ccROMANO, Francesco; GROTBERG, J.B.; MURADOGLU, M. (Cambridge University Press (CUP), 2022-01)
    Capillary instability of a two-layer liquid film lining a rigid tube is studied computationally as a model for liquid plug formation and closure of human airways. The two-layer liquid consists of a serous layer, also called ...
  • Propagation and rupture of elastoviscoplastic liquid plugs in airway reopening model 
    Article dans une revue avec comité de lecture
    BAHRANI, S. Amir; ccHAMIDOUCHE, Souria; ccMOAZZEN, Masoud; SECK, Khady; DUC, Caroline; MURADOGLU, Metin; GROTBERG, James B.; ccROMANO, Francesco (Elsevier BV, 2022-02)
    The propagation and rupture of mucus plugs in human lungs is investigated experimentally by injecting synthetic mucus in a pre-wetted capillary tube. The rheology of our test liquid is thoroughly characterized, and four ...
  • Effects of elastoviscoplastic properties of mucus on airway closure in healthy and pathological conditions 
    Article dans une revue avec comité de lecture
    ERKEN, O.; FAZLA, B.; MURADOGLU, M.; IZBASSAROV, D.; ccROMANO, Francesco; GROTBERG, J. B. (American Physical Society (APS), 2023-05)
    Airway mucus is a complex material with both viscoelastic and viscoplastic properties that vary with healthy and pathological conditions of the lung. In this study, the effects of these conditions on airway closure are ...

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