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Author (up) Tierra, G.; Pavissich, J.P.; Nerenberg, R.; Xu, Z.L.; Alber, M.S. pdf  doi
  Title Multicomponent model of deformation and detachment of a biofilm under fluid flow Type
  Year 2015 Publication Journal of the Royal Society Interface Abbreviated Journal J. R. Soc. Interface  
  Volume 12 Issue 106 Pages 13 pp  
  Keywords biofilm; viscoelasticity; detachment; phase-field model; energetic variation; continuum mechanics  
  Abstract A novel biofilm model is described which systemically couples bacteria, extracellular polymeric substances (EPS) and solvent phases in biofilm. This enables the study of contributions of rheology of individual phases to deformation of biofilm in response to fluid flow as well as interactions between different phases. The model, which is based on first and second laws of thermodynamics, is derived using an energetic variational approach and phase-field method. Phase-field coupling is used to model structural changes of a biofilm. A newly developed unconditionally energy-stable numerical splitting scheme is implemented for computing the numerical solution of the model efficiently. Model simulations predict biofilm cohesive failure for the flow velocity between O(10(-3)) and O(10(-2))ms(-1) which is consistent with experiments. Simulations predict biofilm deformation resulting in the formation of streamers for EPS exhibiting a viscous-dominated mechanical response and the viscosity of EPS being less than O(10) kgm(-1) s(-1). Higher EPS viscosity provides biofilm with greater resistance to deformation and to removal by the flow. Moreover, simulations show that higher EPS elasticity yields the formation of streamers with complex geometries that are more prone to detachment. These model predictions are shown to be in qualitative agreement with experimental observations.  
  Address [Tierra, Giordano] Charles Univ Prague, Fac Math & Phys, Math Inst, Prague 18675 8, Czech Republic, Email:  
  Corporate Author Thesis  
  Publisher Royal Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1742-5689 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000353359900017 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 484  
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