DOI: 10.1016/j.watres.2018.08.070
Scopus记录号: 2-s2.0-85053008885
论文题名: Determination of mechanical properties of biofilms by modelling the deformation measured using optical coherence tomography
作者: Picioreanu C. ; Blauert F. ; Horn H. ; Wagner M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 588
结束页码: 598
语种: 英语
英文关键词: Biofilm mechanics
; Elastic modulus
; Fluid-structure interaction
; Imaging
; Poroelastic model
Scopus关键词: Deformation
; Elastic moduli
; Flow velocity
; Fluid structure interaction
; Geometry
; Imaging techniques
; Mechanical properties
; Optical tomography
; Shear stress
; Viscoelasticity
; Biofilm elastic modulus
; Fluid structure interaction computations
; Hydrodynamic loading
; Non-invasive imaging
; Poroelastic model
; Rectangular channel
; Simplifying assumptions
; Viscoelastic properties
; Biofilms
; biofilm
; computational fluid dynamics
; elastic modulus
; elastic property
; flow velocity
; fluid-structure interaction
; imaging method
; mechanical property
; modeling
; numerical model
; optical property
; seismic tomography
; shear stress
; two-dimensional modeling
; Young modulus
; article
; biofilm
; controlled study
; flow rate
; geometry
; hydrodynamics
; optical coherence tomography
; prediction
; relaxation time
; shear stress
; simulation
; Young modulus
; Equus asinus
英文摘要: The advantage of using non-invasive imaging such as optical coherence tomography (OCT) to asses material properties from deformed biofilm geometries can be compromised by the assumptions made on fluid forces acting on the biofilm. This study developed a method for the determination of elastic properties of biofilms by modelling the biofilm deformation recorded by OCT imaging with poroelastic fluid-structure interaction computations. Two-dimensional biofilm geometries were extracted from OCT scans of non-deformed and deformed structures as a result of hydrodynamic loading. The biofilm geometries were implemented in a model coupling fluid dynamics with elastic solid mechanics and Darcy flow in the biofilm. The simulation results were compared with real deformed geometries and a fitting procedure allowed estimation of the Young's modulus in given flow conditions. The present method considerably improves the estimation of elastic moduli of biofilms grown in mini-fluidic rectangular channels. This superior prediction is based on the relaxation of several simplifying assumptions made in past studies: shear stress is not anymore taken constant over the biofilm surface, total stress including also pressure is accounted for, any biofilm shape can be used in the determinations, and non-linear behavior of mechanical properties can be estimated. Biofilm elastic moduli between 70 and 700 Pa were obtained and biofilm hardening at large applied stress due to increasing flow velocity was quantified. The work performed here opens the way for in-situ determination of other mechanical properties (e.g., viscoelastic properties, relaxation times, plastic yields) and provides data for modelling biofilm deformation and detachment with eventual applications in biofilm control and removal strategies. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112417
Appears in Collections: 气候减缓与适应
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作者单位: Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Delft, Netherlands; Water Chemistry and Water Technology, Engler-Bunte-Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany
Recommended Citation:
Picioreanu C.,Blauert F.,Horn H.,et al. Determination of mechanical properties of biofilms by modelling the deformation measured using optical coherence tomography[J]. Water Research,2018-01-01,145