Browsing by Author "Visser, Ernest Jay"

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Development and evaluation of a two-dimensional microscale transport and biofilm process model
(Montana State University - Bozeman, College of Engineering, 1998) Visser, Ernest Jay
Evaluation of a coupled mass transport-biofilm process model using dissolved oxygen microsensors
(1995) Cunningham, Alfred B.; Visser, Ernest Jay; Lewandowski, Zbigniew; Abrahamson, Michael T.
A 2-dimensional model has been developed which couples hydrodynamics, solute transport and reaction in a steady state biofilm system of irregular geometry under laminar flow. Biofilm thickness is initially specified over the domain and remains constant during the simulations. The Navier-Stokes equations are coupled with advection-diffusion-reaction equations describing oxygen transport and solved using finite differences. This model facilitates computational investigation of fluid velocity and solute concentration distributions in proximity to the fluid-biofilm interface. Model evaluation has been carried out using dissolved oxygen profiles measured by microsensors in a rectangular open channel with a 300 μm (approximate) artificial biofilm composed of alginate gel with an 8×1010 cells/ml concentration of Ps. aeruginosa cells. Significant variability in dissolved oxygen profile shape was observed at three locations on the artificial biofilm. Model simulations of these experiments facilitated a direct comparison between observed and computed values of dissolved oxygen concentration in the vicinity of the fluid-biofilm interface. Simulated profiles agreed closely with measured profiles at all three locations.
Numerical simulation of biofilm growth in porous media at the microscale
(1996) Chen, Binbin; Cunningham, Alfred B.; Visser, Ernest Jay
Two-dimensional modeling of microscale transport and biotransformation in porous media
(1994-01) Chen, Binbin; Cunningham, Alfred B.; Ewing, R.; Peralta, R.; Visser, Ernest Jay
We develop a model for simulating the growth of a biofilm in a tortuous tube. The solutions to the Navier-Stokes equations and the advection-diffusion equation are calculated numerically using finite differences. These solutions are then coupled with a biofilm growth model.