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DY: Fachverband Dynamik und Statistische Physik

DY 44: Modelling and Simulation of Soft Matter II (joint session CPP/DY)

DY 44.5: Vortrag

Mittwoch, 18. März 2020, 16:00–16:15, ZEU 255

Analytical and computational study of advection-diffusion-reaction processes in catalytic fibrous membranes — •Gabriel Sitaru and Stephan Gekle — Biofluid Simulation and Modeling, Theoretische Physik VI, Universität Bayreuth

We investigate the efficiency of multi-step catalytic systems where a reactant species is flown through a set of fibrous catalytic membranes. The complexity of such systems arises from the interplay of three different time scales: advection, diffusion and reaction. A theory based on infinitely long cylindrical catalytic sites is developed for the steady-state of an advection-diffusion limited reaction. Additionally, the time-dependent concentration profiles are computed using a Lattice-Boltzmann based solver for both the advection-diffusion-reaction and the Navier-Stokes equations. The comparison shows a good agreement between the theory and the numerical results, our model breaking down only in the very low-Péclet regime (i.e. diffusive flow). Both methods can be easily used to predict the efficiency of a multi-step catalysis in fibrous membranes with various geometries.