April 17, 2013: New Directions in Advanced Modeling and In Situ Measurements Near Reacting Surfaces





Date:           Wednesday, 17 April 2013
Time:           04.15 pm
Location:    Maschinenlaboratorium ETH Zurich 
 ML H 44




PD Dr. Ioannis Mantzaras
Combustion Fundamentals Group, Combustion Research Laboratory

Paul Scherrer Institute, Villigen, Switzerland




Multidimensional numerical modeling and in situ spatially resolved measurements of gas phase thermoscalars over the catalyst boundary layer have fostered fundamental investigation of the heterogeneous and homogeneous chemical reaction pathways and their coupling at industrially relevant operating conditions. The methodology for validat-ing catalytic and gas phase reaction mechanisms is firstly outlined for various practical fuels. Combination of advanced modeling and in situ near wall species and velocity measurements is then used to address the intricate interplay between interphase fluid transport (laminar or turbulent) and hetero-/homogeneous kinetics. Controlling parame-ters of this interplay are the homogeneous ignition chemistry, flame propagation char-acteristics, competition between the catalytic and gaseous pathways for fuel consump-tion, diffusional imbalance of the limiting reactant, flow laminarization due to heat transfer from the catalytic walls, and fuel leakage through the gaseous combustion zone. Transient reactor modeling and intrinsic flame dynamics driven by interactions between homogeneous chemistry and catalytic walls are presented using detailed tran-sient simulation in channel geometries. It is shown that the presence of catalytic reac-tions moderates homogeneous driven instabilities. Future directions in transient model-ing and in temporally resolved in situ near wall measurements are finally outlined.



Host: Prof. K. Boulouchos