Understanding flow through catalytic converters

Abstract

In this experiment the fluid flow behaviour through an automotive catalytic converter has been studied empirically and computationally. A CFD model utilizing the k-ω turbulence model and porous media approach was developed to simulate the flow through the monolithic ceramic substrate. The flow properties for the ceramic monolith were obtained using a 3D single channel approach. CFD analysis was validated by flow experiments with non-reacting flow using high temperature air. The local velocity and temperature profiles for inlet Reynolds Number of 43,000 were measured using hot-wire and high sensitivity thermocouple sensors. The CFD results were found to predict the experimental measurements with an average root mean square error of ±8%. The present analysis is considered to be a key step towards understanding the flow behaviour through catalytic converters that can help in achieving better design of the exhaust system.