Investigating the Impact of Different Topologies on Performance of Catalytic Converters

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Sadeghi, Mohammad Amin | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47284 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Kariminia, Hamid Reza; Abdekhodaie, Mohammad Jafar
Abstract:
Due to their enormous CO/〖NO〗_x removal capabilitiy, catalytic converters are deemed as indispensable parts of modern vehicles. These converters are comprised of a bundle of parallel tubes which their internal walls are wash-coated with a catalyst such as platinum or rhodium. The typical geometry for the tubes’ cross-section is honeycomb. In this project, the effect of tube cross-section geometry on CO/〖NO〗_x removal performance of catalytic converters is studied. In this respect, a three-dimensional model consisted of incompressible flow, advection-diffusion, and surface reaction was developed. Candidate geometries were triangle, square, honeycomb, and circle. The results show that as the geometry of the tube cross-section converges to a whole circle, the removal efficiency of the converter is reduced. Consequently, catalytic converters with triangular cell cross-section are the most efficient in terms of CO/〖NO〗_x removal, although they show higher pressure drop. Afterwards, the effect of important factors – channel diameter and inlet velocity – on removal efficiency as well as pressure drop was studied
Keywords:
Simulation ; Numerical Solution ; Catalytic Converters ; Topology ; Channel Geomettry

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