Jundika C. Kurnia

Potential catalyst savings in heterogeneous gaseous spiral coiled reactor utilizing selective wall coating – A computational study

Abstract This study numerically evaluates the effect of secondary flow on the reaction performance in heterogeneous gaseous spiral coiled reactor utilizing selective wall coatings. Laminar multispecies gas flow in spiral coiled reactor with circular and square cross-section is investigated using a validated three-dimensional computational fluid dynamics (CFD) model. Various selective wall coating strategies are evaluated within a range of Reynolds number. The reactor performance is measured not only based on the conversion rate but also in terms of figure of merit (FoM) defined as reaction throughput per unit pumping power and catalyst coating active area. The results indicate that secondary flow enhance reaction performance and improve catalyst utilization, especially at the outer wall. By maximizing this effect, the requirement of expensive catalyst materials can be minimized. This study highlight the potential of selective catalyst coating in coiled reactor for process intensification and cost reduction in various applications.

A three-dimensional computational model of H2-air premixed combustion in a circular micro-channel for thermo-photovoltaic (TPV) application

This study investigates the flow characteristics of a reacting flow of H2-air mixture inside a circular microchannel with sudden expansion (backward facing step). Different steady state Reynolds Average Numerical Simulation (RANS) turbulence models alongside with different reaction rate formulations are evaluated to achieve quantitative agreement with the published experimental data. The effect of inlet velocity on overall flame structure and outer wall temperature has also been investigated. The results indicate that Reynolds Stress Model (RSM) with Eddy Dissipation Concept (EDC) provide the best quantitative prediction. In addition, it is found that increase in inlet velocity results in an elevated wall temperature.