Interaction between heterogeneous and homogeneous reaction of premixed hydrogen–air mixture in a planar catalytic micro-combustor

Abstract

Hetero-/homogeneous combustion of hydrogen-air mixture in a platinum-coated micro channel was studied by means of three-dimensional (3D) Computational Fluid Dynamics (CFD) model using detailed reaction mechanisms for homogeneous (gas phase) and heterogeneous (catalytic) reactions.The influence of heterogeneous reaction on homogeneous reaction was obtained by discussing the hetero-/homogeneous reaction characteristics, the process and competitiveness of heterogeneous reaction. Intense depletion of fuel and product formation near the inlet has shown that fuel absorption reaction was predominant whiles there was no homogeneous reaction. The free radicals from homogeneous reaction near the catalytic surface were drained, resulting in the interruption of chain reaction. The desorbed product as the third-body promoted the chain terminating reaction to deactivate free radical. The competitiveness value of heterogeneous reaction for capturing fuel was 14.85%, indicating a weak reaction intensity in the catalytic combustor. The heterogeneous reaction presented an inhibition effect on homogeneous reaction but greatly enhanced the combustion efficiency in the micro channel.

Reaction kinetics of basaltic elements in cementitious matrices: theoretical considerations

“…The solid substance, shape of elements or non-fluid attribute of the systems allows some simplifications to be adopted. This basically excludes CFD models that are too excessive, so suitable for applications in more complex problem solutions [3][4].…”

“…To achieve precise and reliable results, however, it is important to use an appropriate mathematical model being completed with suitable experimental methods for the corrosion processes monitoring to create a complex methodology. Since there are various models described in the literature, having different demands on input data or computing power [3,4] while producing outputs of various accuracy, this paper summarizes and evaluates the available models and techniques, pointing out their advantages/disadvantage in the light of potential application in basaltic elements reactions when exposed to alkaline environment.…”

Melting Heat Transfer in Thermally Stratified Magnetohydrodynamic Flow of Eyring-Powell Fluid with Homogeneous-heterogeneous Reaction

“…An exclusive analysis for the flow of carbon nanotubes with chemical species is given by Hayat et al [5]. Lu et al [6] interrogated the interactive relation of heterogeneous-homogeneous reaction of air and hydrogen mixture.…”