WITHDRAWN: Effects of different factors on the heat conduction properties of micro-structured homogeneous combustion systems

Abstract

In addition to chemical reactions, physical processes that transfer mass and energy by diffusion or convection occur in gaseous combustion. While flame propagation at the micro-scale is feasible, the interplay of kinetics and transport in flame stability and combustion characteristics of micro-structured homogeneous combustion systems is poorly understood. This study relates to the effects of different factors on the heat conduction properties of micro-structured homogeneous combustion systems. Computational fluid dynamics simulations are conducted by treating explicitly heat transfer through the wall. to gain insights into combustion performance such as species concentrations, temperatures, and flames. The effects of materials of construction and operating conditions on flame stability and combustion characteristics are delineated. The factors affecting combustion characteristics are determined for micro-structured homogeneous combustion systems. Particular focus is placed on determining essential factors that affect the performance of micro-structured homogeneous combustion systems. The results indicate that the wall thermal conductivity is very important as this design parameter determines the upstream heat transfer, which is necessary for flame ignition and stability, and the material's integrity by controlling the existence of hot spots. The wall thermal conductivity is vital in determining the flame stability of the system, as the walls are responsible for the majority of the upstream heat transfer as well as the external heat losses. Further improvement in flame stability can be achieved by using anisotropic walls. The combustion system walls should have anisotropic thermal conductivity; they should allow axial but inhibit transverse conduction. Such anisotropic walls would allow upstream heat flux to preheat the feed, yet not allow transverse heat loss to the surroundings.