Mass Transfer Related to Heterogeneous Combustion of Solid Carbon in the Forward Stagnation Region - Part 1 - Combustion Rate and Flame Structure

Combustion Rate of Solid Carbon in the Axisymmetric Stagnation Flowfield Established over a Sphere and/or a Flat Plate

“…Third, an attempt is made to identify effects of thermophysical properties, as well as other kinetic and system parameters involved. Note here, however, that explanations cannot help but be similar to those in the previous work [15] because the formulation of the carbon combustion in the stagnation flowfield has been constructed in a generalized manner, regardless of the flow configuration, whether it is axisymmetric or twodimensional.…”

“…(1) The quantities F and O in the reaction rate g in (15) become zero, suggesting that fuel and oxygen do not coexist throughout the boundary layer and that the diffusion flame becomes a flame sheet. (2) In the limit of an infinitesimally thin reaction zone, by conducting an integration of the coupling function for CO and O 2 across the zone, bounded between f− < < f+ , where f is the location of flame sheet, we have…”

“…Predicted results by use of the explicit combustion-rate expressions are also shown in Figure 8 as a function of the surface temperature, with the H 2 O mass-fraction A,∞ taken as a parameter. In this prediction, use has been made of the surface kinetic parameters described in the previous works [15,42,65] . This is due to the fact that the type of artificial graphite of their test specimens is exactly the same as that in the previous works.…”

“…It has even been said that mathematical analyses, experimental data acquisition, and physical interpretations have been facilitated by its introduction. Since carbon combustion in the two-dimensional stagnation flow, established over a cylinder, has already been summarized somewhere in a set of review papers [15,16], in which extensive comparisons have been conducted between experimental and theoretical/numerical results, here we confine ourselves to studying carbon combustion in the axisymmetric stagnation flow over a sphere or a flat plate, by comparing experimental data in the literature with theoretical/numerical results, newly obtained. From the practical point of view, we can even say that it simulates the situations of ablative carbon heat-shields and/or the strongly convective carbon burning in the forward stagnation region of a particle.…”

Multidimensional Reacting Flow Simulation with Coupled Homogeneous and Heterogeneous Models

“…collision frequency and activation energy) by measuring carbon mass loss rates. The results of such studies can be seen in reviews [26,27] and recent works [20,28,29]. These studies show that surface temperatures and fluid dynamics affect reacting layers, which is supported by other works, such as Refs.…”