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Energy densities of different sources. The energy density of combustion-based sources is based on complete combustion to carbon dioxide and liquid water, at 298 K and 1 atm.
Source publication
The flow physics controlling the stabilization and propagation of a methane/air laminar premixed flame in a narrow channel is revisited from numerical simulations. Combustion is described with complex chemistry and transport properties, along with a coupled simulation of heat transfer at and within the wall. First, a chemistry mechanism reduction p...
Contexts in source publication
Context 1
... battery technology often results in power pply systems that are too heavy, do not last long enough, or both. The interest in microcombustion-based devices can be attribed to the high volumetric and gravimetric energy density of drocarbons, which is a couple of orders of magnitude higher than at of lithium ion batteries, as shown in Table 1. In order to be mmercially viable alternatives to batteries in the 1e100 W range, more representative comparison should consider the entire mbustion-based power generation system and the weight of the vice and auxiliary units, rather than just the fuel density [5]. ...Context 2
... in small-scale configurations, the increase of the surface to volume ratio reinforces the role of surface reactions both by increasing the wall temperature and by forcing a closer cohabitation between the wall and the flame. Table 1.1 gives an example of reactions typical of this process for methane/air combustion. As explained by Raimondeau et al. [121], the sticking coefficients of the Langmuir-Hinshelwood mechanisms describes the probability of a colliding molecule to stick to the surface and the probability of a radical to meet an empty active wall site. ...Context 3
... is, the important radicals for ignition and extinction are quenched out by adsorbing them on the surface and allowing them to recombine to form stable gas-phase species that desorb into the fluid phase. Table 1 shows the heterogeneous (surface) reactions we consider in simulating radical quenching along with the corresponding kinetic parameters. Previous work [17] has shown through sensitivity analysis that the radicals depicted in Table 1 are the most important for flame ignition and extinction. ...Context 4
... 1 shows the heterogeneous (surface) reactions we consider in simulating radical quenching along with the corresponding kinetic parameters. Previous work [17] has shown through sensitivity analysis that the radicals depicted in Table 1 are the most important for flame ignition and extinction. The sticking coefficients of the adsorption steps are varied from zero to one to simulate walls having different radical quenching affinity. ...Context 5
... battery technology often results in power pply systems that are too heavy, do not last long enough, or both. The interest in microcombustion-based devices can be attribed to the high volumetric and gravimetric energy density of drocarbons, which is a couple of orders of magnitude higher than at of lithium ion batteries, as shown in Table 1. In order to be mmercially viable alternatives to batteries in the 1e100 W range, more representative comparison should consider the entire mbustion-based power generation system and the weight of the vice and auxiliary units, rather than just the fuel density [5]. ...Context 6
... in small-scale configurations, the increase of the surface to volume ratio reinforces the role of surface reactions both by increasing the wall temperature and by forcing a closer cohabitation between the wall and the flame. Table 1.1 gives an example of reactions typical of this process for methane/air combustion. As explained by Raimondeau et al. [121], the sticking coefficients of the Langmuir-Hinshelwood mechanisms describes the probability of a colliding molecule to stick to the surface and the probability of a radical to meet an empty active wall site. ...Context 7
... is, the important radicals for ignition and extinction are quenched out by adsorbing them on the surface and allowing them to recombine to form stable gas-phase species that desorb into the fluid phase. Table 1 shows the heterogeneous (surface) reactions we consider in simulating radical quenching along with the corresponding kinetic parameters. Previous work [17] has shown through sensitivity analysis that the radicals depicted in Table 1 are the most important for flame ignition and extinction. ...Context 8
... 1 shows the heterogeneous (surface) reactions we consider in simulating radical quenching along with the corresponding kinetic parameters. Previous work [17] has shown through sensitivity analysis that the radicals depicted in Table 1 are the most important for flame ignition and extinction. The sticking coefficients of the adsorption steps are varied from zero to one to simulate walls having different radical quenching affinity. ...