Laminar burning velocities and flammability limits of premixed methane/air flames in the presence of various inert gases including helium, argon, nitrogen and carbon dioxide were investigated by combined use of microgravity experiments and computations. The experiments used a short-drop free-fall laboratory facility that can eliminate the effect of buoyancy on flames and therefore enable accura...

Ignition and combustion of an initially spherical pocket of fuel in motion relative to a hot oxidizing atmosphere is studied. The model considers finite rate chemistry represented by an irreversible one-step reaction. Attention is focused on the development of the ignition process, which, in the end, typically leads to the establishment of a diffusion flame. For moderate values of a suitably de...

This study compares liquid fuel combustion characteristics of biofuels derived from camelina (POSF6152) and tallow (POSF6308) with a US domestic aviation fuel (Jet-A, POSF4658) using the spherically symmetric (one-dimensional) droplet flame configuration as the basis of comparison. A blend of camelina biofuel and Jet-A is also examined. The initial droplet diameters were fixed at 0.57 ± 0.03 mm...

Effects of chemically-passive fire suppressants on laminar premixed hydrogen flames were investigated by combined use of microgravity experiments and computations. The experiments used a short-drop freefall laboratory facility that provides at least 450 ms of 10 2 g. Near-limit laminar burning velocities were measured for outwardly propagating spherical stoichiometric hydrogen-air flames with v...

There are many assumptions that have been considered when describing black liquor droplet combustion. These include assuming an isothermal particle, a constant diameter particle, inert inorganic species, and one-film diffusion model. This paper shows the effects of systematically relaxing these factors for a 1-D spherical model for black liquor combustion. The flame is described using boundary ...

Tissue engineering scaffolds are highly engineered structures that accommodate cells, facilitate their expression, and resorb to facilitate regeneration of tissue. A new technique for producing controlled pore shape and pore size interconnectivity offers promise for application as a tissue engineering scaffold. Salt particles were spheroidized in a flame and sintered to provide an interconnecti...