Characterize the effect of particle surface morphology on ignition

Characterize how the irregular, porous, or otherwise non-spherical surface morphology of the iron particles used in the jet-in-hot-coflow burner affects particle ignition characteristics and oxidation degree, relative to the spherical, non-porous particle representation used in the simulations.

Background

The numerical model represents iron particles as spherical and non-porous, whereas the particles in the referenced experiments are reported to be irregularly shaped. Surface morphology can alter the area available for reaction and heat transfer and can therefore change ignition behavior and oxidation degree. The authors identify particle morphology as an unresolved feature that may explain part of the discrepancy between simulated and measured oxidation.

References

The particles are assumed to be spherical and non-porous in the simulations, while the actual particles used in the experiments might have a more complex morphology, which can affect the ignition characteristics.

— LES of iron-powder combustion in a jet-in-hot-coflow burner - Insights on flame structure and ignition characteristics  (2608.28294 - Hemamalini et al., 28 Aug 2026) in Section 3.2, subsection “Discrepancy in oxidation degree”