At redshift z ∼ > 5 Type II supernovae (SNII) are the only known dust sources with evolutionary timescales shorter than the Hubble time. We extend the model of dust formation in the ejecta of SNII by Todini & Ferrara (2001) to investigate the same process in pair-instability supernovae (SNγγ), which are though to arise from the explosion of the first, metal free, very massive (140-260 M⊙) stars...

The flame propagation through a coal dust-air mixture in a spherical vessel was studied by means of a one-dimensional, Arrhenius-type kinetics and quasi-steady model. The model includes the evaporation of the volatile matter of dust particles into a known gaseous fuel (methane) and the single-stage reaction of the gas-phase combustion. Effect of venting devices as safety idea and the radiation ...

The present paper reports on the experimental and theoretical investigations on the lower explosion limits of single dusts, gases as well of two phase mixtures such as gas/dust, vapor/dust, spray/vapor and vapor/gas. The materials used were corn starch, lycopodium, toner and high density polyethylene as dusts, methane and hydrogen as combustible (perfect) gases and acetone and isopropanol as sp...

We investigate the properties, composition, and dynamics of dust formation growth for a diverse set core-collapse supernovae (CCSNe), varying progenitor mass, explosion energy, engine type. These explosions are evolved with 1-D Lagrangian hydrodynamics code out to several hundred days model ejecta as it expands cools. A multigrain nucleation is applied these results. find that higher energies l...