A unified mechanism for unconfined deflagration-to-detonation transition in terrestrial chemical systems and type Ia supernovae

We present a unified theory of turbulence-induced DDT that describes the mechanism and conditions for initiating detonation both in unconfined chemical and thermonuclear explosions. The model is validated by using experiments with chemical flames and numerical simulations of thermonuclear flames. We use the developed theory to determine criteria for detonation initiation in the single-degenerate Chandrasekhar-mass SNIa model and show that DDT is almost inevitable at densities of 107 to 108 grams per cubic centimeter.

Source: ScienceNOW - October 30, 2019 Category: Science Authors: Poludnenko, A. Y., Chambers, J., Ahmed, K., Gamezo, V. N., Taylor, B. D. Tags: Physics, Applied, Astronomy, Chemistry, Online Only r-articles Source Type: news