Simulation of electronic processes of nanoenergetic gas generator using Cabrera Mott oxidation model
Abstract
Description
This research study is a theoretical framework for understanding rapid thermal
processes which occur during the performance of new Nanoenergetic Gas-Generators
(NGG) systems that rapidly release a large amount of gaseous products and generate a
fast-moving thermal wave during the explosion. The kinetics of rapid oxidation of metal
nanoparticles acquires practical importance with the quickly developing nanoenergetic
systems. The thin film oxidation theory of Cabrera-Mott model was examined for a
spherically symmetric case and used to analyze the physical importance of the
exothermic processes for prediction of the reaction time and front velocity. A rapid
kinetic of oxide growth on the outer part of oxide layer of aluminum ions during the
oxidation of a spherical aluminum nanoparticle was evaluated by using the Cabrera -
Mott moving boundary mechanism with self-heating process.
The electrical potential was determined and correlated to the reaction time, which
a leads to the solution of a nonlinear Poisson equation in a moving boundary domain.
Motion of the boundary is determined by the gradient of a solution on the boundary (via a
Gibbs factor). We have considered an accurate self-heating model of particle oxidation
based on the balance of energy released as a result of chemical reaction. We have used
detailed modeling of the heat loss, which is mainly due to convection. We investigated
this problem numerically, using COMSOL and MATLAB for detailed air convection
dynamics. It was demonstrated that the oxidation rates dramatically increased as a
combined effect of nonlinearity and self-heating.
PDF; 71pgs.
PDF; 71pgs.