An influence of expressions for thermophysical parameters on calculation results of melting and detonation combustion of aluminum suspensions

The influence of the method for determining the specific heat coefficient on the processes of aluminium melting and propagation of heterogeneous detonation in a mixture of gas and ultrafine aluminum particles is analyzed. Melting process is described within the phenomenological approach for particles with a radius of 6 and 15 nm. An insignificant effect of the relation between the heat capacity and the particle temperature and radius on melting time and temperature distribution inside the particle has been established. The detonation process is studied for stoichiometric suspensions of 50-nm and 1-µm aluminum particles, taking into account the transition from diffusion to kinetic regime of combustion with decreasing particle size. An insignificant influence of the specific heat coefficient representations on the results of detonation structure calculations is established for nanoparticles. For micron aluminum particle suspensions, the 20% difference in the Chapman-Jouguet pressure has been obtained. (paper)