Temperature Jumps in Free Metal Particle Combustion

Abstract

The problem of multistage metal particles combustion has been discussed in the present paper. Experimental research on metal particles burning has been undertaken on the basis of a new means of their formation and ignition by a pulse discharge

The experimental method has resulted in obtaining monodisperse metal particles made of different metals (Cu, Mo, Al, Fe, W) with controlled initial temperatures and velocities in various media. We have observed flashes and temperature jumps during the above-mentioned metal particle burning in cool air. We observed the same phenomena also with particles which were quickly introduced into inert gas after a certain period of their combustion in the air.

While studying the inner structure of Cu and Mo particles we found dissolved oxygen within the particles. The importance of the oxygen diffusive process in the high-temperature metal droplets in the cool active ambient gas for the following flashes and sudden temperature changes has been shown.

A model, for processes with a burning copper droplet has been proposed.

Key words:

• Metal particle
• combustion
• flashes
• temperature jump