Particle fluctuating motions induced by gas-solid phase reaction

A novel particle fluctuating motion induced by chemical reaction is investigated. Fluctuation characteristics of petcoke particles at different reaction temperatures are analyzed. The fluctuating velocity of particles increased with the combustion temperature. It is revealed that the irregular micro-structure of particles and nonuniform distribution of active sites on particle surface account for the particle fluctuations. The various release velocity of gaseous product in different reaction micro-areas induce unbalanced bearing force of particles, which directly result to the particle fluctuating motions. Besides, the micro-structure characteristics of single particle evolved with the reaction proceeding. In this case, the random fluctuation of petcoke particles occurred during the reaction process. The average fluctuating velocity of petcoke particles follows the Arrhenius equation. This study is a supplement to the fluid mechanics of gas-solid phase flows existing chemical reaction.