Numerical simulation and growth mechanism of TiO2 prepared by gaseous detonation

TiO2 particles synthesized by gaseous detonation were collected through detonation interception, and the hydrogen-oxygen explosion process within a closed detonation tube was analyzed using numerical simulations. The influence of varying detonation parameters and interception positions on TiO2 particle growth was examined, and the dynamic growth mechanism of TiO2 during the explosion process was investigated. The analysis revealed that the hydrogen-oxygen explosion in the closed detonation tube consists of two stages: detonation and deflagration. During the detonation stage, the detonation parameters remain relatively stable. In contrast, during the deflagration stage, the detonation parameters exhibit variation, though the overall trend is a decrease. The interval of peak parameter recurrence increases with the propagation distance of the detonation wave. TiO2 growth occurs during both the detonation and deflagration stages. The difference between the TiO2 particles collected by interception and those collected from the tube wall is attributed to the varying heating duration during the deflagration stage, with the particle size of the intercepted samples decreasing as the distance from the initiation point increases. This study establishes a correlation between TiO2 particle growth and detonation wave propagation, providing a new perspective for the controlled gaseous detonation synthesis of TiO2.