stochastic spray model for radio frequency inductively coupled plasmas.
Published: 2004
Language: eng
Number of pages: 161
Description: The model was used to predict the outcomes of droplet collisions of a water spray. The results agree well with the experimental and the analytical results. The model predicts that droplet collisions can increase the average droplet size of both mono-disperse and poly-disperse sprays. For dense sprays, droplet collisions delay the spray evaporation. For thin sprays, the effect of droplet collisions on the spray evaporation could not be predicted before the calculation.The model was also used to predict the height of complete evaporation of aqueous sprays in a 1.0 kW argon plasma. The results show a good agreement with the experimental observation. The results show that the injection of liquid sprays into the plasma leads to a temperature decrease in the spray area. This temperature decrease increases with the increase of the liquid mass injected into the plasma. The temperature decrease results in a delay on the spray evaporation. The results also show that the height of complete evaporation for liquid sprays in the plasma increases linearly with the increase of central gas flow rate, while it decreases by an approximately inverse relationship with the increase of the forward power.A stochastic spray model has been implemented into a time-dependent, 2-D radio frequency inductively coupled plasma model. Plasma-droplets interactions, droplet collisions, and droplet breakup were included. The plasma model was solved using the Eulerian method. The spray model was solved using the discrete parcel method combined with a stochastic Monte Carlo technique.Finally, the evolution of liquid sprays in high-power plasmas was studied. The effects of the spray parameters on the local cooling of the plasma and the spray evaporation were investigated. It was found that the liquid mass flow rate and the droplet size were the most important factors that influenced the spray evaporation. The model was also used to predict the evaporation and the droplet collisions of hydrocarbon sprays in the plasma. The results suggested that the collision model should be extended to include the characteristics of hydrocarbon droplet collisions.
Notes: Adviser:  Jared Mosteghimi.

Thesis (Ph.D.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2594.