Study of the condensation of metal vapor in a converging nozzle
Master of Science
The nucleation and growth of zinc vapor in converging nozzles are modeled. The temperature, pressure, velocity and growth distributions along the nozzle are calculated. The size distributions of the exiting particles are plotted. The results of nozzles with different initial pressures and different lengths (different nozzle half angles) are compared. The validity of Quasi-One Dimensional Approximation related to velocity and temperature distributions is discussed. This nucleation process is also experimentally studied with the nozzle of linearly varying cross sections at different initial vapor temperatures. The produced final metallic particles are examined by SEM (Scanning Electron Microscopy) and the size distributions are obtained. It shows that the experimental results corroborate the theoretical predictions.