The effects of flashing on black liquor spray patterns were investigated by analyzing a large number of spray images obtained from laboratory experiments using small scale splashplate nozzles with water at the University of Toronto, and experiments using real size splashplate nozzles with black liquor at Aalto University. The results show that flashing produces small droplets and increases the droplet velocity. The liquor mass flow rate varies with direction: it is higher at the center compared to the sides of the spray sheet, particularly at a low excess temperature. At high excess temperatures, however, the mass distribution becomes more uniform across the spray sheet. Criteria have been developed for predicting the onset of flashing and for estimating the mean droplet size of the black liquor spray under flashing conditions.
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