The Washout of Hydrogen Fluoride
The washout of Hydrogen fluoride, emitted by a continuous point source has been considered as being an absorption process.
According to Hales (1972), the fundamental equations describing this process are developed and are discussed more in detail for 2 special cases; namely the irreversible and reversible washout. In both cases the influence on the fluoride concentration in a raindrop of stack height, distance from the source and raindrop radius has been discussed. Moreover, the mean concentration during a real rainshower has been calculated.
From the previous theoretical study a computer program has been developed in order to simulate the fluoride washout around a brickworks in Belgium. This program is able to predict very well the experimental washout values obtained from a precipitation sampling network set up in a radious of 2 km. around these brick works and using a sampling period of 2 weeks.
KeywordsFluoride Concentration Sherwood Number Atmospheric Stability Hydrogen Fluoride Drop Diameter
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