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Effect of turbulence on volatilization of selected organic compounds from water
Author(s) -
Peng Jian,
Bewtra Jatinder K.,
Biswas Nihar
Publication year - 1995
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143095x131240
Subject(s) - volatilisation , turbulence , volume (thermodynamics) , volatility (finance) , chemistry , mass transfer , intensity (physics) , surface area to volume ratio , surface water , phase (matter) , thermodynamics , environmental engineering , environmental science , chromatography , organic chemistry , physics , quantum mechanics , financial economics , economics
Volatilization of selected organic compounds, with Henry's law constant larger than 10 −3 atm‐m 3 /mole, from water under turbulent conditions has been studied. Surface area:volume ratio and water‐bulk turbulent intensity were the two major parameters that varied in the experiments. A model based on idealized surface renewal process is proposed. Based on this model, an equation incorporating the surface area:volume ratio and turbulent intensity (expressed in terms of the velocity gradient, G ) is derived by solving appropriate mass‐transfer differential equations. The derived model has been calibrated and verified with the experimental results. Both the theoretical model and the experimental results confirm that the volatilization of high‐volatility compounds from water into air follows first‐order kinetics with respect to the chemical concentration in water‐bulk phase. The volatilization rate constant is found to be proportional to the surface area:volume ratio. It is also observed that the turbulent intensity in the water phase is an important parameter in controlling the volatilization of chemicals from the water.