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Received November 20, 2002
Accepted March 20, 2003
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A Unified Conjugate Mass Transfer Model of VOC Emission
Industrial Liaison Research Institute, Kyung Hee University, Yongin 449-701, Korea 1College of Mechanical & Industrial System Engineering, Kyung Hee University, Yongin 449-701, Korea
cnkim@khu.ac.kr
Korean Journal of Chemical Engineering, July 2003, 20(4), 685-692(8), 10.1007/BF02706908
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Abstract
This paper develops a unified conjugate mass transfer model for VOC (Volatile Organic Compound) emission, which implies conjugate boundary condition for mass transfer at the material-air interface. Thus, no special treatment is needed at the material-air interface and numerical methods for conjugate heat transfer problem can be applied directly. The material-air partition coefficient has been taken into account and its effect is the same as specific heat in the energy equation. The equivalent diffusion coefficient in the material KmaDm instead of Dm characterizes the rate of mass transfer. The ratio KmaDm/Da indicates whether VOC emission is controlled by the internal diffusion or not. The equivalent air-phase initial concentration C0/Kma determines the order of maximum concentration in the air. VOC emission contains two stages: the initial stage and the pseudo-steady stage when the emission rate nearly equals mass rate_x000D_
through the outlet of the air. Diffusion coefficient of VOC in the material has a significant effect on VOC emission in the two stages. The effect of partition coefficient on VOC emission depends on the value of KmaDm/Da.
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