A Unified Conjugate Mass Transfer Model of VOC Emission

Baoqing Deng; Chang Nyung Kim

Korean Journal of Chemical Engineering, Vol.20, No.4, 685-692, July, 2003

DOI10.1007/BF02706908 Export Citation

A Unified Conjugate Mass Transfer Model of VOC Emission

Baoqing Deng, and Chang Nyung Kim^{1, †}

Industrial Liaison Research Institute, Kyung Hee University, Yongin 449-701, Korea
¹College of Mechanical & Industrial System Engineering, Kyung Hee University, Yongin 449-701, Korea

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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 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.

Keywords:Volatile Organic Compounds;CFD;Numerical Model;Conjugate Mass Transfer;Pseudo-steady State

[References]

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[Referenced By]

[1] Choi KH, Korean J. Chem. Eng., 16(4), 441 (1999)

[2] Huang H, Haghighat F, Building Environ., 37, 1349 (2002)

[3] Juncu G, Int. J. Heat Mass Transf., 45(18), 3817 (2002)

[4] Launder BE, Spalding DB, Comput. Methods Appl. Mech. Eng., 3, 269 (1974)

[5] Lee SC, Choi CR, Kim CN, Proceedings SAREK, 13, 627 (2001)

[6] Little JC, Hodgson AT, Gadgil AJ, Atmospheric Environ., 28, 227 (1994)

[7] Murakami S, Kato S, Ito K, Yamamoto A, "Analysis of Chemical Pollutant Distribution Based on Coupled Simulationof CFD and Emission/Sorption Processes," Proceedings of the 8th Int. Conference on Indoor Air Quality and Climate, 4, 725 (1999)

[8] Sparks LE, Tichenor BA, Chang J, Guo Z, Indoor Air, 6, 31 (1996)

[9] Topp C, Nielsen PV, Heiselberg P, Indoor Air, 11, 162 (2001)

[10] Yang X, Chen Q, Bluyssen PM, ASHRAE Trans., 104, 1297 (1998)

[11] Yang X, Chen Q, Zhang JS, Magee R, Zeng J, Shaw CY, Building Environ., 36, 1099 (2001)

[12] Yu C, Crump D, Building Environ., 33, 357 (1998)