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Received June 16, 2011
Accepted August 2, 2011
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Transport analysis in reverse electrodialysis with pulsatile flows for enhanced power generation
Complex Fluids Laboratory, National Agenda Res. Division, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 136-791, Korea 1Department of Chemical Engineering, Hong-Ik University, Mapo-gu, Seoul 121-791, Korea 2School of Urban and Civil Engineering, Hong-Ik University, Mapo-gu, Seoul 121-791, Korea
mschun@kist.re.kr
Korean Journal of Chemical Engineering, February 2012, 29(2), 162-168(7), 10.1007/s11814-011-0198-y
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Abstract
Time-dependent velocity profile and concentration distributions formed in a single reverse electrodialysis (RED) unit have been successfully pursued using simulation framework for evaluating performance of the unit, i.e., open circuit voltage and short circuit current. The single RED unit consists of two adjunct fluid channels, separated by the semi-permeable membrane. Through one of the channels, sea water flows, and the other is occupied by fresh water, flowing in the opposite direction (countercurrent operation). The diffusion-convection transport of the rate-limiting ion, Na+ in this study, for both channels is treated. The diffusive transport of cation across the membrane is expressed as boundary conditions for the bi-mechanism model. Our simulations conducted using an orthogonal collocation on finite element scheme show that the concentration difference of 35 g/L between sea water and fresh water results in the open circuit voltage of 63 mV and the short circuit current density of 11.5 A/m2. These values are close to ones that were obtained from the experiments.
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References
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Veerman J, Saakes M, Metz SJ, Harmsen GJ, J. Membr. Sci., 327(1-2), 136 (2009)
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Masliyah JH, Bhattacharjee S, Electrokinetic and colloid transport phenomena, Wiley, Hoboken (2006)
Cussler EL, Diffusion: Mass transfer in fluid systems, 3rd Ed., Cambridge University Press, New York (2009)
Pivovar BS, Wang YX, Cussler EL, J. Membr. Sci., 154(2), 155 (1999)
Jeong Y, Kang IS, Korean J. Chem. Eng., 12(5), 540 (1995)
Kim KS, Simon L, Comput. Chem. Eng., 35(6), 1152 (2011)
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Finlayson BA, Nonlinear analysis in chemical engineering, McGraw-Hill, New York (1980)
Turek M, Bandura B, Desalination, 205(1-3), 67 (2007)
Goswami P, Chakraborty S, Langmuir, 26(1), 581 (2010)
Vedel S, Olesen LH, Bruus H, J. Micromech. Microeng., 20, 035026 (2010)
