RT Journal Article T1 Thermal boundary layers in sweeping gas membrane distillation processes A1 Khayet Souhaimi, Mohamed A1 Godino Gómez, María Paz A1 Mengual Cabezón, Juan Ignacio AB The sweeping gas membrane distillation process was analyzed in a plate and frame membrane module, and a method clarifying the contribution of each boundary layer separately was developed. The temperature polarization coefficients of the fluid phases as well as the overall one have been defined, and their effects on the permeate flux were studied. Also studied is the influence of experimentally relevant parameters, such as the inlet temperatures or circulation velocities of the fluids. Results from two porous and hydrophobic membranes in different experimental conditions were interpreted oil the basis of a combined Knudsen/molecular diffusion flow model. The theory agreed well with the experiment. SN 0001-1541 YR 2002 FD 2002-07-02 LK https://hdl.handle.net/20.500.14352/59003 UL https://hdl.handle.net/20.500.14352/59003 LA eng NO ASHRAE, Fundamentals-Handbook, American Society of Heating, Refrigerating and Air-Conditioning Engineers, New York (1993).Basini, L., G. D´Angelo, M. Gobbi, G. C. Sarti, and C. Gostoli, ‘‘A Desalination Process Through Sweeping Gas Membrane Distillation,’’ Desalination, 64, 245 (1987).Bird, R. B., W. E. Stewart, and E. N. Lightfoot, Transport Phenomena, Wiley, New York (1960).Chmielewski, A. G., G. Zakrzewska-Trznadel, N. R. Miljevic, and W. A. Van Hook, ‘‘Membrane Distillation Employed for the Separation of Water Isotopic Compounds,’’ Sep. Sci. Technol., 30 (7-9), 1653 (1995).Drioli, E., and Y. Wu, ‘‘Membrane Distillation: An Experimental Study,’’ Desalination, 53, 339 (1985).Franken, A. C. M., J. A. M. Nolten, M. H. V. Mulder, D. Bargeman, and C. A. Smolders, ‘‘Wetting Criteria for the Applicability of Membrane Distillation,’’ J. Memb. Sci., 33, 315 (1987).Godino, M. P., L. Peña, and J. I. Mengual, ‘‘Membrane Distillation: Theory and Experiments,’’ J. Memb. Sci., 121, 83 (1996).Gryta, M., and M. Tomaszewska, ‘‘Heat Transport in the Membrane Distillation Process,’’ J. Memb. Sci., 144, 211 (1998).Incropera, F. P., and D. P. Dewitt, Introduction to Heat Transfer, Wiley, New York (1985).Khayet, M., M. P. Godino, and J. I. Mengual, ‘‘Theory and Experiments on Sweeping Gas Membrane Distillation,’’ J. Memb. Sci., 165, 261 (2000a).Khayet, M., M. P. Godino, and J. I. Mengual, ‘‘Nature of Flow in Sweeping Gas Membrane Distillation,’’ J. Memb. Sci., 170, 243(2000b).Kreith, F., and M. S. Bohn, Principles of Heat Transfer, PWS, Boston (1997).Lawson, K. W., and D. R. Lloyd, ‘‘Membrane Distillation,’’ J. Memb. Sci., 124, 1 (1997).McAdams, W. H., Transmisión de Calor, Del Castillo, Madrid (1964).Ortiz de Zárate, J. M., F. García López, and J. I. Mengual, ‘‘Temperature Polarization in Non-Isothermal Mass Transport Through Membranes,’’ J. Chem. Soc. Faraday Trans., 86 (16), 2891 (1990).Peña, L., J. M. Ortiz de Zárate, and J. I. Mengual, ‘‘Steady States in Membrane Distillation: Influence of Membrane Wetting,’’ J. Chem. Soc. Faraday Trans., 89 (24), 4333 (1993).Sarti, G. C., C. Gostoli, and S. Matulli, ‘‘Low Energy Cost Desalination Processes Using Hydrophobic Membranes,’’ Desalination, 56, 277 (1985).Schofield, R. W., A. G. Fane, and C. J. D. Fell, ‘‘Heat and Mass Transfer in Membrane Distillation,’’ J. Memb. Sci., 33, 299 (1987).Schofield, R. W., A. G. Fane, and C. J. D. Fell, ‘‘Gas and Vapor Transport Through Microporous Membranes I and II,’’ J. Memb. Sci., 53, 159 (1990).Vázquez González, M. I., and L. Martínez, ‘‘Water Distillation Through PTFE Hydrophobic Membranes,’’ J. Chem. Soc. Faraday Trans., 90, 2043 (1994). NO Economical support from the CICYT is acknowledged. NO CICYT DS Docta Complutense RD 6 may 2024