Mass transfer in the membrane concentration polarization layer under turbulent cross flow : II. Application to the characterization of ultrafiltration membranes |
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| Affiliation: | 1. Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, 101 Vernadsky Avenue, bldg 1, Moscow 119526, Russia;2. Bauman Moscow State Technical University, 5 Second Baumanskaya Street, Moscow 105005, Russia;3. National Research Nuclear University MEPhI, 31 Kashirskoe Shosse, Moscow 115409, Russia;1. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang''an University, Xi''an, Shaanxi 710054, P.R. China;2. School of Environmental Science and Engineering, Chang''an University, Xi''an, Shaanxi 710054, P.R. China;3. Department of Civil, Environmental, and Construction Engineering, Texas Tech University, Lubbock, TX 79409-1023, United States;4. School of Civil Engineering, Chang''an University, Xi''an, Shaanxi 710061, PR China |
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| Abstract: | Eleven commercial membranes with MW cut-off values between 5,000 and 25,000 daltons have been characterized using a 0.5% Dextran T10 solution as a test substance. In order to predict the concentration at the membrane wall, Sherwood correlations based on various turbulence models have been used. The effects of the roughness of the membrane and viscosity changes due to concentration polarization and suction through the membrane have also been considered. The results have been compared with an uncorrected film theory model in a Reynolds interval of 10000-20000. It is difficult to test the models unless a direct method of estimating the concentration at the membrane wall is developed. However, some conclusions can be drawn about the applicability of the suggested models, according to the type of membrane used. It was also noted that the differences between the models tended to diminish with increasing Reynolds numbers. |
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