کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
632549 | 1455999 | 2016 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Efficient CFD-based method for designing cross-flow nanofiltration small devices
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
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چکیده انگلیسی
Small devices of cross-flow nanofiltration (NF) may become a tool to concentrate small samples of valuable substances, if the concentration polarization can be minimized by designing new feed channels with bas-reliefs similar to the ones that have been developed for efficient passive micromixers. These bas-reliefs may have a complex 3D shape and the recourse to intensive CFD simulations is necessary to optimize the geometry. To speed up the simulations, a hybrid, semi empirical approach is used where the average and local mass transfer coefficients are first computed by CFD, using a dissolving wall instead of a semi-permeable membrane boundary condition. The computed mass transfer coefficients are then used to predict the local and average concentration polarization, using a mass transfer correction factor correlation. This computational approach was validated using detailed CFD simulations and experimental concentration distributions obtained by holographic interferometry. A NF ribbed-wall rectangular channel with 2Â mm height was used, with potassium sulfate solutions, transmembrane pressures lower than 8Â bar and Reynolds numbers between 1 and 125. Using this computational approach, local and average concentration polarization and permeate flux were predicted with an error less than 15%. With these findings, it is possible to speed up the simulation and design of small nanofiltration cross-flow devices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 500, 15 February 2016, Pages 190-202
Journal: Journal of Membrane Science - Volume 500, 15 February 2016, Pages 190-202
نویسندگان
Carlos Completo, Viriato Semiao, VÃtor Geraldes,