کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9684612 | 1456205 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of hydrodynamic instabilities on solute transport in a membrane system
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effect of the gravitational instability of the concentration boundary layers (CBLs) on the substance transport through a membrane is reported. The solute transfer is caused by the diffusion through the membrane and enhanced by the convective mass transport due the hydrodynamic vertical flow in near-membrane regions. The study has been carried out with binary mixtures-aqueous ethanol solution using laser interferometric technique. Measuring the concentration profiles, we have found that the transition from diffusive to diffusive-convective transport of solute at CBLs is related with stable or unstable behaviour of the CBLs. Their Rayleigh number determines the stability of these layers. The method to determine the critical concentration Rayleigh number is based on equation, which includes the diffusive permeability of the membrane, Ïm, solution parameters (density, Ï, kinematics viscosity, ν, diffusion coefficient, D) and critical value of the concentration boundary layers thickness, δcrit.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 265, Issues 1â2, 15 November 2005, Pages 94-100
Journal: Journal of Membrane Science - Volume 265, Issues 1â2, 15 November 2005, Pages 94-100
نویسندگان
K. Dworecki, A. ÅlÄzak, B. Ornal-WÄ
sik, S. WÄ
sik,