Slezak A, Wasik J, Sieroń A
Instytut Fizyki Wyzszej Szkoły Pedygogicznej, Czestochowie.
Polim Med. 1998;28(3-4):11-22.
A method of determination critical value of concentration Rayleigh Number ((Rci)lim.) in isothermal membrane transport processes of three component non-electrolyte solutions was worked out. The method based on the derived in the paper equation, which include membrane transport coefficients (hydraulic permeability, reflection and diffusive permeability coefficients), solution parameters (viscosity coefficient, density and diffusion coefficient in solution). In order to experimental verification of these method the transport coefficients of symmetric flat polymeric membrane, parameters of solutions and diffusive flux for glucose solution in 0.2 mole/l aqueous ethanol solution were determined. Experiments were carried out by osmotic-diffusive single-membrane double-cell system. One cell in all experiments was filled with pure water while the other with the examined solutions. The experimental critical value of concentration Rayleigh Number (RCi)lim. = 1799 is comparable with theoretical critical value of thermal Rayleigh Number (TT)lim. = 1707.
研究出了一种确定三元非电解质溶液等温膜传输过程中浓度瑞利数（(Rci)lim.）临界值的方法。该方法基于本文推导的方程，这些方程包含膜传输系数（水力渗透率、反射和扩散渗透率系数）、溶液参数（粘度系数、密度和溶液中的扩散系数）。为了对该方法进行实验验证，测定了对称平板聚合物膜的传输系数、溶液参数以及0.2摩尔/升乙醇水溶液中葡萄糖溶液的扩散通量。实验通过渗透扩散单膜双池系统进行。在所有实验中，一个池填充纯水，另一个池填充待测溶液。浓度瑞利数（RCi）lim.的实验临界值 = 1799，与热瑞利数（TT）lim.的理论临界值 = 1707相当。
