Limits of mass transfer in parallel-plate dialysers

✍ Scribed by Spas D. Kolev; Willem E. van der Linden

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 430 KB
• Volume: 256
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85358-d

✦ Synopsis

The absolute hmlts of mass transfer across the membrane m a parallel-plate dlalyser set by the flow pattern m both channels were determmed on the basis of a mathematical model assummg axially dispersed plug flow The lower hmit corresponds to the case of mass transfer under lammar flow condltlons For determmatlon of the upper hmit for the same values of the parameters Influencing the flow regime (e g , flow-rate, mean residence tlme), plug flow and Instant restoratlon of the transverse concentration umformlty, dlsturbed by the mass-transfer process, were assumed This case corresponds to mfnutely high Peclet numbers and mass-transfer coefiiclents (Sherwood numbers) m both channels For a particular gross flow pattern m the channels (I e , residence time dlstnbutlon), characterized by non-zero axial dlsperslon, the lower hmlt wdl comclde agam v&h the lammar case However, the upper hmlt m such a case will correspond to mfmltely high mass-transfer coefficients but finite Peclet numbers and ~111 be lower than the absolute upper hmlt of the dlalyser mentioned above The results obtamed allow the estunatlon of the range wlthm which the mass transfer m real parallel-plate dlalysers can be expected