Journal ArticleDOI
Concentration polarization in a reverse osmosis test cell
G. Jonsson,C.E. Boesen +1 more
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TLDR
In this article, the transfer from laminar to turbulent flow occurs in the region Re = 1000-2500 and the results can be represented by the equation Sh = A · Re 0.80 · Sc 0.33 where the constant A is independent of the solute mobility and membrane retention, but varies with the channel height and the distance from the inlet zone.About:
This article is published in Desalination.The article was published on 1977-05-01. It has received 87 citations till now. The article focuses on the topics: Laminar flow & Concentration polarization.read more
Citations
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Journal ArticleDOI
Simple technique for measuring the concentration polarization level in a reverse osmosis system
TL;DR: In this article, a simple technique for determining the mass transfer coefficient and the concentration polarization level in a reverse osmosis (RO) system is described. And the proposed technique was verified by experiments performed in a tubular RO system under turbulent flow conditions.
Journal ArticleDOI
A study of CaCO3 scale formation and inhibition in RO and NF membrane processes
C. H. Tzotzi,C. H. Tzotzi,T. Pahiadaki,S.G. Yiantsios,Anastasios J. Karabelas,Nikolaos Andritsos +5 more
TL;DR: In this paper, the formation of CaCO3 deposits on RO and NF membranes was investigated in connection with permeate flux decline, in the presence and absence of scale inhibitors, in order to examine the extent of metastable region without scaling and the scale characteristics.
Journal ArticleDOI
Boundary layer phenomena during ultrafiltration of dextran and whey protein solutions
TL;DR: The osmotic pressure and viscosity of dextran and whey protein solutions were measured at concentrations up to 50 wt%. as discussed by the authors showed that the flux-pressure data for ultra-filtration at varying concentrations and circulation velocities can be explained by the increased OSS of the concentrated boundary layer.
Journal ArticleDOI
Mass transfer coefficients in cross-flow ultrafiltration
TL;DR: In this article, two methods were tested: a method using the osmotic pressure difference during an ultrafiltration experiment, and a method based on the variation in observed retention when cross-flow velocities are changed.
Journal ArticleDOI
Estimation of mass transfer coefficient using a combined nonlinear membrane transport and film theory model
Z.V.P. Murthy,Sharad Gupta +1 more
TL;DR: In this article, the mass transfer coefficient (k) in reverse osmosis was estimated using the combined Spiegler-Kedem/film theory model and the solution-diffusion model.
References
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Journal ArticleDOI
Hyperfiltration. Concentration Polarization in Tubular Systems with Dynamically Formed Membranes
Journal ArticleDOI
Control of concentration polarization in reverse osmosis desalination of water
H. Strathmann,B. Keilin +1 more
TL;DR: In this article, a thin channel reverse osmosis test device under laminar flow conditions was used to simulate the high flux conditions expected of future desalination membranes, and it was demonstrated that concentration polarization can be controlled with small expenditure of energy in laminara flow and thin channels for membrane permeation fluxes up to 60 gallons/sq. ft. day and fractional feed water recovery of more than 50%.
Journal ArticleDOI
Diffusion-layer structure in reverse osmosis channel flow
T.J. Hendricks,F.A. Williams +1 more
TL;DR: In this paper, electrical conductivity microprobes were used to measure salt concentration in brine adjacent to the membrane during reverse osmosis, and an integral technique, developed on the basis of an exponential profile assumption, was found to provide reasonable agreement between theoretical and experimental concentration profiles.
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