The effect of turbulence promoter on cross-flow microfiltration of skim milk

Krstić, Darko M.; Tekić, Miodrag N.; Carić, Marijana; Milanović, Spasenija D.

doi:10.1016/s0376-7388(02)00308-3

Cited by 89 publications

(43 citation statements)

References 20 publications

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“…Many authors have experimentally and numerically investigated the flow around a turbulence promoter. Studies concerning the use of static turbulence promoters (Krstic et al, 2002;Ranade and Kumar, 2006;Dendukuri, Karode and Kumar, 2005) demonstrated that membrane fouling can be reduced by increasing the wall shear stress in the vicinity of the membrane surface. Moulin et al (1999) and Moulin, Veyret and Charbit (2001) showed significant boost in filtration fluxes in the presence of Dean vortices, compared to the classical tubular membranes under the same operational conditions.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Geometry on Wall Shear Stress and Permeate Flux for Ceramic Membranes: CFD and Experimental Approaches

Springer

Ghidossi

Carretier

et al. 2010

Engineering Applications of Computational Fluid Mechanics

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Knowing how wall shear stress develops at the membrane surface is extremely useful when trying to reduce concentration polarization and fouling. Newly developed as well as manufactured ceramic membranes exhibit various channel geometries (cylindrical, square, triangular, etc). Mass transport characteristics depend on the geometry that conditions hydrodynamic conditions. The goal of this work is to study the influence of the channel geometry on the wall shear stress for various operating parameters (tangential velocity, transmembrane pressure…). Numerical simulations are performed for various inlet velocities for different channel geometries. The wall shear stress along the channel perimeter as a function of the shape and the cross section of the channel are studied. The influence of the geometry on the membrane performances is also studied. The simulated shear stress is employed to correlate experimental results. The results of this comparison show that mass transfer resistance depends on the wall shear stress alone, regardless of the flow rate, the shape or section of the channels.

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Section: Introductionmentioning

confidence: 99%

Study of the Effect of Geometry on Wall Shear Stress and Permeate Flux for Ceramic Membranes: CFD and Experimental Approaches

Springer

Ghidossi

Carretier

et al. 2010

Engineering Applications of Computational Fluid Mechanics

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“…Use of dynamic membranes [19] or application of external forces like electric field and ultrasound, application of Gas/air sparging [20] are other techniques for enhancement of membrane separation performance. The use of spacers (in organic polymeric membranes) and turbulence promoters (in tubular ceramic membranes to create turbulent flow at the surface of the membrane or to increase shear) also prove their efficiency in improvement of membrane separation performance in many cases [21][22][23][24][25][26]. However, the introduction of spacer and turbulence promoters increase the drop of TMP along the membrane and in some cases the washing of the system after use becomes more challenging.…”

Section: Citationmentioning

confidence: 99%

Untitled

2017

JABB

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The use of membrane technology as a processing and separation method in food industry is gaining wide application. Membrane separations can be used either as alternatives to conventional techniques or as novel technology for processing new ingredients and foods. Membrane separations are considered green technologies. In many cases, membrane processes are more advantageous than traditional technologies. For example, using cold pasteurization and sterilization with suitable membranes instead of high temperature treatment for the removal of microorganisms is more economical in terms of energy consumption. Using membrane filtration to remove microorganisms for shelf-life extension of foods instead of using additives and preservatives also create a green image for the processed foods as well as for the processing procedure. Concentration by membrane filtration instead of thermal evaporation does not employ severe heating and that it preserves the natural taste of food products and the nutritional value of heat-sensitive components. The recovery of valuable components in diluted effluents and wastewater treatment applications are among the most useful and currently active aspects of membrane technology. Pressure-driven membrane processes, namely MF, UF, NF and RO facilitate separation of components with a large range of particle sizes. It is for this reason that they find wide range of applications in food processing industry. The first part of this manuscript is to give introduction about very basic knowledge in membrane separation technology. More importantly, this review presents up-to-date commercial and potential applications of pressure-driven membrane separation processes in dairy processing industry. Keywords: Introduction Theory of membrane separationsPressure-driven membrane processes: The pressure-driven membrane processes include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO). When a feed is introduced to a membrane separation system it is separated into retentate (sometimes called concentrate), the fraction that is retained by the membrane, and permeate (also called filtrate), the fraction that passes through the membrane. The products of interest can either be in the retentate or in permeate or in both streams. The word 'pressure-driven' means that the main driving force for separation of these processes is transmembrane pressure (TMP), which is the pressure discrepancy between retentate sides and permeate side. Generally speaking, the pore sizes (or MWCO-molecular weight cut-off in cases of NF and RO) of membranes decrease in the order from MF to RO (Figure 1). However, the separation principle is not based on the pore sizes alone. Especially in UF and NF the charge of the molecules/solutes and their affinity for the filtering membrane are also important [1]. MF is normally used for separation of suspended particles and microorganisms from soluble components in feed. UF can be applied to separate soluble macromolecules such as proteins and peptides. NF...

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“…Newtonian fluids, such as, an aqueous solution, are being turbulent flow in most industrial applications, but within small diameter tubes or narrow niches, the turbulence is not high enough to develop adequate share force to build adequate flux [3,4].…”

Section: mentioning

confidence: 99%

Examination of Whey Degreasing by Modified Membrane Filtration

Szélpál¹,

Kohány²,

Fogarassy³

et al. 2016

JAST-B

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Abstract:The largest amount of dairy by-products, especially the whey, comes from the manufacture of cheese. The whey proteins are used in several different industry technologies. The forage production is used for animal feeding in the forms of various flours mixed in feeds, and the food industry uses whey proteins as human nutrition, such as different dry soups, infant formulas and supplements. The fat components of whey may inhibit the efficient processing and might impair the use of whey in these technologies. Thus, the aim of the experiment was to investigate a cheap and economical separation of the lipid fraction of whey. This separation method was made by microfiltration, which is an inexpensive, effective and energy efficient method for this task. During the measurements, 0.2 μm and 0.45 μm microfiltration membranes were used in a laboratory tubular membrane filtration module, and the membrane separation method was combined and modified by using astatic mixer and/or air insufflation. The same pore size membranes were used in a vibrating membrane filtration equipment (VSEP), too. The two different membrane filtration devices allowed the comparison of the effect of vibration and the effect of the static mixer and/or air insufflation. The flux values above 0.2 MPa transmembrane pressures strongly decreased on using the tubular membrane. Therefore, it can be determined that the use of the lower transmembrane pressures gave better flux combined with air insufflation and the use of static mixer. The flux values increased three times higher with using vibration during the microfiltration process than that without vibration. Comparing these methods, it can be concluded that the separation made on tubular membrane (0.2 µm) combined with statics mixer gave sufficient result according to the degreasing, retentions and flux values of the other components.

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The effect of turbulence promoter on cross-flow microfiltration of skim milk

Cited by 89 publications

References 20 publications

Study of the Effect of Geometry on Wall Shear Stress and Permeate Flux for Ceramic Membranes: CFD and Experimental Approaches

Study of the Effect of Geometry on Wall Shear Stress and Permeate Flux for Ceramic Membranes: CFD and Experimental Approaches

Untitled

Examination of Whey Degreasing by Modified Membrane Filtration

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