Application of CFD for simulation of a baffled tubular membrane

Ahmed, Saber; Seraji, Mahmood; Jahedi, Jonaid; Hashib, M. A.

doi:10.1016/j.cherd.2011.08.024

Cited by 34 publications

(18 citation statements)

References 44 publications

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“…Ahmad and Mariadas (16) observed increasing of permeate flux by application of helical baffles during the microfiltration of saccharomyces cerevisiae solutions. Also Ahmed et al (11) obtained similar results during the application of circular baffles in the microfiltration unit.…”

Section: Discussionsupporting

confidence: 68%

Simulation of the Effect of a Baffle Structure on Membrane Efficiency Using Computational Fluid Dynamics during the Clarification of Pomegranate Juice

et al. 2016

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A B S T R A C TBackground and Objectives: Pomegranate juice (PJ) contains large particles that stick to evaporator walls causing off flavors in the concentrate due to burning. Microfiltration is used to clarify PJ. Fouling is a limiting phenomenon that can prevent the industrialization of membrane clarification. Changes in the geometry of the membrane module such as using baffles are useful to decrease this problem. Computational fluid dynamics (CFD) is a powerful numerical tool used in modeling membrane processing. Materials and Methods:The effect of baffle geometry on the efficiency of membrane clarification of pomegranate juice in a flat-sheet module was simulated using computational fluid dynamics (CFD). The geometry of the membrane unit was plotted and meshed with Gambit software, and was solved using FLUENT software. A two-dimensional double-precision method at steady state was selected to simulate the membrane process. The convective terms were discretized with a standard first-order upwind scheme in computational solution. The RNG k-model was used due to its high accuracy in eddy flows with a low Reynolds number. The effects on the process performance of the number of baffles, their angle and the distance between the baffles and the membrane surface were evaluated. Results:The results showed that the configuration with the feed-channel height of 2 cm, the baffle angle of 90 o and the distance between the membrane surface and baffles of 2 mm had maximum permeate flux. Conclusions: Reducing the distance between the baffles and the membrane surface increased the permeate flux due to create an eddy flow near the membrane surface in the flat-sheet module and reduced the total and cakelayer resistances.

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Section: Discussionsupporting

confidence: 68%

Simulation of the Effect of a Baffle Structure on Membrane Efficiency Using Computational Fluid Dynamics during the Clarification of Pomegranate Juice

et al. 2016

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“…One study applied a novel turbulence promoter, namely a corrugated micro‐channel turbulence promoter with micro‐pores, to mitigate membrane fouling in a submerged flat sheet membrane bioreactor, in which the induced shear stress reached to 7.59 Pa (Table ). Ahmed et al studied shear stress induced by turbulent flow in a tubular membrane channel configured in a set of baffles using computational fluid dynamics (CFD) simulation, and found that the presence of baffles could improve local shear stress (0–20 Pa) on the membrane surface (Table ).…”

Section: Methods Of Creating Shear Stress In the Membrane Systemmentioning

confidence: 99%

Shear stress in a pressure-driven membrane system and its impact on membrane fouling from a hydrodynamic condition perspective: a review

Wang

Leslie

et al. 2016

J. Chem. Technol. Biotechnol

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Pressure‐driven membrane technology has gained increasing popularity in municipal/domestic and industrial wastewater treatment, desalination, and water reclamation. Careful manipulation of surface shear stress, which plays a vital role in membrane fouling control from a purely hydrodynamic perspective, can minimise concentration polarisation of solute on flat sheet membranes, or enhance the particle back transport from hollow fibre membranes. This review considers the techniques to generate turbulence and shear at the membrane surface, the magnitude of shear stress, and the experimental, as well as numerical methods for evaluation of shear stress. The findings are presented in terms of the amount of shear stress reported to control membrane fouling in these systems. Operational disadvantages of fouling control via application of shear stress occur while changing the properties of the solute or particles, such as cell breakup, bacterial population change, or shear stress classification. The literature teaches that future developments on shear stress for membrane systems must be addressed, in addition to energy consumption, shear stress distribution and the development of combined analytical methods to characterise and visualise shear in situ for different membrane configurations. © 2016 Society of Chemical Industry

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“…The use of CFD can deal well with concentration dependent properties [22][23][24] and is more accurate since it is based on first principles without simplifications. Numerical codes have been applied to study new membrane modules [25][26][27] , fouling [28] , gel formation [29,30] and concentration polarization in impinging jet cells [31] , parallel plate cells [21,23,32,33] and hybrid membrane cells [34][35][36][37] . They have also been used to study the effect of concentration polarization on protein separation [22,38] .…”

Section: Introductionmentioning

confidence: 99%

Membrane Characterization Based on PEG Rejection and CFD Analysis

Baldasso

Pinto

Silveira

et al. 2015

Separation Science and Technology

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Characterization of membrane pore size by experimental methods is usually done by the determination of the rejection of polymeric molecules having a range of sizes such as PEG. These experiments are affected by concentration polarization, which can lead to erroneous interpretation of the results, mainly because the concentration and the permeate flux change along the membrane surface. Additionally, experimental methods alone are insufficient to obtain the membrane pore size. To improve the current approach, numerical methods are used to understand mass transport limitations in rejection experiments and to predict the membrane pore size. In the current study, the results show that the ultrafiltration membrane has a MWCO of 20 kDa, different from the value set by the manufacturer (30 kDa). For the experimental conditions, concentration dependent viscosity and osmotic pressure do not influence the permeate flow rate or rejection. Moreover, the membrane pore size was found to be 2.59 nm. This value was determined comparing rejection values obtained by numerical and experimental results. Numerical analysis is also important to characterize the flow and mass transport in each point at membrane surface.

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Application of CFD for simulation of a baffled tubular membrane

Cited by 34 publications

References 44 publications

Simulation of the Effect of a Baffle Structure on Membrane Efficiency Using Computational Fluid Dynamics during the Clarification of Pomegranate Juice

Simulation of the Effect of a Baffle Structure on Membrane Efficiency Using Computational Fluid Dynamics during the Clarification of Pomegranate Juice

Shear stress in a pressure-driven membrane system and its impact on membrane fouling from a hydrodynamic condition perspective: a review

Membrane Characterization Based on PEG Rejection and CFD Analysis

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