CFD simulation of turbulence promoters in a tubular membrane channel

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

doi:10.1016/j.desal.2011.03.045

Cited by 50 publications

(25 citation statements)

References 38 publications

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“…In general, pressure gradients at these planes, but with smaller variations, are observed. Similar behavior was observed by Rahimi et al, 16 Ahmed et al, 17 and Souza.…”

Section: Hydrodynamic Analysis Without Waterproofingsupporting

confidence: 76%

Produced water treatment by ceramic membrane: A numerical investigation by computational fluid dynamics

Magalhães

Lima

Neto

et al. 2017

Advances in Mechanical Engineering

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The disposal of industrial effluents into the environment is an issue that has attracted attention of researchers and engineers with particular reference for produced water originating from the petroleum industry. Separation process using ceramic membranes has been an alternative used to obey requirements of environmental agencies in Brazil related to disposal of oil and grease. Accordingly, we have studied numerically the fluid flow into a separation module with tubular membrane. The conservation equations for mass, linear momentum, and mass transport in conjunction with the renormalization group k-e turbulence model were resolved with aid of the ANSYS CFX 12 commercial package. Results of the streamlines, vector velocity, pressure, velocity, and concentration fields are presented and analyzed. It was concluded that the proposed mathematical model predicts the behavior of the flow within the separation module and that increasing the level of turbulence and putting an impermeable section into the inlet region of the membrane reduce the effect of the polarization layer.

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“…In general, pressure gradients at these planes, but with smaller variations, are observed. Similar behavior was observed by Rahimi et al, 16 Ahmed et al, 17 and Souza.…”

Section: Hydrodynamic Analysis Without Waterproofingsupporting

confidence: 76%

Produced water treatment by ceramic membrane: A numerical investigation by computational fluid dynamics

Magalhães

Lima

Neto

et al. 2017

Advances in Mechanical Engineering

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“…Shear stresses similar to the one tested in this work can be found in different industrial equipment, pipes and accessories (Ahmed et al, 2011;Konuklar and Gunasekaran, 2002;Lelièvre et al, 2002;Liu et al, 2006).…”

Section: Cell Adhesion and Biofilm Assayssupporting

confidence: 50%

The impact of material properties, nutrient load and shear stress on biofouling in food industries

Moreira

Gomes

Simões

et al. 2015

Food and Bioproducts Processing

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Abstract:In the food industry, biofilm formation in pipes, equipment and cooling systems increases maintenance costs, decreases operational efficiencies and is a source of contamination.Shear stress, nutrient load and surface material are important variables affecting the biofilm onset in industry. In this work, the combined impacts of these variables were assessed using three different materials (glass, copper and stainless steel), two nutrient loads (high and low nutrient medium) and two hydrodynamic conditions (static and dynamic). Initial adhesion and biofilm formation were studied in microplates usingEscherichia coli as a model organism.Surface material was the factor with the strongest impact and adhesion/biofilm formation were correlated with surface hydrophobicity. However, the impact of this variable was dependent on the nutrient load and imposed shear stress. It was also found that, for the majority of the situations tested, initial attachment performance is a good predictor of biofilm formation behaviour and that the effects observed during attachment are amplified during biofilm maturation. Since shear stress is a major determinant in cell adhesion, the results of this study may find application in industrial systems operating at flow rates between 0.001 and 600 m 3 h -1 depending on tube material and diameter.

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“…In the case of a membrane fitted with a blade mixer, the actual cross-flow velocity (v ac ) was calculated using CFD software and it is taken as the average cross-flow velocity over the volume of the membrane with blade mixer. The 3D simulation, supposing that the membrane wall is non-permeable, was performed [26]. This was possible because the permeate rate is usually much lower than the total flow rate in the feed channel so the wall suction does not influence on the flow field.…”

Section: Calculationsmentioning

confidence: 99%