Improving the performance of direct contact membrane distillation utilizing spacer-filled channel

Taamneh, Yazan; Bataineh, Kahled

doi:10.1016/j.desal.2017.01.004

Cited by 82 publications

(29 citation statements)

References 26 publications

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“…The friction factor decreased when the porosity increased; however, the amplitude gradually became smaller, as shown in Figure 7. Moreover, from the contours of total pressure shown in Figure 10, the higher filament diameter generated a higher friction factor linked to the filament drag, and this was described as the drag coefficient in previous studies [45,46]. Moreover, the Haaksman et al experimental friction factor results for the commercial spacers were added to Figure 9 [23].…”

Section: Friction Factor and The Dimensionless Power Numbermentioning

confidence: 96%

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CFD Investigation of the Effect of the Feed Spacer on Hydrodynamics in Spiral Wound Membrane Modules

Han

Terashima

Liu

et al. 2018

MCA

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Spacers are designed to create a feed channel, but they are also obstacles to the flow in spiral wound membrane modules. The geometry of the feed spacer influences the flow pattern, which was investigated by using a three-dimensional Computational Fluid Dynamics (CFD) model. For the conventional feed spacer, unavoidable disadvantages were caused by its line contact with the membrane. The pillar-like feed spacer was designed to achieve area contact, which made it possible to enhance the porosity and minimize the adverse effects from the dead zone caused by the transverse filament. Through reductions in the connecting filament’s diameter, the channel porosity reached 0.979. Regarding the maximum porosity, the dimensionless power number was reduced by 47.31% at Reynolds number 150 in comparison with a previously studied commercial spacer. Furthermore, a modified friction factor, as a dimensionless parameter, was employed to investigate the shear stress at the membrane’s surface. At dimensionless power number 106, the enhancement of the modified friction factor increased by approximately 22.27% in comparison with the results of a previous study. Based on the numerical prediction, the homogenization of shear stress distribution, which changed the flow profile near the membrane, was featured through contour plots.

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Section: Friction Factor and The Dimensionless Power Numbermentioning

confidence: 96%

“…described as the drag coefficient in previous studies [45,46]. Moreover, the Haaksman et al experimental friction factor results for the commercial spacers were added to Figure 9 [23].…”

Section: Friction Factor and The Dimensionless Power Numbermentioning

confidence: 99%

CFD Investigation of the Effect of the Feed Spacer on Hydrodynamics in Spiral Wound Membrane Modules

Han

Terashima

Liu

et al. 2018

MCA

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“…5 Calculate the latent heat of vaporization at the average membrane temperature using Equation (17). 6 Compute the overall heat transfer coefficient using Equation (20). 7 At equilibrium, Equation (21) holds.…”

Section: Appendix a Algorithm A1mentioning

confidence: 99%

Understanding and enhancing the direct contact membrane distillation performance by modified heat transfer correlation

2020

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The sensitivity of direct contact membrane distillation to feed temperatures and feed flow rate is investigated experimentally. At very low flow rates, the process becomes heat transfer limited where the thermal energy of the aqueous feed solution is lost by the conduction resistance minimizing the distillate production. At high flow rates, the film heat transfer coefficient for both liquid solutions increases, creating a larger temperature difference across the membrane boundaries. Hence, the mass fluxes increase linearly with the water flow rate. These findings are also assessed by simulating the heat and mass transfer equations that describe the membrane distillation (MD) thermo-physical operation. It is found that the underlying physics of the MD module must faithfully capture and explain the true process behaviour. Hence, a modified correlation for the Nusselt number is developed and tested.

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“…Taamneh Y.and Bataineh K. [80] improved the performance of direct contact membrane distillation by utilizing a spacer-filled channel. The impact of the spacer filament's orientation on the flow pattern in a direct contact membrane distillation module was examined numerically using computational fluid dynamic simulations and by experiment.…”

Section: -2-1 Modification Of Feed Spacer Designmentioning

confidence: 99%

A review of efforts to reduce membrane fouling by control of feed spacer characteristics

et al. 2017

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Improving the performance of direct contact membrane distillation utilizing spacer-filled channel

Cited by 82 publications

References 26 publications

CFD Investigation of the Effect of the Feed Spacer on Hydrodynamics in Spiral Wound Membrane Modules

CFD Investigation of the Effect of the Feed Spacer on Hydrodynamics in Spiral Wound Membrane Modules

Understanding and enhancing the direct contact membrane distillation performance by modified heat transfer correlation

A review of efforts to reduce membrane fouling by control of feed spacer characteristics

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