The impact of baffle orientation on the performance of the hollow fiber membrane distillation

Mabrouk, Abdel Nasser; Elhenawy, Yasser; Abdelkader, Mohamed; Shatat, Mohammad A.

doi:10.5004/dwt.2017.0030

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Figure 13 depicts the influence of feed temperature ( T bf ) on polarization coefficients (TPC). In general, temperature polarization coefficients decreased with T bf [ 1 , 20 , 36 , 44 ]. At greater temperatures, vaporization consumes more energy, which might explain this truth.…”

Section: Resultsmentioning

confidence: 99%

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Theoretical Investigation of Vapor Transport Mechanism Using Tubular Membrane Distillation Module

Alanezi

Bassyouni

Abdel-Hamid³

et al. 2021

Membranes

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This paper’s primary objective is to examine the vapor delivery mechanism through a tubular membrane distillation (MD) module. Experiments were conducted utilizing a hydrophobic tubular membrane module with a pore size of 0.2 µm. To establish the mass transport mechanism of water vapor, tests were carried out first with pure water as a feed. The permeate flow was then determined using NaCl aqueous feed solutions. Distilled water flux at diverse feed temperatures, feed flow rates, and feed salt concentrations was investigated. The permeate flux improved linearly with rising temperature and flow rate of the feed, however, it declined with feed concentration. Increasing temperature from 40 to 70 °C increased the permeate flux by a factor of 2.2, while increasing the feed flow rate from 60 to 120 L/h increased the permeate flux by a factor ranging from 0.7 to 1.1 depending on feed temperature. Using the Dusty gas model (DGM) the mass transport of water vapor is estimated in the membrane pores. The results showed that the water vapor delivery is controlled by way of the Knudsen molecular diffusion transition mechanism and its version changed into one capable of predicting the permeate fluxes. The mass transfer coefficient calculated and located using the Knudsen molecular transition version agreed properly with the corresponding experimental value. The delivery resistances were affected by working parameters, along with feed temperature, flow rate, and concentration. The mass transfer resistance of the membrane became the predominant controlling step to the MD process.

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Section: Resultsmentioning

confidence: 99%

“…The thermal efficiency (η) of the process is defined as the ratio of the amount of heat evaporation to the total heat flux of Equation (5). Therefore, η can be expressed as [ 36 ]:

…”

Section: Methodsmentioning

confidence: 99%

Theoretical Investigation of Vapor Transport Mechanism Using Tubular Membrane Distillation Module

Alanezi

Bassyouni

Abdel-Hamid³

et al. 2021

Membranes

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show abstract

“…Since k-ε models have been validated and found reliable for various MD configurations (AGMD, DCMD and VMD) [27][28][29][30][31][32], the realizable two-layer k-model was applied to model the turbulent flow in the feed and permeate channels. A turbulent eddy-viscosity was considered as a function of the turbulent kinetic energy (k) and turbulent dissipation rate ( ) terms in the model [33].…”

Section: Governing Transport Equations In the Cfd Modelmentioning

confidence: 99%

Computational fluid dynamics modeling for performance assessment of permeate gap membrane distillation

Yazgan‐Birgi

Ali

Swaminathan

et al. 2018

Journal of Membrane Science

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“…Membrane distillation (MD), in particular, have some exclusive advantages over other membrane purification technologies in that the removal of nonvolatile contaminants is 100%, lower operating pressure than other pressure-dependent membrane separation techniques, and lower operating temperature than other thermal desalination technologies. MD is a thermally driven membrane separation technique in which only vapor molecules transfer through a highly porous, thermally stable, hydrophobic membrane due to the vapor pressure difference that is initiated originally from temperature difference on both sides of the membrane [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fabricated MWCNTs/Polystyrene Nanofibrous Membrane for DCMD

et al. 2021

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The effect of compositing multiwalled carbon nanotubes (MWCNTs) with polystyrene (PS) to fabricate nanofibrous membrane by electrospinning technique and comparing the direct contact membrane distillation (DCMD) performance of the blank and composite membranes is evaluated numerically. Surface morphology of both the pristine and the composite membrane was studied by SEM imaging while the average fiber diameter and average pore size were measured using ImageJ software. Static water contact angle and porosities were also determined for both membranes. Results showed significant enhancement in both the hydrophobicity and porosity of the composite membrane by increasing the static water contact angle from 145.4° for the pristine PS membrane to 155° for the PS/MWCNTs composite membrane while the porosity was increased by 28%. Simulation results showed that at any given feed inlet temperature, the PS/MWCNTs membrane have higher permeate flux and better overall system performance.

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The impact of baffle orientation on the performance of the hollow fiber membrane distillation

Cited by 19 publications

References 17 publications

Theoretical Investigation of Vapor Transport Mechanism Using Tubular Membrane Distillation Module

Theoretical Investigation of Vapor Transport Mechanism Using Tubular Membrane Distillation Module

Computational fluid dynamics modeling for performance assessment of permeate gap membrane distillation

Numerical Investigation of Fabricated MWCNTs/Polystyrene Nanofibrous Membrane for DCMD

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