Modeling of Conjugated Heat Transfer in Direct‐Contact Membrane Distillation of Seawater Desalination Systems

Ho, Chii‐Dong; Yang, Tz-Jin; Wang, B.-C.

doi:10.1002/ceat.201100586

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…The applicability, validity, and robustness of the FEM for the type of domain encountered in the present work have been demonstrated previously by a number of authors [15][16][17][18][19][20][21]. A grid independence test indicated that the optimum numbers of meshes were 10 064 for numerical simulation [22][23][24][25]. Tab.…”

Section: Numerical Solution Of Model Equationssupporting

confidence: 65%

3D Modeling and Simulation of Mass Transfer in Vapor Transport through Porous Membranes

Shirazian

Ashrafizadeh

2012

Chem Eng & Technol

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A 3D mathematical model is developed to predict the transport of water vapor through porous membranes. The model is based on solving the continuity, momentum as well as energy equations for water in the membrane contactor. The model's equations are numerically solved using the finite element method to obtain the concentration and temperature distributions of water in the membrane contactor. The model findings were in good agreement with experimental data. The proposed 3D model proved to be appropriate for predicting the performance of a membrane evaporator. Simulations were carried out in order to study the influence of different operating parameters and membrane structure on the membrane evaporation effectiveness. The results of simulation indicate that the gas velocity is a favorable parameter in the membrane evaporation process due to its tendency to keep the process far from the thermodynamic equilibrium.

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Section: Numerical Solution Of Model Equationssupporting

confidence: 65%

3D Modeling and Simulation of Mass Transfer in Vapor Transport through Porous Membranes

Shirazian

Ashrafizadeh

2012

Chem Eng & Technol

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“…Because it is in equilibrium with the liquid phase, a lower temperature on the feed side causes the partial vapor pressure to decrease, while a higher temperature on the permeate side causes the partial pressure to increase. The authors in [40] reported that the effect of initial saline temperature on the hot feed stream regarding pure water productivity is more significant than that of the hot and cold feed stream velocity variations.…”

Section: Effect Of Pulsating On the Temperature Polarization Of Bulk ...mentioning

confidence: 99%

“…Temperature polarization is one of the key problems with the MD membrane, and when it comes to the bundle of hollow fibers on the MD membrane, it is quite challenging to calculate precise temperature polarization. Many scientists have predicted temperature polarization, maybe in light of the experimental study in [40] where a series of electrical sensors were used to predict the experimental and theoretical temperature polarization of DCMD. Besides that, the majority of them demonstrated that the bulk feed and permeate solutions' temperatures (T f and T p ) varied from one another [24,41].…”

Section: Effect Of Pulsating On the Temperature Polarization Of Bulk ...mentioning

confidence: 99%

Fouling Mitigation in Membrane Distillation Using Pulsation Flow Technique

Abulkhair,

Moujdin,

Kaddoura

et al. 2023

Processes

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The main obstacles to scaling up membrane distillation (MD) on a commercial level are membrane fouling and temperature polarization. Therefore, in this study, the significance of the pulsation feed flow phenomenon was used for membrane distillation (DCMD) polarization, and comparisons were made using steady-state feed flow. Two different Hertz and amplitudes of pulsation feed flow trends were used in DCMD using different sources of water, including distilled water, seawater, and wastewater. Compared to steady-state feed flow, the results revealed that flux was enhanced for seawater once the operating flow became turbulent, and it enhanced even more once the flow rate was increased and the turbulence flow was moved. For wastewater, pulsation in the feed flow had an impact on delaying the beginning of the flux decline point and enhancing the overall freshwater recovery. In both pulsation feed flows (1 and 2 Hertz), the results also revealed a deficiency in fouling and an improvement in the temperature distribution in the feed channel for seawater desalination and wastewater running under typical operational conditions. Taking this value into consideration, an enhancement in mass flux (~5–10%) was observed compared to steady-state feed flow. Moreover, the pulsation feed channels were found to reduce CPC by about 10–15%, proving the role of turbulence in mixing the flow and mitigating the reduction in concentration polarization.

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“…By combining Eqs. (1), (5)-(8) and rearranging, the following expressions for T mf and T mp can be obtained (Bouguecha et al 2003;Ho et al 2012):…”

Section: Modelling the Mass And Heat Transfer Phenomena In Dcmdmentioning

confidence: 99%

Computational and experimental study for the desalination of petrochemical industrial effluents using direct contact membrane distillation

2019

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The petrochemical, mining and power industries have reacted to the recent South African water crisis by focussing on improved brine treatment for water and salt recovery with the aim of achieving zero liquid effluent discharge. The purpose of this novel study was to compare experimentally obtained results from the treatment of synthetic NaCl solutions and petrochemical industrial brines such as spent ion exchange regenerant brines and reverse osmosis (RO) brines to the classical well-known Knudsen diffusion, molecular diffusion and transition predictive models. The predictive models were numerically solved using a developed mathematical algorithm that was coded using MATLAB ® software. The impact of experimentally varying the inlet feed temperature on process performance of the system is presented here and compared to simulated results. It was found that there was good agreement between the experimentally obtained results, for both the synthetic NaCl solution and the industrial brines. The mean average percentage error (MAPE) was found to be 7.9% for the synthetic NaCl solutions when compared to the Knudsen model. The Knudsen/molecular diffusion transition theoretical model best predicted the performance of the membrane for the industrial spent ion exchange regenerant brine with a mean absolute percentage error (MAPE) of 13.3%. The Knudsen model best predicted the performance of the membrane (MAPE of 10.5%) for the industrial RO brine. Overall, the models were able to successfully predict the water flux and can be used as potential process design tools.

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Modeling of Conjugated Heat Transfer in Direct‐Contact Membrane Distillation of Seawater Desalination Systems

Cited by 4 publications

References 21 publications

3D Modeling and Simulation of Mass Transfer in Vapor Transport through Porous Membranes

3D Modeling and Simulation of Mass Transfer in Vapor Transport through Porous Membranes

Fouling Mitigation in Membrane Distillation Using Pulsation Flow Technique

Computational and experimental study for the desalination of petrochemical industrial effluents using direct contact membrane distillation

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