scholarly journals Review of Transport Phenomena and Popular Modelling Approaches in Membrane Distillation

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 122 ◽  
Author(s):  
Yan Dong ◽  
Xiaodong Dai ◽  
Lianyu Zhao ◽  
Li Gao ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Driving Force ◽  
Transport Phenomena ◽  
Membrane Distillation ◽  
Membrane Interface ◽  
Inorganic Particles ◽  
Advantages And Disadvantages ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfers ◽  
Sweeping Gas ◽  
Modelling Approaches

In this paper, the transport phenomena in four common membrane distillation (MD) configurations and three popular modelling approaches are introduced. The mechanism of heat transfer on the feed side of all configurations are the same but are distinctive from each other from the membrane interface to the bulk permeate in each configuration. Based on the features of MD configurations, the mechanisms of mass and heat transfers for four configurations are reviewed together from the bulk feed to the membrane interface on the permeate but reviewed separately from the interface to the bulk permeate. Since the temperature polarisation coefficient cannot be used to quantify the driving force polarisation in Sweeping Gas MD and Vacuum MD, the rate of driving force polarisation is proposed in this paper. The three popular modelling approaches introduced are modelling by conventional methods, computational fluid dynamics (CFD) and response surface methodology (RSM), which are based on classic transport mechanism, computer science and mathematical statistics, respectively. The default assumptions, area for applications, advantages and disadvantages of those modelling approaches are summarised. Assessment and comparison were also conducted based on the review. Since there are only a couple of full-scale plants operating worldwide, the modelling of operational cost of MD was only briefly reviewed. Gaps and future studies were also proposed based on the current research trends, such as the emergence of new membranes, which possess the characteristics of selectivity, anti-wetting, multilayer and incorporation of inorganic particles.

scholarly journals Augmenting the distillate water flux of sweeping gas membrane distillation using turbulators: A numerical investigation

2021 ◽  
pp. 101180
Author(s):  
Mahmoud Badawy Elsheniti ◽  
Mohamed O. Elbessomy ◽  
Kareem Wagdy ◽  
Osama A. Elsamni ◽  
Mahmoud M. Elewa
Keyword(s):  
Numerical Investigation ◽  
Water Flux ◽  
Membrane Distillation ◽  
Sweeping Gas

Nature of flow on sweeping gas membrane distillation

2000 ◽  
Vol 170 (2) ◽  
pp. 243-255 ◽  
Author(s):  
Mohamed Khayet ◽  
Paz Godino ◽  
Juan I. Mengual
Keyword(s):  
Membrane Distillation ◽  
Sweeping Gas

scholarly journals Microfluidic and Micromachined/MEMS Devices for Separation, Discrimination and Detection of Airborne Particles for Pollution Monitoring

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 483 ◽  
Author(s):  
Daniel Puiu Poenar
Keyword(s):  
Optical Scattering ◽  
Pollution Monitoring ◽  
Detection Methods ◽  
Mems Devices ◽  
Micro Electro Mechanical Systems ◽  
Lab On Chip ◽  
Inorganic Particles ◽  
Advantages And Disadvantages ◽  
Air Quality Assessment ◽  
On Chip

Most of the microfluidics-related literature describes devices handling liquids, with only a small part dealing with gas-based applications, and a much smaller number of papers are devoted to the separation and/or detection of airborne inorganic particles. This review is dedicated to this rather less known field which has become increasingly important in the last years due to the growing attention devoted to pollution monitoring and air quality assessment. After a brief introduction summarizing the main particulate matter (PM) classes and the need for their study, the paper reviews miniaturized devices and/or systems for separation, detection and quantitative assessment of PM concentration in air with portable and easy-to-use platforms. The PM separation methods are described first, followed by the key detection methods, namely optical (scattering) and electrical. The most important miniaturized reported realizations are analyzed, with special attention given to microfluidic and micromachined or micro-electro-mechanical systems (MEMS) chip-based implementations due to their inherent capability of being integrated in lab-on-chip (LOC) type of smart microsystems with increased functionalities that can be portable and are easy to use. The operating principles and (when available) key performance parameters of such devices are presented and compared, also highlighting their advantages and disadvantages. Finally, the most relevant conclusions are discussed in the last section.

Computational study of sweeping gas membrane distillation process – Flux performance and polarization characteristics

Desalination ◽  
2020 ◽  
Vol 485 ◽  
pp. 114444 ◽  
Author(s):  
Umar F. Alqsair ◽  
Ahmed M. Alshwairekh ◽  
Anas M. Alwatban ◽  
Alparslan Oztekin
Keyword(s):  
Computational Study ◽  
Membrane Distillation ◽  
Distillation Process ◽  
Polarization Characteristics ◽  
Sweeping Gas

Transport phenomena in membrane distillation processes

2022 ◽  
pp. 111-128
Author(s):  
Jianhua Zhang ◽  
Jun-De Li ◽  
Zongli Xie ◽  
Xiaodong Dai ◽  
Stephen Gray
Keyword(s):  
Transport Phenomena ◽  
Membrane Distillation

Separation of binary mixtures by thermostatic sweeping gas membrane distillation

2002 ◽  
Vol 198 (2) ◽  
pp. 197-210 ◽  
Author(s):  
M.C Garcı́a-Payo ◽  
C.A Rivier ◽  
I.W Marison ◽  
U von Stockar
Keyword(s):  
Binary Mixtures ◽  
Membrane Distillation ◽  
Sweeping Gas

Comparison of Sweeping Gas and Direct Contact Membrane Distillation: Module Length Effect

2020 ◽  
Author(s):  
Umar F. Alqsair ◽  
Ahmed M. Alshwairekh ◽  
Anas M. Alwatban ◽  
Robert Krysko ◽  
Alparslan Oztekin
Keyword(s):  
Direct Contact ◽  
Three Dimensional ◽  
Concentration Field ◽  
Local Variation ◽  
Membrane Distillation ◽  
Membrane Properties ◽  
Effect Of Temperature ◽  
Vapor Flux ◽  
Direct Contact Membrane Distillation ◽  
Sweeping Gas

Abstract Computational fluid dynamics simulations are conducted to compare the effect of module length in sweeping gas and direct contact membrane distillation systems for seawater desalination processes. In this work, the effect of temperature and concentration on the flux performance and temperature and concentration polarization characteristics are studied. CFD simulations are conducted in a three-dimensional module to characterize the steady-state velocity, temperature, and concentration field in the feed and permeate channel. The Reynolds number for the feed and the permeate stream is set to 500 and 1500, and thus the laminar flow model is adapted for each channel. The membrane properties are fixed in all cases considered. It is revealed that the local variation of the vapor flux, TPC, and CPC varies with module length in SGMD systems. However, the average values along the membrane in both module lengths do not vary much. Remedies for mitigating temperature polarization should be considered for future studies.

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