Fine/ultrafine particle air filtration and aerosol loading of hollow-fiber membranes: A comparison of mathematical models for the most penetrating particle size and dimensionless permeability with experimental data

Bulejko, Pavel; Krištof, Ondřej; Dohnal, Mirko; Svěrák, Tomáš

doi:10.1016/j.memsci.2019.117393

Cited by 20 publications

(15 citation statements)

References 77 publications

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“…The particles in this case collide directly with the fiber surface [ 93 ]. Interception can occur when particles in the streamlines, are not far enough from the surface of a fiber and the radius of the particles are larger than the distance between the corresponding streamline and the fiber surface [ 94 ]. When a particle leaves its original path or streamline due to sufficient kinetic energy providing Brownian motion, diffusion begins.…”

Section: Air Filtration Mechanismsmentioning

confidence: 99%

Electrospun Nanofiber Mats for Filtering Applications—Technology, Structure and Materials

2021

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Air pollution is one of the biggest health and environmental problems in the world and a huge threat to human health on a global scale. Due to the great impact of respiratory viral infections, chronic obstructive pulmonary disease, lung cancer, asthma, bronchitis, emphysema, lung disease, and heart disease, respiratory allergies are increasing significantly every year. Because of the special properties of electrospun nanofiber mats, e.g., large surface-to-volume ratio and low basis weight, uniform size, and nanoporous structure, nanofiber mats are the preferred choice for use in large-scale air filtration applications. In this review, we summarize the significant studies on electrospun nanofiber mats for filtration applications, present the electrospinning technology, show the structure and mechanism of air filtration. In addition, an overview of current air filtration materials derived from bio- and synthetic polymers and blends is provided. Apart from this, the use of biopolymers in filtration applications is still relatively new and this field is still under-researched. The application areas of air filtration materials are discussed here and future prospects are summarized in conclusion. In order to develop new effective filtration materials, it is necessary to understand the interaction between technology, materials, and filtration mechanisms, and this study was intended to contribute to this effort.

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Section: Air Filtration Mechanismsmentioning

confidence: 99%

Electrospun Nanofiber Mats for Filtering Applications—Technology, Structure and Materials

2021

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“…The possibility of using renewable energy sources, such as waste heat, solar energy, or geothermal energy, may allow the integration of membrane distillation with other processes, making it more favorable energy-wise and therefore promising on an industrial scale [ 4 , 5 ]. Another possible use of the polymeric hollow fiber membrane is for aerosol or gas filtration [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Fully Polymeric Distillation Unit Based on Polypropylene Hollow Fibers

et al. 2021

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Access to pure water is a very topical issue today. Desalination represents a promising way of obtaining drinking water in areas of shortage. Currently, efforts are being made to replace the metal components of existing desalination units due to the high corrosivity of sea water. Another requirement is easy transportation and assembly. The presented solution combines two types of polymeric hollow fibers that are used to create the distillation unit. Porous polypropylene hollow fiber membranes have been used as an active surface for mass transfer in the distillation unit, while non-porous thermal polypropylene hollow fibers have been employed in the condenser. The large active area to volume ratio of the hollow fiber module improves the efficiency of both units. Hot water is pumped inside the membranes in the distillation unit. Evaporation is first observed at a temperature gradient of 10 °C. The water vapor flows through the tunnel to the condenser where cold water runs inside the fibers. The temperature gradient causes condensation of the vapor, and the condensate is collected. The article presents data for hot water at temperatures of 55, 60, and 65 °C. Optimization of the membrane module is evaluated and presented.

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“…Most of the studies about this issue often aimed at hollow-fiber membranes in terms of materials science and engineering, i.e., their manufacturing from different materials using various preparation techniques and characterization on filtration efficiency and pressure drop. Some works tried to do some mathematical modelling related to this issue [ 6 , 7 ]. However, only two works fully focused on pressure drop evolution during particle loading at different experimental conditions [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Bulejko

Krištof²,

Dohnal³

2021

Membranes

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In this work, we tried to analyze dust loading behavior of polypropylene hollow fiber membranes using average pressure drop models. Hollow fiber membranes varying in fiber diameter were loaded with a standardized test dust to simulate particle-polluted air. We measured pressure drop development of the membranes at different flowrates and dust concentrations, and, after each experiment, the dust deposited on the membrane fibers was weighed to obtain dust holding capacity (DHC). The obtained experimental data was analyzed using various average pressure drop models and compared with average pressure drop obtained from pressure drop/dust load dependence using a curve fit. Exponential and polynomial fitting was used and compared. Pressure drop in relation to the dust load followed different trends depending on the experimental conditions and inner fiber diameter. At higher flowrate, the dependence was polynomial no matter what the fiber diameter. However, with higher fiber diameter at lower permeate velocities, the dependence was close to exponential curve and followed similar trends as observed in planar filter media. Dust-holding capacity of the membranes depended on the experimental conditions and was up to 21.4 g. However, higher dust holding capacity was impossible to reach no matter the experiment duration due to self-cleaning ability of the tested membranes.

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Fine/ultrafine particle air filtration and aerosol loading of hollow-fiber membranes: A comparison of mathematical models for the most penetrating particle size and dimensionless permeability with experimental data

Cited by 20 publications

References 77 publications

Electrospun Nanofiber Mats for Filtering Applications—Technology, Structure and Materials

Electrospun Nanofiber Mats for Filtering Applications—Technology, Structure and Materials

Fully Polymeric Distillation Unit Based on Polypropylene Hollow Fibers

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

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