Explore on Pressure-Drop Performance of Nanofibrous Filtration Membrane

2011 ◽  
Vol 236-238 ◽  
pp. 1885-1888
Author(s):  
Han Wang ◽  
Zuo Yi Yang ◽  
Jin Yong Liu ◽  
Gao Feng Zheng ◽  
Ling Min Chen
Keyword(s):  
Pressure Drop ◽  
Membrane Filtration ◽  
Filtration Efficiency ◽  
Nanofibrous Membrane ◽  
Air Filtration ◽  
Fibrous Filter ◽  
Filtration Membrane ◽  
Filtration Area ◽  
Change Trend ◽  
Resistance Performance

High filtration efficiency of nanofibrous membrane has been proved in air filtration area, but, in addition to filtration efficiency, pressure drop is another important characteristic of fibrous filter. Because pressure-drop is related to energy wastage of filtration, it’s necessary to study. While there are not enough studies dedicated to pressure-drop of nanofibrous membrane filters. Here, different thickness PVA nanofibrous membranes were made by electrospinning, and they deposited on cotton scaffolds to form nanofibrous filter samples. Through testing these samples, we found as thickness of nanofibrous membrane increased, pressure-drop rose almost linearly, while filtration efficiency presented a different change trend. When thickness of nanofibrous membrane reaching a point, filtration efficiency attained extreme limit, even if increasing thickness nanofibrous membrane, filtration efficiency only rose limitedly, but pressure-drop still increased rapidly. At the same time, we found despite the thickness of nanofibrous membrane was thinner than conventional fibrous filter, pressure-drop of nanofibrous filter was obviously higher than conventional fibrous filter. So it’s remarkable phenomena. Through theoretical analysis and simulation, the causation of high pressure-drop of nanofibrous filter was discussed and provided. Decreasing diameter of fiber caused resistance performance change. It’s necessary to carry on a further research.

Research on the Advantages of Nanofibrous Air Filtration Membrane

2011 ◽  
Vol 474-476 ◽  
pp. 2016-2019 ◽  
Author(s):  
Han Wang ◽  
Zuo Yi Yang ◽  
Jin Yong Liu ◽  
Gao Feng Zheng ◽  
Yin Ping Liu
Keyword(s):  
Small Diameter ◽  
Test System ◽  
Filtration Efficiency ◽  
Nanofibrous Membrane ◽  
Building Industry ◽  
Air Filtration ◽  
Pressure Drops ◽  
Filtration Membrane ◽  
Fibrous Filters ◽  
Professional Fields

When nanofibers could be made last century, its filtration potential was expected in a lot of professional fields, such as building industry, medical industry and Environmental protection industry. In the present study, in order to prove and explain its performances, nanofibrous membrane with given thickness was electrospun with 8% PVA solution on conventional cotton scaffold. Then by means of special air filtration test system, the filtration performances between PVA nanofibrous membrane and conventional fibrous filters were confirmed and compared. Besides, the filtration efficiencies of particles distribution 0.3-5um were attained, and at the same time, another important parameter, pressure-drops, could be observed, too. Through data analysis, the differences of filtration performances were verified. Despite the fact that nanofibrous membrane had higher pressure-drops, its filtration efficiency could reach startlingly 99% for some given particles. In succession, SEM was used to observe the particles distribution in filter, and the different filtration mechanisms were analyzed and discussed with SEMS images. Furthermore, we found that the direct inception and the inertial impact improved nanofiber filtration efficiency, while too small diameter of nanofiber induced higher pressure-drops. In general, nanofibers have huge value in air filtration application.

scholarly journals Self-Supporting Three-dimensional Electrospun Nanofibrous Membrane for Highly Efficient Air Filtration

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2567
Author(s):  
Gaofeng Zheng ◽  
Zungui Shao ◽  
Junyu Chen ◽  
Jiaxin Jiang ◽  
Ping Zhu ◽  
...  
Keyword(s):  
Pressure Drop ◽  
High Performance ◽  
Three Dimensional ◽  
Filtration Efficiency ◽  
Nanofibrous Membrane ◽  
Air Filtration ◽  
Fiber Morphology ◽  
Filtration Performance ◽  
Fibrous Filters ◽  
New Strategy

High-performance air filtration was the key to health protection from biological and ultrafine dust pollution. A self-supporting, three-dimensional (3D) nanofibrous membrane with curled pattern was electrospun for the filtration, of which the micro-fluffy structure displayed high-filtration efficiency and low-pressure drop. The flow field in the 3D filtration membrane was simulated to optimize the process parameters to increase the filtration performance. The qualification factor increased from 0.0274 Pa−1 to 0.0309 Pa−1 by 12.77% after the optimization of the electrospinning parameters. The best filtration efficiency and pressure drop were 93.6% and 89.0 Pa, separately. This work provides a new strategy to fabricate 3D structures through the construction of fiber morphology and promotes further improvement of air filtration performance of fibrous filters.

Characterization of glass fiber felt and its performance as an air filtration media

2020 ◽  
pp. 152808372096141
Author(s):  
Chi Zou ◽  
Yunlong Shi ◽  
Xiaoming Qian
Keyword(s):  
Pressure Drop ◽  
Glass Fiber ◽  
Separation Efficiency ◽  
Theoretical Calculations ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Slow Increase ◽  
Filter Materials ◽  
Fine Fiber

The glass fiber felt made through flame blowing process was characterized on morphology and its filtration performance. Fiber diameter has been measured through SEM and BET methods. Theoretical calculations on pressure drop and filtration efficiency were developed and compared with the experimental measurement. The discrepancy between the calculated results and measurement on filtration efficiency is derived from the presence of fine fiber (<0.5µm) in the glass fiber felt, which contributes to the actual high filtration efficiency in measurement. The multiple micro-layered structure in glass fiber felt, which improves the dust holding capacity and enables glass fiber felt as a depth filter. Glass fiber felt showed a longer duration of the slow increase region for pressure drop build-up comparing to other filter materials with lower averaged pressure drop through its filtration service life. Furthermore, quality factor calculation has been developed for prediction on the energy cost performance of the filters based on the pressure drop, separation efficiency and dust holding capacity.

Branched nanofibers with tiny diameters for air filtration via one-step electrospinning

2020 ◽  
pp. 152808372092377
Author(s):  
Bilal Zaarour ◽  
Hussen Tina ◽  
Lei Zhu ◽  
XiangYu Jin
Keyword(s):  
Sodium Chloride ◽  
Pressure Drop ◽  
Polyvinylidene Fluoride ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Air Filter ◽  
One Step ◽  
Tetrabutylammonium Chloride ◽  
Filtration Properties ◽  
Branched Structure

Engineering the surface morphology of fibers has been attracting significant consideration in various areas and applications. In this study, polyvinylidene fluoride (PVDF) branched nanofibers with a diameter of less than 50 nm are electrospun directly at a low relative humidity by adding tetrabutylammonium chloride. The effects of the branched structure on the specific surface area and pore size distribution are investigated, and the filtration properties of the air filter based on branched nanofiber webs with different basis weights are studied. The results exhibit that the air filter based on PVDF branched nanofibers with the basis weight of 1 g/m2 has an outstanding filtration efficiency (99.999%) to 0.26 µm sodium chloride particles under the pressure drop of 126.17 Pa. We believe that this study can be used as a useful reference for the preparation of branched nanofibers through one-step electrospinning.

Tunable Fabrication of Electrospun Polyvinyl Alcohol Nanofibrous Membrances for Effective Air Filtration

2017 ◽  
Vol 748 ◽  
pp. 423-427
Author(s):  
Jin Yu Zhao ◽  
Zhao Lin Liu ◽  
Ju Chuan Shan
Keyword(s):  
Pressure Drop ◽  
Polyvinyl Alcohol ◽  
Applied Voltage ◽  
Feed Rate ◽  
Low Pressure ◽  
Solution Concentration ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Performance

Polyvinyl alcohol (PVA) nanofibrous membrances for effective air filtration were fabricated by electrospinning. Tunable fiber morphologies can be formed by facilely regulating the solution concentration and the applied voltage, and their effect on filtration performance of the PVA membrances were also investigeted. Results show that the PVA membrance exhibits high filtration efficiency of 97.1% and low pressure drop of 113 Pa when the PVA concentration is 8 wt% and the applied voltage is 15 kV with a tip-to-collector distance of 15 cm and a feed rate of 1 ml/h.

Preparation and study of low-resistance polyacrylonitrile nano membranes for gas filtration

2016 ◽  
Vol 87 (2) ◽  
pp. 208-215 ◽  
Author(s):  
Li-Hua Lou ◽  
Xiao-Hong Qin ◽  
Hongnan Zhang
Keyword(s):  
Pressure Drop ◽  
Filtration Efficiency ◽  
Special Structure ◽  
Air Filtration ◽  
Gas Filtration ◽  
Low Resistance ◽  
Nanofiber Membranes ◽  
Nanofibrous Membranes ◽  
Bubble Template

In this paper, patterned nanofibrous membranes were fabricated for air filtration. Polyacrylonitrile was employed as the electrospinning material as its fluffy property and bulged bubble template served as collector to prepare the patterned membrane. With this special structure, the pressure drop significantly declined from 151.7 to 24.7 mmH2O, although the filtration efficiency of nanofiber membranes exhibited a slight decline from 99.94% to 96.33% compared to traditional electrospinning nanofibrous membranes. These sharp declines of the pressure drop while retaining the filtration efficiency imply that it could have more extensive applications.

scholarly journals Electrospun Nanofibre Filtration Media to Protect against Biological or Nonbiological Airborne Particles

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3257
Author(s):  
Fabrice N. H. Karabulut ◽  
Günther Höfler ◽  
Naveen Ashok Chand ◽  
Gareth W. Beckermann
Keyword(s):  
Pressure Drop ◽  
Filtration Efficiency ◽  
Weight Basis ◽  
Airborne Particles ◽  
Air Filtration ◽  
Filter Media ◽  
Ethylene Vinyl Alcohol ◽  
Electrospun Nanofibres ◽  
Level 1 ◽  
Level 2

Electrospun nanofibres can outperform their melt-blown counterparts in many applications, especially air filtration. The different filtration mechanisms of nanofibres are particularly important when it comes to the air filtration of viruses (such as COVID-19) and bacteria. In this work, we present an electrospun nanofibre filter media, FilterLayrTM by NanoLayr Ltd., containing poly(methyl methacrylate)/ethylene vinyl alcohol nanofibres. The outstanding uniformity of the nanofibres was indicated by the good correlation between pressure drop (ΔP) and areal weight with R2 values in the range of 0.82 to 0.98 across various test air velocities. By adjusting the nanofibre areal weight (basis weight), the nanofibre filter media was shown to meet the particle filtration efficiency and breathability requirements of the following internationally accepted facemask and respirator standards: N95 respirator facemask performance in accordance with NIOSH 42CFR84 (filtration efficiency of up to 98.10% at a pressure drop of 226 Pa and 290 Pa at 85 L·min−1 and 120 L·min−1, respectively), Level 2 surgical facemask performance in accordance with ASTM F2299 (filtration efficiency of up to 99.97% at 100 nm particle size and a pressure drop of 44 Pa at 8 L·min−1), and Level 2 filtration efficiency and Level 1 breathability for barrier face coverings in accordance with ASTM F3502 (filtration efficiency of up to 99.68% and a pressure drop of 133 Pa at 60 L·min−1), with Level 2 breathability being achievable at lower nanofibre areal weights.

Liquid-mediated particle capture by nonwoven filter media for automotive engine intake air filtration

2021 ◽  
pp. 152808372110610
Author(s):  
Shivendra Yadav ◽  
Dipayan Das
Keyword(s):  
Pressure Drop ◽  
Polypropylene Fiber ◽  
Nonwoven Fabric ◽  
Filtration Efficiency ◽  
Engine Oil ◽  
Air Filtration ◽  
Dust Deposition ◽  
Filter Media ◽  
Air Filter ◽  
Automotive Engine

This article reports on development, characterization, and performance of liquid-treated nonwoven air filter media for automotive engine intake application. A polypropylene fiber-based needle-punched nonwoven fabric was prepared for treatment with four viscous liquids (glycerol, SAE 20W/50 engine oil, PEG 400, and deionized water) by liquid spraying technique. The filtration performance was evaluated in terms of initial and final gravimetric filtration efficiencies, fractional filtration efficiency, evolution of pressure drop, and dust holding capacity. The liquid-treated filter media registered higher gravimetric as well as fractional filtration efficiency and higher dust holding capacity as compared to the untreated ones. The initial and final gravimetric filtration efficiencies were found to be directly related to liquid add-on via a power law relationship. The liquid-treated filter media also exhibited higher fractional filtration efficiency than their untreated counterparts for all sizes of tested particles. Interestingly, the increase of fractional efficiency was more for smaller particles as compared to larger ones. This was explained quantitatively through single fiber efficiency due to adhesion. The viscosity of liquid was found to be a very crucial parameter as the dust deposition morphology was contingent to the flow of liquid onto the filter media. The stickiest liquid yielded highest filtration efficiencies, displayed slowest rise of pressure drop, and exhibited highest dust holding capacity.

scholarly journals Hierarchical Structured Polyimide–Silica Hybrid Nano/Microfiber Filters Welded by Solvent Vapor for Air Filtration

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2494
Author(s):  
Dawei Li ◽  
Ying Shen ◽  
Lanlan Wang ◽  
Feng Liu ◽  
Bingyao Deng ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Fine Particulate Matter ◽  
Sio2 Nanoparticles ◽  
Filtration Efficiency ◽  
The Body ◽  
Slight Reduction ◽  
Air Filtration ◽  
Electrospun Membrane ◽  
Solvent Vapor ◽  
Vapor Treatment

Electrospun polymer membranes were considered to be promising materials for fine particulate matter (PM) filtration. However, the poor mechanical properties of the electrospun membrane restricted their application for pressure-driven air filtration. Herein, strength-enhanced electrospun polyimide (PI) membranes were demonstrated via a synergistic approach. Solvent-vapor treatment was utilized to introduce extra bonding at the cross points of PI nanofiber, while SiO2 nanoparticles (SiO2 NPs) were used to reinforce the body of nanofibers. The mechanical strength and filtration performance of hybrid membranes could be regulated by adjusting the quantity of SiO2 NPs. The tensile strength of the pure PI membrane was increased by 33% via adding 1.5% SiO2 NPs, which was further promoted by 70% after solvent-vapor treatment. With a slight reduction in pressure drop (6.5%), the filtration efficiency was not greatly suppressed by welding the SiO2 NP hybrid PI nanofibers. Moreover, the welded composite filter showed high particulate (0.3–1.0 μm) filtration efficiency (up to nearly 100%) and stable pressure drop throughout the 20 tested filtration cycles.

Residual Pressure Drop Using ePTFE Micro-Filtration Membrane as Filter Medium

2006 ◽  
Vol 11-12 ◽  
pp. 701-704
Author(s):  
Jun Teng Liu ◽  
Zhong Qi Ren ◽  
Wei Dong Zhang ◽  
De Qiang Jiang ◽  
Jian Chun Zhang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
High Efficiency ◽  
Filter Medium ◽  
Dust Removal ◽  
Residual Pressure ◽  
Air Filtration ◽  
Filtration Membrane ◽  
Surface Filtration ◽  
Residual Pressure Drop ◽  
Filtration Medium

Filtration medium is one of the most important parts of air-filtration. A Micro-filtration membrane made by expanded poly-tetra-fluoric-ethylene (ePTFE) was introduced in the dust removal process in our previous work. Compared with conventional fabric media, ePTFE membrane has many advantages, such as low residual pressure drop and high efficiency of dust removal, etc., because of its characteristics of micro-porous structure and slippery surface. More importantly, the useful life of ePTFE membrane is longer and the operating costs are lower during the surface-filtration process. In this paper, the residual pressure drop of the ePTFE micro-filtration membrane and conventional needle-felts fabric filtration medium were compared. The results clearly show that the residual pressure drop of the conventional filter medium increases after several filtration cycles, but that of the ePTFE membrane remains constant.

Sign in / Sign up

Export Citation Format

Share Document