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Hoch D, Weber A, Niessner J. Modeling and Simulation of Coalescence in the Context of Oil Mist Filtration. Transp Porous Media 2023. [DOI: 10.1007/s11242-023-01908-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
AbstractToday, aerosols are generated in many industrial processes like machining or in pneumatic compressors. The harmfulness of these droplets often lies in the liquid itself, as it can be toxic or cancerous while exhaled natural aerosols can carry pathogens. For health protection, the filtration of these aerosols is an important task. The wetting properties of the fibers have a large influence on the filtration efficiency and coalescence of droplets on the fibers. Oleophilic fibers are better in capturing the oil particles, while drainage increases using oleophobic fibers. For improved efficiency and drainage properties, a mixed-wet fiber system could therefore be advantageous. Describing droplet capture and coalescence in filter-scale simulations is computationally extremely demanding. We present a new approach for simulating oil mist deposition and droplet coalescence, specifically accounting for the wettability of the fibers, especially for mixed-wet filter media. The aim is to gain a more realistic pressure loss of a fibrous filter structure which takes the presence of the filtered phase into account as well as the coalescence of the liquid phase on the fibers depending on the wettability and the fluid parameters. Our approach is to model the shape of deposited droplets via weighted distance maps, according to the contact angles. Starting from a sphere, the shape is fitted on the solid surface such that the contact angle is met. For validation purposes, volume-of-fluid-based simulations were set up using the same droplet-fiber system as a reference to compare the droplet shape and pressure loss in the presence of oil droplets on the fiber surface.
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Straube C, Meyer J, Dittler A. Investigation of the local oil distribution on oleophilic mist filters applying X-ray micro-computed tomography. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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3
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Influence of 3D printed downstream support structures on pressure drop and entrainment of oleophilic and oleophobic oil mist filters. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Optical investigations into wetted commercial coalescence filter using 3D micro-computer-tomography. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Bémer D. Granular bed filtration of a liquid aerosol. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.09.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Holweger HJ, Jamali M, Tafreshi HV. Centrifugal Detachment of Compound Droplets from Fibers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:928-938. [PMID: 33398995 DOI: 10.1021/acs.langmuir.0c03317] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This article presents the first experimental-computational study on the centrifugal detachment of a compound droplet (e.g., a primary water droplet cloaked by an immiscible oil) from a fiber. The work was intended to establish a method for quantifying the force needed to detach compound droplets of different compositions from a fiber. More importantly, our study was aimed at improving the understanding of the interplay between interfacial and external forces acting on a compound droplet during forceful detachment. The experiments were conducted using DI water, for the primary droplet, and silicone or mineral oil, for the cloaking fluid. It was observed from the experiments that the silicone-oil-cloaked droplets behave differently from the mineral-oil-cloaked droplets. It was also observed that detachment force decreases with increasing the oil-to-water volume ratio. The simulations were performed using the Surface Evolver (SE) finite element code programmed for the complicated four-phase (air, water, oil, and solid) interfacial problem at hand. Our simulations revealed the evolution of the interfacial forces between the interacting phases under an increasing external body force on the droplet. The simulations also allowed us to define effective interfacial tensions and contact angles for detaching compound droplets, for the first time. Reasonable agreement was observed between the experimental measurements and computational results.
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Affiliation(s)
- H J Holweger
- Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, Virginia 23284-3015, United States
| | - M Jamali
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695-7910, United States
| | - H Vahedi Tafreshi
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695-7910, United States
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Azarafza A, King A, Mead-Hunter R, Schuler J, Abishek S, Mullins B. Prediction of residual saturation and pressure drop during coalescence filtration using dynamic pore network model. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117588] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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8
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Hoch D, Azimian M, Baumann A, Behringer J, Niessner J. Comparison of Voxel‐Based and Mesh‐Based CFD Models for Aerosol Deposition on Complex Fibrous Filters. Chem Eng Technol 2020. [DOI: 10.1002/ceat.202000318] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dennis Hoch
- Heilbronn University of Applied Sciences Institute of Flow in Additively Manufactured Porous Media (ISAPS) Max-Planck-Strasse 39 74081 Heilbronn Germany
| | - Mehdi Azimian
- Math2Market GmbH Richard-Wagner-Strasse 1 67655 Kaiserslautern Germany
| | - André Baumann
- Heilbronn University of Applied Sciences Institute of Flow in Additively Manufactured Porous Media (ISAPS) Max-Planck-Strasse 39 74081 Heilbronn Germany
| | - Jens Behringer
- Heilbronn University of Applied Sciences Institute of Flow in Additively Manufactured Porous Media (ISAPS) Max-Planck-Strasse 39 74081 Heilbronn Germany
| | - Jennifer Niessner
- Heilbronn University of Applied Sciences Institute of Flow in Additively Manufactured Porous Media (ISAPS) Max-Planck-Strasse 39 74081 Heilbronn Germany
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Liu R, Zhou G, Wang C, Jiang W, Wei X. Preparation and performance characteristics of an environmentally-friendly agglomerant to improve the dry dust removal effect for filter material. JOURNAL OF HAZARDOUS MATERIALS 2020; 397:122734. [PMID: 32402956 DOI: 10.1016/j.jhazmat.2020.122734] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/20/2020] [Accepted: 04/12/2020] [Indexed: 06/11/2023]
Abstract
The incomplete and uneven dust removal of a pulse filter greatly reduces the dust removal efficiency, which affects the efficiency, service life, and running resistance of dust removers. Therefore, due to improve the pulse cleaning effect, an agglomerant developed by free radical polymerization was added during dust removal. The optimal process conditions were determined by measuring the viscosity, surface tension, and atomization effect of the agglomerant solution. The phases, chemical composition, surface morphology, and morphology of the agglomerant and coal dust were characterized by infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy. Molecular dynamics simulations were used to study the interaction mechanism between the agglomerant and coal dust. Finally, the dust removal performance under water mist conditions and agglomerate solution atomization was tested using a pulse filter. The results showed that a 0.3 % agglomerant solution effectively reduced the surface tension of the solution and displayed good wetting and bonding properties. Compared with water misting, the agglomerant solution subjected to an atomization rate of 2400 m3/h prolonged the filtration period, reduced the filtration resistance, and reduced the dust emission concentration. These results have important theoretical and practical significance for improving the dust removal effect of pulse filters.
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Affiliation(s)
- Rulin Liu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
| | - Gang Zhou
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China.
| | - Cunmin Wang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
| | - Wenjing Jiang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
| | - Xing Wei
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
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Kamiński M, Gac JM, Sobiech P, Kozikowski P, Jakubiak S. Filtration of aerosols containing graphite nanoparticles or their mixture with water droplets on single and multi-layer fibrous filters. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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A novel energy-efficient kapok filter paper with high DHC for solid-oil mixed aerosol: Performance and loading behavior evolution mechanism. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116180] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Wang LY, Yu LE, Chung TS. Effects of relative humidity, particle hygroscopicity, and filter hydrophilicity on filtration performance of hollow fiber air filters. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117561] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Penner T, Meyer J, Kasper G, Dittler A. Impact of operating conditions on the evolution of droplet penetration in oil mist filters. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.10.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Liu Z, Ji Z, Shang J, Chen H, Liu Y, Wang R. Improved design of two-stage filter cartridges for high sulfur natural gas purification. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.05.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Chang C, Ji Z, Liu J. The effect of a drainage layer on the saturation of coalescing filters in the filtration process. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2016.10.047] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Liu Z, Ji Z, Wu X, Ma H, Zhao F, Hao Y. Experimental investigation on liquid distribution of filter cartridge during gas-liquid filtration. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.06.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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20
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Oil mist collection and oil mist-to-gas conversion via dielectric barrier discharge at atmospheric pressure. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.07.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Wurster S, Kampa D, Meyer J, Müller T, Mullins B, Kasper G. Measurement of oil entrainment rates and drop size spectra from coalescence filter media. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2015.04.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Gac JM. A simple numerical model of pressure drop dynamics during the filtration of liquid aerosols on fibrous filters. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2015.1014496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Li P, Wang C, Zhang Y, Wei F. Air filtration in the free molecular flow regime: a review of high-efficiency particulate air filters based on carbon nanotubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:4543-61. [PMID: 25288476 DOI: 10.1002/smll.201401553] [Citation(s) in RCA: 139] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 07/25/2014] [Indexed: 05/27/2023]
Abstract
Air filtration in the free molecular flow (FMF) regime is important and challenging because a higher filtration efficiency and lower pressure drop are obtained when the fiber diameter is smaller than the gas mean free path in the FMF regime. In previous studies, FMF conditions have been obtained by increasing the gas mean free path through reducing the pressure and increasing the temperature. In the case of carbon nanotubes (CNTs) with nanoscale diameters, it is possible to filtrate in the FMF regime under normal conditions. This paper reviews recent progress in theoretical and experimental studies of air filtration in the FMF regime. Typical structure models of high-efficiency particulate (HEPA) air filters based on CNTs are introduced. The pressure drop in air filters operated in the FMF regime is less than that predicted by the conventional air filtration theory. The thinnest HEPA filters fabricated from single-walled CNT films have an extremely low pressure drop. CNT air filters with a gradient nanostructure are shown to give a much better filtration performance in dynamic filtration. CNT air filters with a hierarchical structure and an agglomerated CNT fluidized bed air filter are also introduced. Finally, the challenges and opportunities for the application of CNTs in air filtration are discussed.
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Affiliation(s)
- Peng Li
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China; Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China; Jibei Electric Power Research Institute, State Grid Jibei Electric Power Company Limited, Beijing, 100045, China
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Mullins BJ, Mead-Hunter R, Pitta RN, Kasper G, Heikamp W. Comparative performance of philic and phobic oil-mist filters. AIChE J 2014. [DOI: 10.1002/aic.14479] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Benjamin J. Mullins
- School of Public Health, Faculty of Health Sciences, Curtin University; GPO Box U1987 Perth WA 6845 Australia
- Fluid Dynamics Research Group, Curtin University; GPO Box U1987 Perth WA 6845 Australia
| | - Ryan Mead-Hunter
- School of Public Health, Faculty of Health Sciences, Curtin University; GPO Box U1987 Perth WA 6845 Australia
- Fluid Dynamics Research Group, Curtin University; GPO Box U1987 Perth WA 6845 Australia
| | - Renato N. Pitta
- Institute for Mechanical Process Engineering and Mechanics (MVM), Karlsruhe Institute of Technology; D-76131 Karlsruhe Germany
| | - Gerhard Kasper
- Institute for Mechanical Process Engineering and Mechanics (MVM), Karlsruhe Institute of Technology; D-76131 Karlsruhe Germany
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Mead-Hunter R, Braddock RD, Kampa D, Merkel N, Kasper G, Mullins BJ. The relationship between pressure drop and liquid saturation in oil-mist filters – Predicting filter saturation using a capillary based model. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2012.11.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Contribution of synchrotron X-ray holotomography to the understanding of liquid distribution in a medium during liquid aerosol filtration. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2010.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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