Study of Oil Particle Concentration Vertical Distribution of Various Sizes under Displacement Ventilation System in Large-Space Machining Workshop
The widespread use of metal working fluids (MWFs) in machining processes leads to the production of a large number of harmful oil particles, which may pose serious health hazards to workers. The oil particle concentration has an inhomogeneous distribution in large spaces under displacement ventilati...
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| Veröffentlicht in: | International journal of environmental research and public health 2022-06, Vol.19 (11), p.6932 |
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| creator | Wang, Fei Meng, Qinpeng Lin, Chengjie Wang, Xin Weng, Wenbing |
| description | The widespread use of metal working fluids (MWFs) in machining processes leads to the production of a large number of harmful oil particles, which may pose serious health hazards to workers. The oil particle concentration has an inhomogeneous distribution in large spaces under displacement ventilation (DV) system, and the supply air volume required to maintain a low particle concentration under a DV system may be less than that needed under a mixing ventilation system. In this study, computational fluid dynamics (CFD) was used to study the particle concentration distribution rules and characteristics under various particle sizes in a large-space machine workshop with a DV system. Several distribution indices, such as the inhomogeneity factor and stratification height were utilized to analyze the inhomogeneous distribution of particle concentration; furthermore, sensitivity analyses were conducted for these indices. We found that the particle concentration shows a similar inhomogeneity factor distribution rule along the vertical direction under an air change rate of 2−6 in the DV system. The workspace inhomogeneity factor of particles smaller than 5 μm is less than 0.25, whereas that of 10-μm particles declines with an increase in air supply volume. Approximately double the supply air volume is required to keep the 10-μm particle concentration at the same level as particles smaller than 5 μm. The workspace inhomogeneity factor of small particles (5 μm) is more sensitive to the supply air volume than other parameters. The results of this study can be applied for the design and control of displacement ventilation systems in large-space machining workshops. |
| doi_str_mv | 10.3390/ijerph19116932 |
| format | Article |
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The oil particle concentration has an inhomogeneous distribution in large spaces under displacement ventilation (DV) system, and the supply air volume required to maintain a low particle concentration under a DV system may be less than that needed under a mixing ventilation system. In this study, computational fluid dynamics (CFD) was used to study the particle concentration distribution rules and characteristics under various particle sizes in a large-space machine workshop with a DV system. Several distribution indices, such as the inhomogeneity factor and stratification height were utilized to analyze the inhomogeneous distribution of particle concentration; furthermore, sensitivity analyses were conducted for these indices. We found that the particle concentration shows a similar inhomogeneity factor distribution rule along the vertical direction under an air change rate of 2−6 in the DV system. The workspace inhomogeneity factor of particles smaller than 5 μm is less than 0.25, whereas that of 10-μm particles declines with an increase in air supply volume. Approximately double the supply air volume is required to keep the 10-μm particle concentration at the same level as particles smaller than 5 μm. The workspace inhomogeneity factor of small particles (<5 μm) is more sensitive to the machine height and machine surface temperature than other parameters, whereas that of large particles (>5 μm) is more sensitive to the supply air volume than other parameters. The results of this study can be applied for the design and control of displacement ventilation systems in large-space machining workshops.</description><identifier>ISSN: 1660-4601</identifier><identifier>ISSN: 1661-7827</identifier><identifier>EISSN: 1660-4601</identifier><identifier>DOI: 10.3390/ijerph19116932</identifier><identifier>PMID: 35682520</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Air Pollution, Indoor - analysis ; Air supplies ; Computational fluid dynamics ; Computer applications ; Displacement ; Efficiency ; Factories ; Fluid dynamics ; Health hazards ; Humans ; Hydrodynamics ; Inhomogeneity ; Machining ; Metalworking fluids ; Oil ; Parameter sensitivity ; Particle Size ; Reynolds number ; Sensitivity analysis ; Simulation ; Surface temperature ; Turbulence models ; Velocity ; Ventilation ; Ventilation - methods ; Vertical distribution ; Viscosity ; Workshops</subject><ispartof>International journal of environmental research and public health, 2022-06, Vol.19 (11), p.6932</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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The oil particle concentration has an inhomogeneous distribution in large spaces under displacement ventilation (DV) system, and the supply air volume required to maintain a low particle concentration under a DV system may be less than that needed under a mixing ventilation system. In this study, computational fluid dynamics (CFD) was used to study the particle concentration distribution rules and characteristics under various particle sizes in a large-space machine workshop with a DV system. Several distribution indices, such as the inhomogeneity factor and stratification height were utilized to analyze the inhomogeneous distribution of particle concentration; furthermore, sensitivity analyses were conducted for these indices. We found that the particle concentration shows a similar inhomogeneity factor distribution rule along the vertical direction under an air change rate of 2−6 in the DV system. The workspace inhomogeneity factor of particles smaller than 5 μm is less than 0.25, whereas that of 10-μm particles declines with an increase in air supply volume. Approximately double the supply air volume is required to keep the 10-μm particle concentration at the same level as particles smaller than 5 μm. The workspace inhomogeneity factor of small particles (<5 μm) is more sensitive to the machine height and machine surface temperature than other parameters, whereas that of large particles (>5 μm) is more sensitive to the supply air volume than other parameters. The results of this study can be applied for the design and control of displacement ventilation systems in large-space machining workshops.</description><subject>Air Pollution, Indoor - analysis</subject><subject>Air supplies</subject><subject>Computational fluid dynamics</subject><subject>Computer applications</subject><subject>Displacement</subject><subject>Efficiency</subject><subject>Factories</subject><subject>Fluid dynamics</subject><subject>Health hazards</subject><subject>Humans</subject><subject>Hydrodynamics</subject><subject>Inhomogeneity</subject><subject>Machining</subject><subject>Metalworking fluids</subject><subject>Oil</subject><subject>Parameter sensitivity</subject><subject>Particle Size</subject><subject>Reynolds number</subject><subject>Sensitivity analysis</subject><subject>Simulation</subject><subject>Surface temperature</subject><subject>Turbulence models</subject><subject>Velocity</subject><subject>Ventilation</subject><subject>Ventilation - methods</subject><subject>Vertical distribution</subject><subject>Viscosity</subject><subject>Workshops</subject><issn>1660-4601</issn><issn>1661-7827</issn><issn>1660-4601</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><recordid>eNpVUclOwzAQtRCI_coRWeIc8BYnviChskpFRSrL0XKTaeuS2sFOkMpn8MWkFBA9zWjmLTN6CB1Rcsq5Imd2BqGeUkWpVJxtoF0qJUmEJHTzX7-D9mKcEcJzIdU22uGpzFnKyC76HDZtucB-jAe2wg8mNLaoAPe8K8A1wTTWO_wMy7Gp8KWNTbCj9nvacZ5NsL6NeGg_IOLWlRCWmLoyBcw7fsd0ja1WKsNFbGCOrcN9EyaQDOsOhe9NMbXOugl-8eE1Tn19gLbGpopw-FP30dP11WPvNukPbu56F_2k4JyzhOeKiNIQKIAKxgSVWU5SM4ISOORjw1WuuJQ0EyJTQmUpo5SBApaTgpqU8X10vtKt29EcytW_la6DnZuw0N5Yvb5xdqon_l0rmhNFaCdw8iMQ_FsLsdEz3wbX3ayZzARPBeFLm9MVqgg-xgDjPwdK9DJDvZ5hRzj-f9cf_Dc0_gUUops8</recordid><startdate>20220606</startdate><enddate>20220606</enddate><creator>Wang, Fei</creator><creator>Meng, Qinpeng</creator><creator>Lin, Chengjie</creator><creator>Wang, Xin</creator><creator>Weng, Wenbing</creator><general>MDPI AG</general><general>MDPI</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8C1</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>K9.</scope><scope>M0S</scope><scope>M1P</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0002-3541-548X</orcidid></search><sort><creationdate>20220606</creationdate><title>Study of Oil Particle Concentration Vertical Distribution of Various Sizes under Displacement Ventilation System in Large-Space Machining Workshop</title><author>Wang, Fei ; Meng, Qinpeng ; Lin, Chengjie ; Wang, Xin ; Weng, Wenbing</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3332-38904da0ece14224167805abede3e8fa398936617447949752112e9e280c1a523</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Air Pollution, Indoor - analysis</topic><topic>Air supplies</topic><topic>Computational fluid dynamics</topic><topic>Computer applications</topic><topic>Displacement</topic><topic>Efficiency</topic><topic>Factories</topic><topic>Fluid dynamics</topic><topic>Health hazards</topic><topic>Humans</topic><topic>Hydrodynamics</topic><topic>Inhomogeneity</topic><topic>Machining</topic><topic>Metalworking fluids</topic><topic>Oil</topic><topic>Parameter sensitivity</topic><topic>Particle Size</topic><topic>Reynolds number</topic><topic>Sensitivity analysis</topic><topic>Simulation</topic><topic>Surface temperature</topic><topic>Turbulence models</topic><topic>Velocity</topic><topic>Ventilation</topic><topic>Ventilation - methods</topic><topic>Vertical distribution</topic><topic>Viscosity</topic><topic>Workshops</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Fei</creatorcontrib><creatorcontrib>Meng, Qinpeng</creatorcontrib><creatorcontrib>Lin, Chengjie</creatorcontrib><creatorcontrib>Wang, Xin</creatorcontrib><creatorcontrib>Weng, Wenbing</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>Public Health Database</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>International journal of environmental research and public health</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Fei</au><au>Meng, Qinpeng</au><au>Lin, Chengjie</au><au>Wang, Xin</au><au>Weng, Wenbing</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Study of Oil Particle Concentration Vertical Distribution of Various Sizes under Displacement Ventilation System in Large-Space Machining Workshop</atitle><jtitle>International journal of environmental research and public health</jtitle><addtitle>Int J Environ Res Public Health</addtitle><date>2022-06-06</date><risdate>2022</risdate><volume>19</volume><issue>11</issue><spage>6932</spage><pages>6932-</pages><issn>1660-4601</issn><issn>1661-7827</issn><eissn>1660-4601</eissn><abstract>The widespread use of metal working fluids (MWFs) in machining processes leads to the production of a large number of harmful oil particles, which may pose serious health hazards to workers. The oil particle concentration has an inhomogeneous distribution in large spaces under displacement ventilation (DV) system, and the supply air volume required to maintain a low particle concentration under a DV system may be less than that needed under a mixing ventilation system. In this study, computational fluid dynamics (CFD) was used to study the particle concentration distribution rules and characteristics under various particle sizes in a large-space machine workshop with a DV system. Several distribution indices, such as the inhomogeneity factor and stratification height were utilized to analyze the inhomogeneous distribution of particle concentration; furthermore, sensitivity analyses were conducted for these indices. We found that the particle concentration shows a similar inhomogeneity factor distribution rule along the vertical direction under an air change rate of 2−6 in the DV system. The workspace inhomogeneity factor of particles smaller than 5 μm is less than 0.25, whereas that of 10-μm particles declines with an increase in air supply volume. Approximately double the supply air volume is required to keep the 10-μm particle concentration at the same level as particles smaller than 5 μm. The workspace inhomogeneity factor of small particles (<5 μm) is more sensitive to the machine height and machine surface temperature than other parameters, whereas that of large particles (>5 μm) is more sensitive to the supply air volume than other parameters. The results of this study can be applied for the design and control of displacement ventilation systems in large-space machining workshops.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>35682520</pmid><doi>10.3390/ijerph19116932</doi><orcidid>https://orcid.org/0000-0002-3541-548X</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Air Pollution, Indoor - analysis Air supplies Computational fluid dynamics Computer applications Displacement Efficiency Factories Fluid dynamics Health hazards Humans Hydrodynamics Inhomogeneity Machining Metalworking fluids Oil Parameter sensitivity Particle Size Reynolds number Sensitivity analysis Simulation Surface temperature Turbulence models Velocity Ventilation Ventilation - methods Vertical distribution Viscosity Workshops |
| title | Study of Oil Particle Concentration Vertical Distribution of Various Sizes under Displacement Ventilation System in Large-Space Machining Workshop |
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