Aggregation of microplastic and biogenic particles in upper-ocean turbulence

The aggregation of microplastic and biogenic particles in upper-ocean turbulence is studied by means of direct numerical simulations and Lagrangian tracking of point particles. The range of particle properties (size and density) and mixture characteristics (turbulence intensity and particle number d...

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Detalles Bibliográficos
Autores: Rahmani, Mona, Gupta, Akanksha, Jofre Cruanyes, Lluís|||0000-0003-2437-259X
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/374713
Acceso en línea:https://hdl.handle.net/2117/374713
https://dx.doi.org/10.1016/j.ijmultiphaseflow.2022.104253
Access Level:acceso abierto
Palabra clave:Turbulence
Microplastics
Aggregation
Ocean turbulence
Particle-laden flow
Turbulència
Microplàstics
Àrees temàtiques de la UPC::Física::Física de fluids
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spelling Aggregation of microplastic and biogenic particles in upper-ocean turbulenceRahmani, MonaGupta, AkankshaJofre Cruanyes, Lluís|||0000-0003-2437-259XTurbulenceMicroplasticsAggregationMicroplasticsOcean turbulenceParticle-laden flowTurbulènciaMicroplàsticsÀrees temàtiques de la UPC::Física::Física de fluidsThe aggregation of microplastic and biogenic particles in upper-ocean turbulence is studied by means of direct numerical simulations and Lagrangian tracking of point particles. The range of particle properties (size and density) and mixture characteristics (turbulence intensity and particle number densities) analyzed correspond to scenarios reminiscent of the problematic of microplastics in marine systems. A density ratio of 1.5 between the biogenic and microplastic particles, and varying diameter size and number density ratios are assumed. In particular, the focus is placed on the flow and mixture conditions encountered in the surface boundary layer (top region) of oceans, in which microplastics and biogenic particles have been experimentally observed to interact under significantly complex behaviors. The analysis consists of three principal parts involving the spatio-temporal distribution of the disperse and continuous phases, the mechanisms and rates of particle collisions, and the composition of the resulting aggregates. The main findings, for the range of parameters considered in this work and under the simplifying assumptions made in the model, are that (i) microplastics can be found in a large fraction of aggregates in scenarios with different average diameter of the mixture and number density ratios between microplastic and biogenic particles, (ii) microplastic-containing aggregates will sink to the deeper ocean layers particularly in situations where the biogenic particles are larger and/or of similar size than microplastics, and (iii) the Stokes numbers of aggregates tend not to be significantly different from the Stokes numbers of the initial individual microplastic and biogenic particles. In addition, by examining the collision mechanisms, a model for the collision rate that reproduces the computational results is proposed.Peer Reviewed20222022-12-0120222022-10-20journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfapplication/pdfapplication/pdfhttps://hdl.handle.net/2117/374713https://dx.doi.org/10.1016/j.ijmultiphaseflow.2022.104253reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3747132026-05-27T15:37:01Z
dc.title.none.fl_str_mv Aggregation of microplastic and biogenic particles in upper-ocean turbulence
title Aggregation of microplastic and biogenic particles in upper-ocean turbulence
spellingShingle Aggregation of microplastic and biogenic particles in upper-ocean turbulence
Rahmani, Mona
Turbulence
Microplastics
Aggregation
Microplastics
Ocean turbulence
Particle-laden flow
Turbulència
Microplàstics
Àrees temàtiques de la UPC::Física::Física de fluids
title_short Aggregation of microplastic and biogenic particles in upper-ocean turbulence
title_full Aggregation of microplastic and biogenic particles in upper-ocean turbulence
title_fullStr Aggregation of microplastic and biogenic particles in upper-ocean turbulence
title_full_unstemmed Aggregation of microplastic and biogenic particles in upper-ocean turbulence
title_sort Aggregation of microplastic and biogenic particles in upper-ocean turbulence
dc.creator.none.fl_str_mv Rahmani, Mona
Gupta, Akanksha
Jofre Cruanyes, Lluís|||0000-0003-2437-259X
author Rahmani, Mona
author_facet Rahmani, Mona
Gupta, Akanksha
Jofre Cruanyes, Lluís|||0000-0003-2437-259X
author_role author
author2 Gupta, Akanksha
Jofre Cruanyes, Lluís|||0000-0003-2437-259X
author2_role author
author
dc.subject.none.fl_str_mv Turbulence
Microplastics
Aggregation
Microplastics
Ocean turbulence
Particle-laden flow
Turbulència
Microplàstics
Àrees temàtiques de la UPC::Física::Física de fluids
topic Turbulence
Microplastics
Aggregation
Microplastics
Ocean turbulence
Particle-laden flow
Turbulència
Microplàstics
Àrees temàtiques de la UPC::Física::Física de fluids
description The aggregation of microplastic and biogenic particles in upper-ocean turbulence is studied by means of direct numerical simulations and Lagrangian tracking of point particles. The range of particle properties (size and density) and mixture characteristics (turbulence intensity and particle number densities) analyzed correspond to scenarios reminiscent of the problematic of microplastics in marine systems. A density ratio of 1.5 between the biogenic and microplastic particles, and varying diameter size and number density ratios are assumed. In particular, the focus is placed on the flow and mixture conditions encountered in the surface boundary layer (top region) of oceans, in which microplastics and biogenic particles have been experimentally observed to interact under significantly complex behaviors. The analysis consists of three principal parts involving the spatio-temporal distribution of the disperse and continuous phases, the mechanisms and rates of particle collisions, and the composition of the resulting aggregates. The main findings, for the range of parameters considered in this work and under the simplifying assumptions made in the model, are that (i) microplastics can be found in a large fraction of aggregates in scenarios with different average diameter of the mixture and number density ratios between microplastic and biogenic particles, (ii) microplastic-containing aggregates will sink to the deeper ocean layers particularly in situations where the biogenic particles are larger and/or of similar size than microplastics, and (iii) the Stokes numbers of aggregates tend not to be significantly different from the Stokes numbers of the initial individual microplastic and biogenic particles. In addition, by examining the collision mechanisms, a model for the collision rate that reproduces the computational results is proposed.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-12-01
2022
2022-10-20
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/374713
https://dx.doi.org/10.1016/j.ijmultiphaseflow.2022.104253
url https://hdl.handle.net/2117/374713
https://dx.doi.org/10.1016/j.ijmultiphaseflow.2022.104253
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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