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Numerical Calculation of Sink Velocities for Helminth Eggs in Water

  • The settling velocities of helminth eggs of three types, namely Ascaris suum (ASC), Trichuris suis (TRI), and Oesophagostomum spp. (OES), in clean tap water are computationally determined by means of computational fluid dynamics, using the general-purpose CFD software ANSYS Fluent 18.0. The previous measurements of other authors are taken as the basis for the problem formulation and validation, whereby the latter is performed by comparing the predicted sink velocities with those measured in an Owen tube. To enable a computational treatment, the measured shapes of the eggs are parametrized by idealizing them in terms of elementary geometric forms. As the egg shapes show a variation within each class, “mean” shapes are considered. The sink velocities are obtained through the computationally obtained drag coefficients. The latter are defined by means of steady-state calculations. Predicted sink velocities are compared with the measured ones. It is observed that the calculated values showThe settling velocities of helminth eggs of three types, namely Ascaris suum (ASC), Trichuris suis (TRI), and Oesophagostomum spp. (OES), in clean tap water are computationally determined by means of computational fluid dynamics, using the general-purpose CFD software ANSYS Fluent 18.0. The previous measurements of other authors are taken as the basis for the problem formulation and validation, whereby the latter is performed by comparing the predicted sink velocities with those measured in an Owen tube. To enable a computational treatment, the measured shapes of the eggs are parametrized by idealizing them in terms of elementary geometric forms. As the egg shapes show a variation within each class, “mean” shapes are considered. The sink velocities are obtained through the computationally obtained drag coefficients. The latter are defined by means of steady-state calculations. Predicted sink velocities are compared with the measured ones. It is observed that the calculated values show a better agreement with the measurements, for ASC and TRI, compared to the theoretical sink values delivered by the Stokes theory. However, the observed agreement is still found not to be very satisfactory, indicating the role of further parameters, such as the uncertainties in the characterization of egg shapes or flocculation effects even in clean tap water.zeige mehrzeige weniger

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Metadaten
Verfasserangaben:Ali Cemal BenimORCiD
Open Access (DINI-Set):open_access
Qualitätssicherung:peer reviewed
Open Access :Gold - Erstveröffentlichung mit Lizenzhinweis
Fachbereich/Einrichtung:Hochschule Düsseldorf / Fachbereich - Maschinenbau und Verfahrenstechnik
Dokumentart:Wissenschaftlicher Artikel
Erscheinungsjahr:2021
Sprache der Veröffentlichung:Englisch
Verlag:MDPI
Titel des übergeordneten Werkes (Englisch):Computation
Band/Jahrgang/Volume:9
Heft/Ausgabe/Issue:12
Aufsatznummer:136
URN:urn:nbn:de:hbz:due62-opus-37318
DOI:https://doi.org/10.3390/computation9120136
ISSN:2079-3197
Freies Schlagwort / Tag:Applied Mathematics; DOAJ
General Computer Science; Modeling and Simulation; Theoretical Computer Science
Fördernde Institution:Deutsche Bundesstiftung Umwelt
Fördernummer:34847/01-23
Corresponding Author:Ali Cemal Benim
DDC-Klassifikation:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Lizenz (Deutsch):Creative Commons - CC BY - Namensnennung 4.0 International
Datum der Freischaltung:18.05.2022
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