A Simplified Turbulence Model for Describing Airflow in Ceiling Slot-ventilated Enclosures

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dc.contributor.author Hoff, Steven
dc.contributor.author Hoff, Steven
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T10:10:41.000
dc.date.accessioned 2020-06-29T22:39:13Z
dc.date.available 2020-06-29T22:39:13Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 1995
dc.date.embargo 2013-04-30
dc.date.issued 1995
dc.description.abstract <p>A numerical model was developed to predict flow occurring with opposing plane-wall ceiling jets representative of slot-ventilated livestock facilities. This model, termed the BETA model, was evaluated by comparing predicted axial and animal occupied zone (AOZ) velocity distributions with a low Reynold’s Number turbulence model (LBLR) and a laminar model (LAM). In addition, the BETA model results were compared with experimental results from a laboratory-scale test chamber. For opposing plane-wall ceiling jets, the predominant gradient in turbulent viscosity was predicted to occur in the vertical direction. An effective viscosity was defined as a function of the inlet Reynold’s Number (ReH) and normalized vertical height from the floor. The effective viscosity was used to selectively augment the laminar viscosity in the Navier-Stoke’s equation. Predicted comparisons between BETA and the LBLR models showed negligible differences for ventilating conditions between ReH of 35,032 and 11,752. Comparison with experimentally measured axial velocity decay indicated that the BETA model reproduced ceiling jet development as well as the LBLR model.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASAE </em>38, no. 6 (1005): <a href="http://elibrary.asabe.org/abstract.asp?aid=28014&t=3&dabs=Y&redir=&redirType=" target="_blank">1853–1862</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/364/
dc.identifier.articleid 1621
dc.identifier.contextkey 4088705
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/364
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1122
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/364/1995_HoffSJ_SimplifiedTurbulenceModel.pdf|||Fri Jan 14 23:47:54 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Model
dc.subject.keywords Ventilation
dc.subject.keywords Turbulence
dc.title A Simplified Turbulence Model for Describing Airflow in Ceiling Slot-ventilated Enclosures
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 98b46d48-66a2-4458-9b42-8c4aa050664d
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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