Air mixing criteria for ceiling slot-ventilated agricultural enclosures

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dc.contributor.advisor Steven J. Hoff
dc.contributor.author Yu, Hsin
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-08-23T00:24:31.000
dc.date.accessioned 2020-06-30T07:13:27Z
dc.date.available 2020-06-30T07:13:27Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 1996
dc.date.issued 1996
dc.description.abstract <p>The use of a scale-model is an effective technique to predict the performance of ventilation in full-scale prototypes. Many criteria have been proposed to simulate the behavior of airflow between scale-model and prototype. Because of the inconsistent results of past proposed similarity criteria, more validation work is needed to clarify the conflicts;Dimensional analysis using both the Buckingham Pi method and manipulating the governing differential equations was used to theoretically establish similarity parameters. Only partial similarity was reached since conflicts exist between proposed similarity parameters;Experiments of two scale models were conducted to study airflow similarity in ceiling slot-ventilated agricultural enclosures using different similarity criteria. The evaluation of similarity between scale-model and prototype included validation of penetration distance, airflow pattern, airspeed field, and temperature field using methods that included smoke visualization, airspeed field measurement, and temperature field measurement;The studies focused on the Reynolds number (Re) and inlet jet momentum ratio (Rm) as the similitude criteria for isothermal airflow, and Archimedes number (Ar) for nonisothermal airflow. The experimental results offer better agreement using Rm than using Re as the similitude criterion for isothermal airflow. Ar is an appropriate similitude criterion when the nonisothermal airflow pattern exhibits two-circulation airflow behavior. After the airflow is increased resulting in a single-circulation airflow, Rm associated with a similar heat load becomes the better similitude criteria;Future studies including improvement of the evaluation method, more complete investigation of the enclosure, variation of scale dimension and configuration layout, and better control of the experimental environment are recommended.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/11506/
dc.identifier.articleid 12505
dc.identifier.contextkey 6455394
dc.identifier.doi https://doi.org/10.31274/rtd-180813-10531
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/11506
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/64771
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/11506/r_9635372.pdf|||Fri Jan 14 18:52:03 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Agricultural and biosystems engineering
dc.subject.keywords Agricultural engineering
dc.title Air mixing criteria for ceiling slot-ventilated agricultural enclosures
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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