Air mixing criteria for ceiling slot-ventilated agricultural enclosures

Thumbnail Image
Date
1996
Authors
Yu, Hsin
Major Professor
Advisor
Steven J. Hoff
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Organizational Unit
Agricultural and Biosystems Engineering

Since 1905, the Department of Agricultural Engineering, now the Department of Agricultural and Biosystems Engineering (ABE), has been a leader in providing engineering solutions to agricultural problems in the United States and the world. The department’s original mission was to mechanize agriculture. That mission has evolved to encompass a global view of the entire food production system–the wise management of natural resources in the production, processing, storage, handling, and use of food fiber and other biological products.

History
In 1905 Agricultural Engineering was recognized as a subdivision of the Department of Agronomy, and in 1907 it was recognized as a unique department. It was renamed the Department of Agricultural and Biosystems Engineering in 1990. The department merged with the Department of Industrial Education and Technology in 2004.

Dates of Existence
1905–present

Historical Names

  • Department of Agricultural Engineering (1907–1990)

Related Units

Journal Issue
Is Version Of
Versions
Series
Abstract

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.

Comments
Description
Keywords
Citation
Source
Copyright
Mon Jan 01 00:00:00 UTC 1996