
Agricultural and Biosystems Engineering Publications
Document Type
Article
Publication Date
1995
Journal or Book Title
Transactions of the ASAE
Volume
38
Issue
6
First Page
1853
Last Page
1862
Abstract
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.
Access
Open
Copyright Owner
American Society of Agricultural Engineers
Copyright Date
1995
Language
en
File Format
application/pdf
Recommended Citation
Hoff, Steven J., "A Simplified Turbulence Model for Describing Airflow in Ceiling Slot-ventilated Enclosures" (1995). Agricultural and Biosystems Engineering Publications. 364.
https://lib.dr.iastate.edu/abe_eng_pubs/364
Comments
This article is from Transactions of the ASAE 38, no. 6 (1005): 1853–1862.