Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Date

2002

Journal or Book Title

Transactions of the ASAE

Volume

45

Issue

1

First Page

201

Last Page

214

Research Focus Area(s)

Animal Production Systems Engineering

Abstract

Experiments using two scale–models were conducted to study non–isothermal airflow similarity in a ceiling slot–ventilated agricultural enclosure. The main criteria used for determining similarity were airflow pattern similarity, occupied zone airspeed, and temperature similarity. For agricultural ventilation issues, these were projected to be paramount to a successful scale–model study. The current study, based on past agricultural ventilation studies, focused attention on the Archimedes number (Ar) and Momentum ratio (Rm) as the similitude criteria for non–isothermal airflow. Results indicated that Ar is the appropriate similitude criteria for non–isothermal airflow patterns under strong buoyancy–affected conditions where Ar > 0.015. With increasing airflow or decreasing temperature differences, resulting in a lower buoyancy–affected air–jet, Rm with a consistent overall temperature differential was determined to be the appropriate similitude criteria. This study focused on practical considerations for conducting scale mode studies such as scale–model conditions measured in the animal occupied zone and it’s relation to expected prototype behavior.

Comments

This article is from Transactions of the ASABE 45, no. 1 (2002): 201–214.

Copyright Owner

American Society of Agricultural Engineers

Language

en

Date Available

April 30, 2013

File Format

application/pdf

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