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Type: Artigo de periódico
Title: Indirect measurement method for laminar to turbulent airflow through horticultural produce simulators
Author: Vigneault, C
de Castro, LR
Abstract: Sixty-four plastic balls were instrumented for use as horticultural produce simulators and strategically distributed in an orthogonal matrix along with 448 other plastic spheres to simulate precooling of column-stacked produce. This research tool was based on the correlation between the cooling rate of produce simulators and the air approach velocity. Since a range of airflow rates was already recognized as creating particular difficulties for indirect air velocity measurement, particular care was taken with the air velocity measurement of the theoretical range of each airflow pattern, namely, laminar transient, and turbulent. Correlations were determined by measuring the half-cooling time of each instrumented ball positioned at a fixed location inside a ball matrix that was inserted into an open-ended ventilation tunnel and subjected to various airflows. The results obtained allowed the laminar flow pattern to be distinguished from the transient and turbulent patterns using a specific correlation relating the half-cooling time to the air velocity for this type of airflow pattern. However, a single equation was used to cot-relate half-cooling time to air velocity for transient and turbulent airflow patterns. The new calibration decreased the experimental error and standard deviation obtained with the indirect measurement method system previously developed.
Subject: air approach velocity
forced-air cooling
half-cooling time
porous medium
produce simulator
transient airflow pattern
Country: EUA
Editor: Amer Soc Agricultural & Biological Engineers
Rights: aberto
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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