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COMPUTATIONAL ANALYSIS OF LOAD VENTILATION IN BROILER TRANSPORT REA
Pinheiro,Daniel G.; Machado,Nítalo A. F.; Barbosa Filho,José A. D.; Silva,Iran J. O. Da.
ABSTRACT The characterization of ventilation during the transport of broiler chickens is essential for identifying and characterizing the potential problems of a convective heat flow and its effects on the welfare and the health and production conditions of the chickens. The objective of this study was to evaluate the ventilation patterns in two layout models of a live transport load: conventional (LC) and alternative (LA) with spacers placed between the chicken transport crates. Computational fluid dynamics (CFD) simulations and wind tunnel tests were performed using small scale models. The results showed that the use of spacers between crates (LA model) modified the ventilation patterns and increased the wind circulation between crates. However, wind...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Poultry; Animal welfare; CFD simulation; Precision livestock farming.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100009
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Thermal and ammonia concentration gradients in a rabbit barn with two ventilation system designs AGRIAMBI
Flores-Velázquez,Jorge; Villarreal-Guerrero,Federico; Ojeda,Waldo; Ruíz-García,Agustín.
ABSTRACT Rabbit barns are of economic importance in central Mexico, where rabbit breeders use rustic buildings for production. In such barns, climate conditioning is mostly based on natural ventilation (NV) where the lack of a well-designed NV system may be a limiting factor. In this study, computational fluid dynamics was used to analyse the performance of the NV system in a 24 x 4 x 4.8 m typical Central Mexico rabbit barn with a density of 20 rabbits m-2 of cage. The barn included both side vents at 1.2 m in height from the ground. Results indicated exchange rates of 0.052 and 2.9 x 10-4 m3 m-2 s-1 when the wind direction was simulated as orthogonal and parallel to the side vents, respectively, suggesting the orthogonal direction favoured the exchange...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Turbbulence model; Pressure; Convective effect; CFD simulation; Animal confort.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000200134
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噴霧屏蔽行進中性能之模擬 Taiwan Agricultural Research Institute
蔡致榮; H. Erdal Ozkan; Jyh-Rong Tsay;H. Erdal Ozkan.
[[abstract]]有關屏蔽噴霧之風洞試驗大都於靜止情況下進行,而田間試驗則著重於飄移數量之調查,因此,並無行進中噴霧屏蔽性能之資料可資參考,更別提噴霧屏蔽之行進速度與行進方向對降低噴霧飄移之影響,本研究中使用電腦流體動力模擬軟體FLUENT,模擬雙弧形薄板屏蔽以研究行進屏蔽於不同行進速度與行進方向對降低飄移之影響。同時,更進一步比較三維度氣流中機械式屏蔽與氣流式屏蔽之行進屏蔽效果。本研究所得之主要結論如后,風速與噴霧機行進速度間區域相對速度在控制行進中噴霧機之噴霧飄移上扮演重要角色,區域相對速度愈大,飄移潛勢愈大。傳統噴霧當噴霧機逆風作業時飄移潛勢隨行進速度之增加而略微增加,但當噴霧機順風作業時只要噴霧機行進速度小於風速,飄移潛勢係隨行進速度之增加反而降低。雙弧形薄板屏蔽對於降低飄移之表現,不管是逆風或順風作業都比無屏蔽噴霧來得佳,而逆風作業顯然比順風作業有較低之飄移潛勢。行進速度1.34 m/s下比較三維度氣流中屏蔽性能之模擬結果顯示雙弧薄板屏蔽分別於逆風與順風作業時,提供相較於傳統逆風向下噴霧達60.6%與29.3%之減低飄移效果,而具最佳操作設定之氣流屏蔽不管是逆風或順風作業都提供減低飄移之完全控制。
Palavras-chave: 噴霧屏蔽 行進 CFD模擬 FLUENT Moving shield; CFD simulation; FLUENT [[classification]]8.
Ano: 1997
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