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Provedor de dados:  Scientia Agricola
País:  Brazil
Título:  Convection regime between canopy and air in a greenhouse
Autores:  Atarassi,Roberto Terumi
Folegatti,Marcos Vinicius
Brasil,René Porfírio Camponez do
Data:  2006-02-01
Ano:  2006
Palavras-chave:  Heat flux
Leaf
Aerodynamic resistance
Resumo:  The use of covering materials in protected environments modifies the air movement close to the crop canopy compared to external environment, which changes the heat and mass transfer between canopy and air. Several researches have been made in greenhouses to estimate mass and heat flux using dimensionless numbers to characterize the type of convection (forced, free or mixed). The knowledge of which one is dominant allows simplifications and specific approaches. The dominant convection regime between canopy and air was determined in a naturally ventilated greenhouse cropped with sweet pepper. Forced convection was predominant, representing more than 70% of the time. During daytime, an increase of mixed convection was observed. It is thus appropriated the use of models that include both forced and mixed convection in the studies of mass and heat exchanges in canopy - air interface.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012
Editor:  São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação:  10.1590/S0103-90162006000100012
Formato:  text/html
Fonte:  Scientia Agricola v.63 n.1 2006
Direitos:  info:eu-repo/semantics/openAccess
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