Convection regime between canopy and air in a greenhouse
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 dimensio...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universidade de São Paulo
2006-02-01
|
| Series: | Scientia Agricola |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012&tlng=en |
| _version_ | 1798014504624193536 |
|---|---|
| author | Roberto Terumi Atarassi Marcos Vinicius Folegatti René Porfírio Camponez do Brasil |
| author_facet | Roberto Terumi Atarassi Marcos Vinicius Folegatti René Porfírio Camponez do Brasil |
| author_sort | Roberto Terumi Atarassi |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T15:19:34Z |
| format | Article |
| id | doaj.art-985827a2e0d34a81901132747b231af7 |
| institution | Directory Open Access Journal |
| issn | 1678-992X |
| language | English |
| last_indexed | 2024-04-11T15:19:34Z |
| publishDate | 2006-02-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Scientia Agricola |
| spelling | doaj.art-985827a2e0d34a81901132747b231af72022-12-22T04:16:25ZengUniversidade de São PauloScientia Agricola1678-992X2006-02-016317781Convection regime between canopy and air in a greenhouseRoberto Terumi Atarassi0Marcos Vinicius Folegatti1René Porfírio Camponez do Brasil2USPUSPUSPThe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012&tlng=enheat fluxleafaerodynamic resistance |
| spellingShingle | Roberto Terumi Atarassi Marcos Vinicius Folegatti René Porfírio Camponez do Brasil Convection regime between canopy and air in a greenhouse Scientia Agricola heat flux leaf aerodynamic resistance |
| title | Convection regime between canopy and air in a greenhouse |
| title_full | Convection regime between canopy and air in a greenhouse |
| title_fullStr | Convection regime between canopy and air in a greenhouse |
| title_full_unstemmed | Convection regime between canopy and air in a greenhouse |
| title_short | Convection regime between canopy and air in a greenhouse |
| title_sort | convection regime between canopy and air in a greenhouse |
| topic | heat flux leaf aerodynamic resistance |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012&tlng=en |
| work_keys_str_mv | AT robertoterumiatarassi convectionregimebetweencanopyandairinagreenhouse AT marcosviniciusfolegatti convectionregimebetweencanopyandairinagreenhouse AT reneporfiriocamponezdobrasil convectionregimebetweencanopyandairinagreenhouse |