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Pressure drop across insect-proof screens
Year:
1998
Authors :
Shklyar, Alexander
;
.
Teitel, Meir
;
.
Volume :
41
Co-Authors:
Teitel, M., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Shklyar, A., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Facilitators :
From page:
1829
To page:
1834
(
Total pages:
6
)
Abstract:
Screens can exclude insects from greenhouses and reduce the need for pesticides. They can also be used to create a barrier against the outside environment, to facilitate biological control within the greenhouse. However, the screens have a major drawback in that they reduce the rate of ventilation because of their resistance to airflow. As air flows through the screen a static pressure drop occurs across it. This pressure loss is usually specified in the literature by a pressure-loss coefficient, K, which is a function of the porosity of the screen and of the Reynolds number. Numerical simulations show that the pressure loss coefficient of a woven screen may also be dependent on the texture of the weave when the spacing between two adjacent threads of the screen is small in comparison with the thread diameter. The simulations show that the velocity field immediately downstream from the screen is strongly dependent on the weave texture. Under certain conditions, a backflow could develop immediately downstream from the screen, which might hinder insect penetration.Screens can exclude insects from greenhouses and reduce the need for pesticides. They can also be used to create a barrier against the outside environment, to facilitate biological control within the greenhouse. However, the screens have a major drawback in that they reduce the rate of ventilation because of their resistance to airflow. As air flows through the screen a static pressure drop occurs across it. This pressure loss is usually specified in the literature by a pressure-loss coefficient, K, which is a function of the porosity of the screen and of the Reynolds number. Numerical simulations show that the pressure loss coefficient of a woven screen may also be dependent on the texture of the weave when the spacing between two adjacent threads of the screen is small in comparison with the thread diameter. The simulations show that the velocity field immediately downstream from the screen is strongly dependent on the weave texture. Under certain conditions, a backflow could develop immediately downstream from the screen, which might hinder insect penetration.
Note:
Related Files :
computer simulation
greenhouse
greenhouses
Insecta
Insect control
Pressure loss coefficient
Screen
Ventilation
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29831
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:49
Scientific Publication
Pressure drop across insect-proof screens
41
Teitel, M., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Shklyar, A., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Pressure drop across insect-proof screens
Screens can exclude insects from greenhouses and reduce the need for pesticides. They can also be used to create a barrier against the outside environment, to facilitate biological control within the greenhouse. However, the screens have a major drawback in that they reduce the rate of ventilation because of their resistance to airflow. As air flows through the screen a static pressure drop occurs across it. This pressure loss is usually specified in the literature by a pressure-loss coefficient, K, which is a function of the porosity of the screen and of the Reynolds number. Numerical simulations show that the pressure loss coefficient of a woven screen may also be dependent on the texture of the weave when the spacing between two adjacent threads of the screen is small in comparison with the thread diameter. The simulations show that the velocity field immediately downstream from the screen is strongly dependent on the weave texture. Under certain conditions, a backflow could develop immediately downstream from the screen, which might hinder insect penetration.Screens can exclude insects from greenhouses and reduce the need for pesticides. They can also be used to create a barrier against the outside environment, to facilitate biological control within the greenhouse. However, the screens have a major drawback in that they reduce the rate of ventilation because of their resistance to airflow. As air flows through the screen a static pressure drop occurs across it. This pressure loss is usually specified in the literature by a pressure-loss coefficient, K, which is a function of the porosity of the screen and of the Reynolds number. Numerical simulations show that the pressure loss coefficient of a woven screen may also be dependent on the texture of the weave when the spacing between two adjacent threads of the screen is small in comparison with the thread diameter. The simulations show that the velocity field immediately downstream from the screen is strongly dependent on the weave texture. Under certain conditions, a backflow could develop immediately downstream from the screen, which might hinder insect penetration.
Scientific Publication
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