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| Manzano,Juan; Palau,Carmen Virginia; Azevedo,Benito Moreira de; Bomfim,Guilherme Vieira do; Vasconcelos,Denise Vieira. |
| ABSTRACT Venturi-type chemigation injectors are widely used due to their advantages: they do not require electric power and are cheap to operate. However, they also generate considerable energy losses which affect the pressure in the system. The correct characterization of these systems requires pressures to be correctly set at the inlet, injector and outlet points in relation to main and injected solution flows. These analytical relationships, as described in the International Organization for Standardization’s standard ISO 15873:2002, can be obtained theoretically, although it is recommended that the manufacturer should determine the real behavior of the injector by operational tests. These relationships should also be provided graphically in the form of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemigation; Fertigation; Head losses; Nomography. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200201 |
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| Manzano,Juan; Palau,Carmen Virginia; Azevedo,Benito Moreira de; Bomfim,Guilherme Vieira do; Vasconcelos,Denise Vieira. |
| En la UniversitatPolitécnica de València, Valencia, Espana (39°29' N; 0°23' W; 20 m), ha sido estudiado el funcionamiento de cuatro prototipos de inyector Venturi y tres formas de instalación distintas. El funcionamiento se ha analizado bajo diversos parâmetros, como pérdidas de carga, relación de caudales y rendimiento. Las formas de instalación analizadas han sido: sin inyección y con inyección y presiones negativas o positivas en la garganta. Las presiones se establecieron entre 10 y 40 m.c.a. A partir de los datos experimentales han sido procesados utilizando técnicas de regresión múltiple y análisis de la varianza. Con ellas, fue posible, a través de la integración de geometrías en función de los diâmetros, caudales y presiones, obtener expresiones... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Riego presurizado; Quimigación; Fertirigación. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200287 |
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| Palau,Carmen Virginia; Arviza,Jaime; Balbastre,Iban; Manzano,Juan. |
| ABSTRACT: DIMSUB is a computer program to complement a decision support tool (DST) to effectively study different hydraulic design alternatives in microirrigation systems. We developed environments in Visual Basic for applications for Microsoft Excel® that allow specific step-by-step functions to be created for the design of irrigation subunits. Different alternatives can be considered, such as types of emitter, lateral and submain pipe sizes, different feeding points, irregular subunit shapes and topography slopes. Furthermore, specific uniformity criteria need to be considered to achieve efficient water applications and proper design systems. Lengths of run lateral and submain pipes, position of the hydrant connection, pressure head and head loss in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation; Emission uniformity; Dripper; Manifold. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000300100 |
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