Backpressure effects on the flow-pressure relation of driplines
ABSTRACT For drip irrigation design and management, it is necessary to know the relation between flow and pressure acting on emitters. In the case of subsurface drip irrigation, the backpressure phenomenon may change the hydraulic characteristics of emitters. Thus, this study aimed at determining su...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Engenharia Agrícola
2016-02-01
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| Series: | Engenharia Agrícola |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000100055&tlng=en |
| _version_ | 1818987898957987840 |
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| author | Michael S Thebaldi Luiz A Lima Willian F. de Almeida Rafaella R Andrade |
| author_facet | Michael S Thebaldi Luiz A Lima Willian F. de Almeida Rafaella R Andrade |
| author_sort | Michael S Thebaldi |
| collection | DOAJ |
| description | ABSTRACT For drip irrigation design and management, it is necessary to know the relation between flow and pressure acting on emitters. In the case of subsurface drip irrigation, the backpressure phenomenon may change the hydraulic characteristics of emitters. Thus, this study aimed at determining such relationship between flow and pressure of different driplines in surface and subsurface conditions; aiming to find possible differences in hydraulic behavior. We tested four emitter types; two pressure compensating (D5000 and Hydro PCND) and two non-pressure compensating (TalDrip and Jardiline). Emitter flow rates were attained in atmospheric conditions and submerged in water, in which submergence levels represented backpressure. Assays were performed using inlet pressures of 80, 100, 120, and 150 kPa for the Hydro PCND dripline and 25, 50, 100, and 150 kPa for the other ones; the backpressures were of 0.49, 1.47, 2.45, 4.41 and 6.37 kPa with four replications. The emitters had their proportionality constants and discharge exponents changed in submerged applications, representing backpressure effect. Non-pressure compensating emitters had their discharge exponent decreased, while in pressure compensating ones, it was increased. Backpressure reduced emitter flow rates at all evaluated pressures. |
| first_indexed | 2024-12-20T19:14:01Z |
| format | Article |
| id | doaj.art-fe65e65a752a47c5b2c7dbfb3e27067b |
| institution | Directory Open Access Journal |
| issn | 0100-6916 |
| language | English |
| last_indexed | 2024-12-20T19:14:01Z |
| publishDate | 2016-02-01 |
| publisher | Sociedade Brasileira de Engenharia Agrícola |
| record_format | Article |
| series | Engenharia Agrícola |
| spelling | doaj.art-fe65e65a752a47c5b2c7dbfb3e27067b2022-12-21T19:29:10ZengSociedade Brasileira de Engenharia AgrícolaEngenharia Agrícola0100-69162016-02-01361556210.1590/1809-4430-Eng.Agric.v36n1p55-62/2016Backpressure effects on the flow-pressure relation of driplinesMichael S ThebaldiLuiz A LimaWillian F. de AlmeidaRafaella R AndradeABSTRACT For drip irrigation design and management, it is necessary to know the relation between flow and pressure acting on emitters. In the case of subsurface drip irrigation, the backpressure phenomenon may change the hydraulic characteristics of emitters. Thus, this study aimed at determining such relationship between flow and pressure of different driplines in surface and subsurface conditions; aiming to find possible differences in hydraulic behavior. We tested four emitter types; two pressure compensating (D5000 and Hydro PCND) and two non-pressure compensating (TalDrip and Jardiline). Emitter flow rates were attained in atmospheric conditions and submerged in water, in which submergence levels represented backpressure. Assays were performed using inlet pressures of 80, 100, 120, and 150 kPa for the Hydro PCND dripline and 25, 50, 100, and 150 kPa for the other ones; the backpressures were of 0.49, 1.47, 2.45, 4.41 and 6.37 kPa with four replications. The emitters had their proportionality constants and discharge exponents changed in submerged applications, representing backpressure effect. Non-pressure compensating emitters had their discharge exponent decreased, while in pressure compensating ones, it was increased. Backpressure reduced emitter flow rates at all evaluated pressures.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000100055&tlng=endischarge exponentproportionality constanttrickle irrigation |
| spellingShingle | Michael S Thebaldi Luiz A Lima Willian F. de Almeida Rafaella R Andrade Backpressure effects on the flow-pressure relation of driplines Engenharia Agrícola discharge exponent proportionality constant trickle irrigation |
| title | Backpressure effects on the flow-pressure relation of driplines |
| title_full | Backpressure effects on the flow-pressure relation of driplines |
| title_fullStr | Backpressure effects on the flow-pressure relation of driplines |
| title_full_unstemmed | Backpressure effects on the flow-pressure relation of driplines |
| title_short | Backpressure effects on the flow-pressure relation of driplines |
| title_sort | backpressure effects on the flow pressure relation of driplines |
| topic | discharge exponent proportionality constant trickle irrigation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000100055&tlng=en |
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