| Autor: |
Luiz Antonio de Andrade, João Carlos Cury Saad, Bruno Marcos Nunes Cosmo, João Victor Costa, Willian Aparecido Leoti Zanetti |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Revista Ambiente & Água, Vol 16, Iss 2, Pp 1-12 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1980-993X |
| DOI: |
10.4136/ambi-agua.2676 |
| Popis: |
A challenge for the design of drip irrigation systems with non-pressure compensated emitters is to increase the maximum length of the lateral lines without significantly reducing water application uniformity. This work evaluated the effect of the flow-rate variation and the local head loss in the maximum length of drip tape with a non-pressure compensated flat emitter. The tests were carried out in a laboratory, using a collapsible drip tape non-pressure compensated in three 50-meter segments. The production line was configured to generate drip tapes without insertion of emitters and with closed emitters (0.30 m spacing). The experimental local head loss was compared with the Darcy-Weisbach equation's estimates using the Blasius friction factor. In the sequence, simulations were generated for the flow-rate variations of 10 and 20% for the emitter spacings of 0.30, 0.40, and 0.50m. The results showed that the local head loss had little influence on the lateral line's maximum length, generating variations of 2.5% on average. However, increasing the allowable flow rate variation from 10 to 20% resulted in a 34% increase in the lateral line maximum length. Also, the reduction in uniformity coefficients was less than 5%, enabling the indexes to remain above 90%. The adoption of higher flow rate variation values allowed gains in the lateral line length with a small decrease in uniformity, making it an alternative to reduce design and operational costs. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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