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Título: | Methodology for Determining the Emitter Local Head Loss in Drip Irrigation Systems |
Palavras-chave: | Crossflow Head loss (fluid mechanics) Head (fluid mechanics) Trickle irrigation Irrigação por gotejamento Fluxo cruzado Perda de carga (mecânica dos fluidos) Carga (mecânica dos fluidos) |
Data do documento: | Out-2020 |
Editor: | American Society of Civil Engineers |
Citação: | FLORES, J. H. N. et al. Methodology for Determining the Emitter Local Head Loss in Drip Irrigation Systems. Journal of Irrigation and Drainage Engineering, Reston, v. 147, n. 1, Jan. 2021. DOI: https://doi.org/10.1061/(ASCE)IR.1943-4774.0001516. |
Resumo: | Precise estimation of local head loss (hl) remains a challenge for the hydraulic design of drip irrigation. This study develops a robust protocol for estimating the emitter hl based on the Borda-Carnot principle. The method requires cross-sectional flow area measurements with and without emitter obstruction and a contraction coefficient, which is determined by the empirical relationship of the obstruction ratio. For comparison purposes, cross-sectional flow areas were also measured with a profile projector, which resulted in absolute deviations lower than 2.6%. Observed and predicted single-emitter hl deviation values were consistent with previous studies; the three examined emitting pipe types had deviation values of −6.67%, 21.6%, and 1.07%. Thus, the proposed methodology for estimating the cross-sectional area can be applied without compromising hl estimates using a single flat inline emitter operated by the proposed semiempirical model. |
URI: | https://doi.org/10.1061/(ASCE)IR.1943-4774.0001516 http://repositorio.ufla.br/jspui/handle/1/46277 |
Aparece nas coleções: | DEG - Artigos publicados em periódicos |
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