Data/hora: 10/06/2024 12:23:25

Provedor de dados: 	70	
País: 	Brazil	
Título: 	Backpressure effects on the flow-pressure relation of driplines	
Autores: 	Thebaldi,Michael S; Lima,Luiz A; Almeida,Willian F. de; Andrade,Rafaella R.	
Data: 	2016-02-01	
Ano: 	2016	
Palavras-chave: 	Discharge exponent; Proportionality constant; Trickle irrigation.	
Resumo: 	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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000100055	
Editor: 	Associação Brasileira de Engenharia Agrícola	
Relação: 	10.1590/1809-4430-Eng.Agric.v36n1p55-62/2016	
Formato: 	text/html	
Fonte: 	Engenharia Agrícola  v.36 n.1 2016	
Fonte: 	info:eu-repo/semantics/openAccess