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Use of pulsating pressure in the clogging prevention of non-regulated drippers

Grant number: 18/12006-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2018
Effective date (End): November 30, 2019
Field of knowledge:Agronomical Sciences - Agricultural Engineering - Soil and Water Engineering
Principal researcher:João Carlos Cury Saad
Grantee:Caio Nascimento Fernandes
Home Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil


Non-regulated emitters are widely used in drip irrigation systems due to their structural simplicity and low manufacturing cost, however, they are very sensitive to obstruction, even using a filter system. The pulsating pressure occurs when the pressure is continuously varied in cycles. A cycle is the time interval comprising a continuous increase of pressure to an upper limit value immediately followed by a continuous decrease of pressure until a limit value lower, which could prevent clogging of emitters. The objective of this research is to verify if pulsating pressure prevents the clogging of non-regulated drippers, compared to the use of constant pressure. A commercial model of dripper with labyrinth system will be used to evaluate three treatments: a) pulsating pressure irrigation with a cycle of one minute; b) pulsating pressure irrigation with a cycle of thirty seconds; c) irrigation with constant pressure. The tests will be carried out on a test bench and will follow the ISO 9261 standard. Each treatment will have 50 drippers (repetitions). To reproduce the field conditions, pool filter sand will be added in the irrigation water at the concentration of 500 mg.L-1 in two granulometric ranges (53 to 105 ¼m and 250 to 500 ¼m). The indicators of the drippers performance will be emitter flow (Lh-1), relative flow (QRx), Christiansen uniformity coefficient (CUC), distribution uniformity coefficient (CUD), emitter equation and manufacturing coefficient (CVf).

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FERNANDES, CAIO NASCIMENTO; SAAD, JOAO CARLOS CURY. valuation of Pulsating Pressure and Emitter Position in Preventing Drip Emitters from Cloggin. JOURNAL OF IRRIGATION AND DRAINAGE ENGINEERING, v. 148, n. 3 MAR 1 2022. Web of Science Citations: 0.

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