Hydraulic characterization of porous pipes made of recycled automobile tires used in subsurface irrigation

作者：Pinto Marinaldo F; de Camargo Antonio P^*; Rettore Neto Osvaldo; Frizzone Jose A

来源：Revista Brasileira de Engenharia Agricola e Ambiental, 2014, 18(11): 1095-1101.

DOI：10.1590/1807-1929/agriambi.v18n11p1095-1101

• microirrigation
• flow rate
• head loss

Even considering the ecological appeal to reuse wastes, the technical feasibility of irrigation products, such as porous pipes made of recycled automobile tires, must be assessed. Besides the hydraulic characterization is one of these technical requirements, it also provides essential data for designing subsurface irrigation systems. The objective of the research was to study the following characteristics of porous pipes: head loss, pressure-flow rate relationship, and variation of flow rate. Five samples of pipe were employed for determining head loss; eigth samples were used for determining pressure-flow rate curves and coefficient of variation evaluating seven pressures. Head loss experiments required pipes externally sealed (waterproofed) as well as pipes operating normally under several flow rates. The coefficient of variation of flow was around 5%, which represents a satisfactory result. The power function did not fit to the experimental data of pressure-flow rate. The head loss coefficient and the friction correction factor due to outflow of emitters presented values which did not match with those found in literature. Effects related to pipe diameter changes due to operating pressure must be taken into account in further studies.

• 出版日期2014-11