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	Provedor de dados AGRIAMBI (2) Autor Bombardelli,Wagner W. Á. (2) Camargo,Antonio P. de (2) Frizzone,José A. (2) Lavanholi,Rogério (1) Melo,Verônica G. M. L. de (1) Rocha,Hermes S. da (1) Mais... Palavra-chave Buckingham Pi theorem (1) Design (1) Diameter change (1) Dimensional analysis (1) Hydraulics (1) Lateral line (1) Operating pressure (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2019 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Local head loss caused in connections used in micro-irrigation systems AGRIAMBI Bombardelli,Wagner W. Á.; Camargo,Antonio P. de; Frizzone,José A.; Lavanholi,Rogério; Rocha,Hermes S. da. ABSTRACT Information about local head loss caused by connections employed in micro-irrigation systems is hard to be found in literature. The objective of this research was to experimentally determine the local head losses in connections commonly used in micro-irrigation and propose mathematical models using the theorem of Buckingham. The methodology of tests was based on international standards. The tests were carried out under controlled inlet pressure, at 150 kPa, and five to ten units of each connection model were tested. The curves relating flow and head losses were drawn based on 15 flow conditions, obtained under increase and decrease of flow rate. For each condition, 30 points were collected resulting in a sample size of 900 points in each test. For... Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydraulics; Dimensional analysis; Buckingham Pi theorem. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000700492 Head loss in laser-perforated thin-walled polyethylene pipes for irrigation AGRIAMBI Melo,Verônica G. M. L. de; Frizzone,José A.; Camargo,Antonio P. de; Bombardelli,Wagner W. Á.. ABSTRACT For reducing fixed and operational costs in pressurized irrigation systems, thin-walled polyethylene pipes with laser-perforated orifices are manufactured to operate under low pressure (up to 100 kPa). Hydraulic characterization of these materials is essential for designing irrigation systems. Considering the material elasticity and the thin wall thickness (about 200 μm), the internal diameter of these pipes may vary according to the operating pressure, resulting in changes of head losses. The purpose of this study was to analyze the head loss in flexible pipes with laser-perforated orifices, and to estimate the maximum length of laterals based on criteria of water distribution uniformity. Non-perforated pipe samples were tested to obtain... Tipo: Info:eu-repo/semantics/article Palavras-chave: Operating pressure; Diameter change; Design; Lateral line. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000500317 Registros recuperados: 2 Primeira ... 1 ... Última

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