Model to design drip hose lateral line using two spacing between emitters

The use of non-pressure compensating drip hose in horticultural and annual cycle fruits is growing in Brazil. In this case, the challenge for designers is getting longer lateral lines with high values of uniformity. The objective of this study was to develop a model to design longer lateral lines using non-pressure compensating drip hose. Using the developed model, the hypotheses to be evaluated were: a) the use of two different spacing between emitters in the same lateral line allows longer length; b) it is possible to get longer lateral lines using high values of pressure variation in the lateral lines since the distribution uniformity stays below allowable limits. A computer program was developed in Delphi based on the model developed and it is able to design lateral lines in level using non-pressure compensating drip hose. The input data are: desired distribution uniformity (DU); initial and final pressure in the lateral line; coefficients of relationship between emitter discharge and pressure head; hose internal diameter; pipe cross-sectional area with the dripper; and roughness coefficient for the Hazen-Williams equation. The program allows calculate the lateral line length with three possibilities: selecting two spacing between emitters and defining the exchange point; using two pre-established spacing between emitters and calculating the length of each section with different spacing; using one emitter spacing. Results showed that the use of two sections with different spacing between drippers in the lateral line didn't allow longer length but got better uniformity when compared with lateral line with one spacing between emitters. The adoption of two spacing increased the flow rate per meter in the final section which represented approximately 80% of the lateral line total length and this justifies their use. The software allowed DU above 90% with pressure head variation of 40% and the use of two spacing between emitters. The developed model/software showed to be accurate, easy to handle and useful for lateral line design using non-pressure compensating drip hose.

Dimensionamento da linha lateral utilizando dois espaçamentos entre gotejadores

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Análise temporal da composição, abundância, diversidade dos Cladocera e crescimento alométrico da Daphnia spp. O. F. Müeller, 1785 na Lagoa do Camargo, lateral ao Rio Paranapanena em sua zona de desembocadura na Represa do Jurumirim

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Distribuição espaço-temporal de Cladocera(Crustácea, Branchiopoda) em uma lagoa subtropical lateral ao Rio Paranapanema(zona de desmbocadura na Represa de Jurumirim/SP)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efferent projections of the suprachiasmatic nucleus based on the distribution of vasoactive intestinal peptide (VIP) and arginine vasopressin (AVP) immunoreactive fibers in the hypothalamus of Sapajus apella

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise dos efeitos das deformações estruturais sobre a transferência transversal de carga em um veículo do tipo fórmula SAE submetido a uma aceleração lateral constante

This paper studies the frame deformations on a formula SAE vehicle in steady-state cornering and its influence on the lateral load transfers and, consequently, on the tires normal loads due to the applied lateral load. For a vehicle with a perfect rigid frame, the vehicle mass, the position of the center of gravity and the suspensions are the only factors responsible for the load distribution between the tires. When the frame deformations are no longer negligible, the frame deformations affect the loaddistribution between the tires. The frame flexibility turns it able to behave as an additional set of springs to the suspension system, thus changing the behavior of the set. This paper describes howit happens and suggests ways to minimize this phenomenon

Alterações na expressão do Hormônio Concentrador de Melanina (MCH) na área hipotalâmica lateral do rato ao longo do desenvolvimento pós-natal e envelhecimento

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Diversity and evolution of sexually dimorphic mental and lateral glands in Cophomantini treefrogs (Anura: Hylidae: Hylinae)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Distribution of melanin-concentrating hormone neurons projecting to the medial mammillary nucleus

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Increasing the lateral line length of drip irrigation systems

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)