Simulation of local head loss of drip-irrigation tape with integrated in-line emitters as a function of cross section

Aim of study: To investigate how the cross section a drip-irrigation tape affects local head loss.Area The work was carried out in laboratory Irrigation hydraulics, College Water Conservancy and Environment, Three Gorges University, Yichang, Hubei province.Material methods: Tapes with six different wall thicknesses were studied experimentally to determine relationship between cross-section deformation, thickness, pressure. Based on experimental results, we determined factors that influence loss tapes by numerical simulation dimensional analysis.Main results: cross-sectional shape varied pressure: under low pressure, nearly elliptical. strongly influenced loss, which inversely proportional 0.867th power flattening coefficient drip irrigation tape. We expressed equipped integrated in-line emitters considering deformation section. Under conditions used this study, when is circular, ratio frictional about 10% but, elliptical, increased 15%.Research highlights: elliptical Local flatting 1.5 times for than circular