Premium
Simulation of Local Head Loss in Trickle Lateral Lines Equipped with In‐line Emitters Based on Dimensional Analysis
Author(s) -
Wang Yalin,
Zhu Delan,
Zhang Lin,
Zhu Shijiang
Publication year - 2018
Publication title -
irrigation and drainage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 38
eISSN - 1531-0361
pISSN - 1531-0353
DOI - 10.1002/ird.2273
Subject(s) - head (geology) , hydraulic head , common emitter , trickle , laminar flow , mechanics , drip irrigation , friction loss , line (geometry) , materials science , flow (mathematics) , physics , engineering , geology , geotechnical engineering , geometry , irrigation , mathematics , computer science , optoelectronics , world wide web , ecology , geomorphology , biology
in order to investigate local head loss in trickle lateral lines equipped with integrated in‐line emitters, experiments were conducted on four common drip irrigation pipes of varying size, and CFD software was used to simulate and verify the results. Simulations of total head loss agreed well with the experimental data. Local head loss was related to the inner diameter of laterals, inner diameter of emitters, emitter length, water flow velocity, and kinematic viscosity. The ratio of local head loss to frictional head loss was closely related to emitter spacing. For example, the local head loss in a drip irrigation pipe with a 16 mm diameter was 0.23 ~ 1.89 times the frictional head loss. Local head loss in laterals is small under laminar flow conditions and can be neglected in most cases. This research provides a reference for hydraulic calculations of pipe networks. © 2018 John Wiley & Sons, Ltd.