New Method of Hydraulic Performance Evaluation on Emitters with Labyrinth Channels
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Volume 137, Issue 12
Abstract
Hydraulic performance of the emitter is crucial in drip-irrigation systems. Considering the limitations of evaluating an emitter’s hydraulic performance, a new method was proposed by using a pressure loss coefficient (PLC) as the evaluation index, which was derived from frictional and local losses of the fluid in labyrinth channels. The value of PLC can be obtained through numerical calculations of flow rates and pressure heads of the emitter by a Reynolds stress model (RSM). In addition, experiments were also carried out to measure the emitter’s PLC, and the results are found to be consistent with those obtained through numerical analysis. The new evaluation method can be used to predict and compare the hydraulic performance of this specific type of labyrinth channel with a range of dimensions.
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Acknowledgments
This work was partially supported by the Fundamental Research Funds for the Central Universities and the Program for Changjiang Scholars and Innovative Research Team in University (No. UNSPECIFIEDIRT0646).
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Published In
Journal of Irrigation and Drainage Engineering
Volume 137 • Issue 12 • December 2011
Pages: 811 - 815
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 11, 2010
Accepted: Apr 5, 2011
Published online: Apr 7, 2011
Published in print: Dec 1, 2011
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