Abstract
A subsurface drip irrigation system delivers water and nutrients directly to the plant root zone; other conventional nozzles-type or sprinklers-type irrigation are not used, and water-saving can reach 42–78%. In order to achieve this impact effectively, the drip irrigation requires a constant water supply under variations in pressure, which is so-called pressure compensating (PC) performance. The pressure compensating feature can be obtained by physical interaction between water flow and deformable silicone rubber in the PC dripper. In addition, pressure condition to ensure uniform water flow as a tresholding point also should be well designed, but it is generally have relied on the empiricial optimization. Here, we applied computational fluid dynamics to investigate water flow features in terms of flow rate and pressure drop of a conventional PC dripper. To understand the quantitative effects of changes in design parameters, we explored the fluid-structure interaction scheme in the CFD analysis between water flow and silicone rubber deformation. In this study, it is found that the marginal space for the silicone rubber deformation determined the threshold pressure condition; the friction condition of the tortuous channel of the dripper controlled the flow rate. This parametric study gave the logical insight to design new drip emitter with well-controlled and improved performance.
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Abbreviations
- G :
-
Shear modulus
- E :
-
Elastic modulus
- v :
-
Poission ratio
- P :
-
Pressure
- Q :
-
Volumetric flow rate
- R f :
-
Flow resist
- u :
-
Velocity
- A c :
-
Cross area
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Acknowledgments
This research was supported by the Agenda Project of the Rural Development Administration (Development of Weather Accident Response Technology) in 2021 (Project No. PJ01515 403).
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WoongBhin Kang is an undergraduate student in Kyungpook National University (South Korea) for Bachelor degree in Department of Precision Mechanical Engineering.
SeolHa Kim graduated from POSTECH, for Bachelor (Mechanical engineering) to and Doctor degree (Nuclear engineering). He worked in Korea Atomic Energy Research Institute and Chinese Academy of Science for researcher. Currently, He is working in Kyungpook National University as an Assistant Professor.
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Kang, W.B., Kim, J., Mo, H. et al. A fluid-structure interaction analysis of design factor of subsurface irrigation PC dripper. J Mech Sci Technol 36, 3469–3475 (2022). https://doi.org/10.1007/s12206-022-0624-6
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DOI: https://doi.org/10.1007/s12206-022-0624-6