Measurement and Prediction of Total Friction Losses in Drip Irrigation Laterals with Cylindrical Integrated in-line Drip Emitters using CFD Analysis Method

Abstract

The objective of this study was to predict total friction losses in drip irrigation laterals with cylindrical integrated inline emitters at different spacing using Computational Fluid Dynamics (CFD) simulation method. Two types of drip irrigation laterals with different technical specifications were used in the study. In the laboratory, the total friction losses were measured in the laterals for different velocities. In CFD analysis, standard k-ε, RNG k-ε, realizable k-ε, Reynolds Stress (RSM) with Linear Pressure-Strain (LPS) turbulence models and standard wall function, non-equilibrium wall function, enhanced wall treatment were considered. CFD simulation results were compared with experimental total friction losses in laterals. The highest prediction was obtained by RSM turbulence model with LPS using standard wall function with the lowest values of MAPE (2.96%) and RMSE (369 Pa).

Keywords

• Drip irrigation,Pipe,Turbulence models,Computational Fluid Dynamics

References

1. ANSYS Fluent Theory Guide (2016). Release 17.2 August 2016 ANSYS, Inc. Southpointe 2600 ANSYS Drive Canonsburg, PA 15317 A
2. Bagarello V, Ferro V, Provenzano G & Pumo D (1997). Evaluating pressure losses in drip-irrigation lines. Journal of Irrigation and Drainage Engineering ASCE 123(1): 1-7
3. Juana L, Rodriguez-Sinobas L & Losada A (2002). Determining minor head losses in drip irrigation laterals. II: Experimental study and validation. Journal of Irrigation and Drainage Engineering ASCE 128(6): 385-396
4. Palau-Salvador G, Sanchis L H, González-Altozano P & Arviza-Valverde J (2006), Real local losses estimation for on-line emitters using empirical and numerical procedures. Journal of Irrigation and Drainage Engineering ASCE 132(6): 522–530
5. Provenzano G & Pumo D (2004). Experimental analysis of local pressure losses for microirrigation laterals. Journal of Irrigation and Drainage Engineering ASCE 130(4): 318-324
6. Provenzano G, Di Dio P & Palau-Salvador G (2007). New Computational Fluid Dynamic procedure to estimate friction and local losses in coextruded drip laterals. Journal of Irrigation and Drainage Engineering ASCE 133(6): 520–527
7. Provenzano G, Pumo D, Di Dio P, Arviza-Valverde J & Palau-Salvador G (2005). Assessing a Computational Fluid Dynamics technique (CFD) to evaluate pressure losses in co-extruded drip laterals. In: Proceedings of the ASAE International Meeting, Paper Number: 052212, 17-20 July, Tampa Florida
8. Vijiapurapu S & Cui J (2010). Performance of turbulence models for flows through rough pipes. Applied Mathematical Modelling 34(6): 1458–1466

9. Von Bernuth R D & Solomon K H (1986). Design principles-emitter construction (Chapter 2). In: Trickle Irrigation for Crop Production (Nakayama, G S and Bucks, D A eds). Elsevier Science Publishers, The Netherlands
10. Wang W, Wang F & Zhao F (2006). Simulation of unsteady flow in labyrinth emitter of drip irrigation system. Computers in Agriculture and Natural Resources, 4th World Congress Conference, ASABE Publication Number 701P0606, 24-26 July, Orlando, Florida
11. Wei Q, Shi Y, Dong W, Lu G & Huang S (2006). Study on hydraulic performance of drip emitters by computational fluid dynamics. Agricultural Water Management 84(12): 130-136
12. White F M (2001). Fluid Mechanics. 4th Edition, McGraw Hill, New York
13. Zhang J, Zhao W, Wei Z, Tang Y & Lu B (2007). Numerical and experimental study on hydraulic performance of emitters with arc labyrinth channels. Computer and Electronics in Agriculture 56(2): 120-129