The minimum MAE (0.021 L h-1) and RMSE (0.028 L h-1) values were found in the SST k- low-Re corr. turbulence model and the minimum MAPE (1.068%) was found in the laminar turbulence model.
📌 3 Maddede Bu Makale
🎯
Amaç & Hipotez:The objective of this study was to determine the hydraulic properties of a flat type emitter using Computational Fluid Dynamics with different turbulence models and model options.
📊
Temel Bulgular & Veri:The lowest mean percentage deviation between the measured flow rates and the calculated flow rates with turbulence models was found as 0.70% and 0.74% in the SST k- and Stress-Omega RSM turbulence model for the wall thickness of 0.25 mm pipe, respectively.
💡
Sonuç & Katkı:The minimum MAE (0.021 L h-1) and RMSE (0.028 L h-1) values were found in the SST k- low-Re corr. turbulence model and the minimum MAPE (1.068%) was found in the laminar turbulence model.
The objective of this study was to determine the hydraulic properties of a flat type emitter using Computational Fluid Dynamics with different turbulence models and model options. In addition, it is aimed to investigate the effects of the emitter hydraulic properties on the design when the same emitter is used in drip irrigation pipes with different wall thicknesses. The lowest mean percentage deviation between the measured flow rates and the calculated flow rates with turbulence models was found as 0.70% and 0.74% in the SST k- and Stress-Omega RSM turbulence model for the wall thickness of 0.25 mm pipe, respectively. Also, the mean percentage deviation for the laminar turbulence model was found to be -1.01%. The minimum MAE (0.021 L h-1) and RMSE (0.028 L h-1) values were found in the SST k- low-Re corr. turbulence model and the minimum MAPE (1.068%) was found in the laminar turbulence model.
DEMİR, V., YÜRDEM, H., YAZGI, A., GÜNHAN, T. (2020). Determination of the Hydraulic Properties of a Flat Type Drip Emitter using Computational Fluid Dynamics. Tarım Bilimleri Dergisi, Cilt: 26 - Sayı: 2, 226–235. https://ajindex.com/articles/178401
Fluent Theory Guide, Release 17.2, ANSYS, Inc. Bralts VF, Wu IP (1979). Emitter flow variation and uniformity for drip irrigation. ASAE Paper, St Joseph, MI, USA. Cicconi P & Raffaeli R (2009). A Knowledge Based Approach for Affordable Virtual Prototyping:the Drip Emitters Test Case. In: Proceedings of the 19th CIRP Design Conference – Competitive Design, 30-31 March 2009,
Cranfield University, UK Dazhuang Y, Peiling Y, Shumei R, Yunkai L & Tingwu X (2007). Numerical study on flow property in dentate path of drip emitters. New Zealand Journal of Agricultural Research 50(5): 705-712
Ding C, Lam K P & Feng W (2017). An Evaluation Index for Cross Ventilation Based on CFD Simulations and Ventilation Prediction Model Using Machine Learning algorithms. Procedia Engineering 205(2017) 2948–2955
Li Y K, Yang P L, Ren S M & Xu T W (2006). Hydraulic characterizations of tortuous flow in path drip irrigation emitter. Journal of Hydrodynamics (B) 18(4): 449-457
Li Y K, Yang P L, Xu T W, Ren S M, Lin X G, Wei R J & Xu H B (2008). CFD and digital particle tracking to assess flow characteristics in the labyrinth flow path of a drip irrigation emitter. Irrigation Science 26:427–438
Liu H S, Li Y K, Liu Y Z, Yang P L, Ren S M, Wei R J & Xu H B (2009). Flow characteristics in energy dissipation units of Labyrinth path in the drip irrigation emitters with DPIV technology. Journal of Hydrodynamics 21(6): 137-145 Mizyed N & Kruse E G (1989). Emitter discharge evaluation of subsurface trickle irrigation systems. T ASAE 32(4): 1223-1228
Munson B R, Young D F & Okiishi T H (2006). Fundamentals of Fluid Mechanics. 6th Edition,
J. Wiley and Sons Palau-Salvador G, Arviza-Valverde J & Bralts V (2004). Hydraulic flow behaviour through an in-line emitter labyrinth using CFD techniques. In: Proceedings of the ASAE/CSAE Annual International Meeting, 042252, 1-4
August, Ottawa, Canada Patil S S, Nimbalkar P T & Joshi A (2013)
Hydraulic Study, Design & Analysis of Different Geometries of Drip Irrigation Emitter Labyrinth, International Journal of Engineering and Advanced Technology (IJEAT) 2(5):455-462
Philipova N, Nikolov N, Pichurov G & Markov D (2009). A mathematical model of drip emitter discharge depending on the geometric parameters of a labyrinth channel. In: 11th National Cong on Theor & App Mech, 2-5 Sept. 2009,
Borovets, Bulgaria Versteeg H K & Malalasekera W (1995). An Introduction to Computational Fluid Dynamics: The Finite Volume Method. Wiley, New York Von Bernut