Study on hydraulic performance of drip emitters by computational fluid dynamics

Wei, Qingsong; Shi, Yusheng; Dong, Wei; Lu, Gang; Huang, Shudong

doi:10.1016/j.agwat.2006.01.016

Cited by 77 publications

(67 citation statements)

References 6 publications

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“…Figure 3 shows the variation of the pressure coefficient with the Reynolds number. Present numerical results are compared to experimental and numerical data available in Wei et al (2006). The agreement with the experiments remains remarkably good in the whole range of the Reynolds number, including the highest considered Re values.…”

Section: Resultsmentioning

confidence: 66%

“…The computational domain has been reconstructed starting from the details reported in Wei et al (2006). We define the number of rectangular obstacles inside the 2D domain (i.e., 8 obstacles): such obstacles are created at fixed distances, then a free passage corresponding to 1/10 of the computational domain length is left at the beginning and at the end of the computational domain, for stability purpose.…”

Section: Simulation Setupmentioning

confidence: 99%

“…This provides the typical framework in which computational fluid dynamics (CFD) can be proficiently employed (Xia and Sun, 2002;Lee, 2013;Lee et al, 2013), to allow an experimental-based optimisation of drip irrigation systems. To date, a few CFD applications to drip emitters can be reported in the scientific literature, all based on well established numerical techniques such as the finite volume method (FVM) or the finite element method (FEM) (Palau-Salvador et al, 2004;Wei et al, 2004Wei et al, , 2006Provenzano et al, 2007;Li et al, 2008;Wu et al, 2013;Yurdem et al, 2015). In Palau-Salvador et al (2004), a finite volume laminar flow model is employed to investigate the pressure vs discharge rate correlation in a straight channel design, showing a good agreement with experimental data.…”

Section: Introductionmentioning

confidence: 99%

“…In Wei et al (2004) a novel channel design is simulated numerically, confirming that the use of CFD can effectively reduce the number of experimental samples and measurements. The FEM method is applied in Wei et al (2006), under a turbulent flow assumption, to explore its reliability in the comparison of several labyrinth channel designs. Wu et al (2013) analyse the effectiveness of the standard k-ε model and the large eddy simulation (LES) method in simulating the fluid dynamics inside drip irrigation emitters and concluded that the LES model is more effective.…”

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confidence: 99%

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Multi-component Lattice Boltzmann simulation of the hydrodynamics in drip emitters

Falcucci

Krastev

Biscarini

2017

J Agricult Engineer

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In this paper, we propose a fast and efficient numerical technique based on the Lattice Boltzmann method (LBM) to model the flow through a reference drip emitter geometry. The aim of the study is to demonstrate the applicability of the LBM as a reliable simulation tool for the hydraulic optimisation of irrigation systems. Results for the water flow through a rectangular drip emitter are in good agreement with literature numerical and experimental data. Furthermore, we demonstrate the feasibility of the proposed model to simulate a multi-component flow that could be used to simulate the presence of additives, contaminants, and suspended particles. IntroductionAs shown in several studies, drip emitters play a major role in the hydraulic performance of drip irrigation systems (Glaad, 1974;Ozekici et al., 1991; Carraro et al., 2006;Li et al., 2006). Glaad (1974) reports several results obtained under laboratory conditions and highlights the effect of structural form, dimension and material of emitter channels on the overall performance of the dripper. In Ozekici et al. (1991), pressure losses during water flow are related to the shape of the emitter channel.However, a detailed experimental observation of the flow pattern through emitter channels has proven to be practically unfeasible, due to their complex shape and very small size (less than 1 mm 2 of cross sectional area). This provides the typical framework in which computational fluid dynamics (CFD) can be proficiently employed (Xia and Sun, 2002;Lee, 2013;Lee et al., 2013), to allow an experimental-based optimisation of drip irrigation systems. To date, a few CFD applications to drip emitters can be reported in the scientific literature, all based on well established numerical techniques such as the finite volume method (FVM) or the finite element method (FEM) (Palau-Salvador et al., 2004;Wei et al., 2004Wei et al., , 2006Provenzano et al., 2007;Li et al., 2008;Wu et al., 2013;Yurdem et al., 2015). In Palau-Salvador et al. (2004), a finite volume laminar flow model is employed to investigate the pressure vs discharge rate correlation in a straight channel design, showing a good agreement with experimental data. In Wei et al. (2004) a novel channel design is simulated numerically, confirming that the use of CFD can effectively reduce the number of experimental samples and measurements. The FEM method is applied in Wei et al. (2006), under a turbulent flow assumption, to explore its reliability in the comparison of several labyrinth channel designs. Wu et al. (2013) analyse the effectiveness of the standard k-ε model and the large eddy simulation (LES) method in simulating the fluid dynamics inside drip irrigation emitters and concluded that the LES model is more effective.A potential candidate for the direct simulation (i.e., without turbulence modelling) of fluid flow in the micro-channels of drip emitters is the Lattice Boltzmann method (LBM), a powerful technique for the computational modelling of a wide variety of complex fluid flow problems (Benzi e...

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Section: Resultsmentioning

confidence: 66%

Section: Simulation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Multi-component Lattice Boltzmann simulation of the hydrodynamics in drip emitters

Falcucci

Krastev

Biscarini

2017

J Agricult Engineer

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“…En los sistemas de riego existen ejemplos en emisores de riego localizado y sistemas de inyección de fertilizantes (Wei et al, 2006; Palau-Salvador et R. Bras. Eng.…”

Section: Introductionunclassified

Diseño y predicción del funcionamiento de inyectores Venturi en riego localizado

Manzano¹,

Azevedo

Bomfim

et al. 2014

Rev. bras. eng. agríc. ambient.

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se ha estudiado el diseño y funcionamiento de cuatro prototipos del inyector Venturi con técnicas de Dinámica de Fluidos Computacional (CFD), comparándo las con ensayos en laboratorio. Para cada prototipo, las geometrías definidas y analizadas han permitido simular el funcionamiento sin (G1) y con inyección (G2) para quimigación. En el caso G1, se presentan los gráficos del perfil de presiones en el eje del inyector para diversas velocidades, así como la distribución del campo de presiones y de la evolución de las diferencias de presión y pérdidas de carga frente al caudal principal. Para comparar los resultados obtenidos con CFD frente al resultado experimental, se calculó el error relativo. En el caso G2, se obtuvo la representación gráfica del el caudal de inyección frente al caudal principal. Las técnicas CFD exigen un buen ajuste del modelo para dar un resultado aceptable. Son interesantes para comparar geometrías, analizar sus variantes, realizar prediseños y aproximar ordenes de magnitud, pero es recomendable su ensayo en laboratorio para validar los resultados. Design and prediction performance of Venturi injectors in drip irrigation A B S T R A C TThe design and prediction performance of four Venturi injector prototypes have been studied using Computational Fluid Dynamics (CFD) techniques. Results were compared with experimental tests carried out in the laboratory of the Universitat Politècnica de València, Valencia, Spain. The analysed and selected geometries for each prototype were used to simulate the operation without nutrient injection (G1) and with nutrient injection (G2). In first case (G1), the results were presented in the form of pressure profile at the injector axe under different velocities and the pressure distribution in the whole geometry. Additionally, this paper analysed the evolution of pressures and head loss versus main water flow in the different prototypes. The relative error was estimated to compare CFD and experimental results. The second case (G2), the graphical representation for the relations between the nutrient aspiration flow and water main flow were obtained for numerical and experiment approaches. In conclusion, CFD techniques appear as a suitable tool for the analysis of the Venturi injector operation, but its validation with experimental data is recommended.Palabras-clave: dinámica de fluidos computacional RANS quimigación

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Influence of Flushing Pressure before Irrigation on the Anti‐Clogging Performance of Labyrinth Channel Emitters

Yang

et al. 2017

Irrigation and Drainage

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This study aimed to investigate the influence of different pressures on the distribution of particle sizes of deposited sediments and discharged sands in the process of flushing, using cylindrical labyrinth channel emitters. Flushing was performed for 2 min before each irrigation under 0.15, 0.20, 0.25 and 0.30 MPa of pressure. The variation in flow discharge with irrigation times was measured after flushing, and a Malvern laser particle size analyser was employed to analyse the gradation of discharged sands. The results of this study suggested that irrigation time with normal outflow rate was remarkably extended and the anti‐clogging performance of emitters was obviously promoted by the increase in flushing pressures. Moreover, the emitters were sensitive to particles larger than 6.607 μm in diameter, which tended to be retained in the flow paths. In contrast, particles smaller than 6.607 μm in diameter flowed out of the labyrinth channel easily. Furthermore, the flushing pressure had a major impact on the larger particles of discharged sediments, whereas it had a minor effect on smaller particles. Increasing flushing pressures appropriately could effectively increase the passing rate of larger particles, thereby extending the lifespan of emitters. Therefore, it is advised to perform high‐pressure flushing for 2–3 min before each irrigation to prevent the clogging of emitters. Copyright © 2017 John Wiley & Sons, Ltd.

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Study on hydraulic performance of drip emitters by computational fluid dynamics

Cited by 77 publications

References 6 publications

Multi-component Lattice Boltzmann simulation of the hydrodynamics in drip emitters

Multi-component Lattice Boltzmann simulation of the hydrodynamics in drip emitters

Diseño y predicción del funcionamiento de inyectores Venturi en riego localizado

Influence of Flushing Pressure before Irrigation on the Anti‐Clogging Performance of Labyrinth Channel Emitters

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