Experimental Study of Jet Agitation Effects on Agrochemical Mixing in Sprayer Tanks

Uçar, Tamer; Ozkan, H. E.; Fox, Robert; Brazee, R. D.; Derksen, R. C.

doi:10.1006/jaer.1999.0499

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…Water velocity measurements were made with a constant-temperature hot-film (CTHF) anemometer in an elliptical, 1136 L sprayer tank. Details on the tank and agitation system are given in Ucar et al (2000). The anemometer control unit was a TSI model 1010 (St. Paul, Minn.), and sensors used were model 1210-20W (0.005 cm diameter).…”

Section: Materials and Methods For Validation Experimentsmentioning

confidence: 99%

“…Experiments by Ucar et al (2000) showed that four factors were most influential in agitation system effectiveness. Observations of single-phase flow fields for the 35 agitation systems tested were computed using FLUENT.…”

Section: Fluid Phase Simulations Of Jet Agitators In Sprayer Tanksmentioning

confidence: 99%

“…Comparisons were made for effect of agitation system design and operating parameters such as jet diameter, orientation, velocity, etc. This study was an extension of previous, experimental research on hydraulic agitation systems in agricultural sprayer tanks conducted in 1996 and H 1997 (Ucar et al, 2000). In these studies, kaolin clay was used to simulate a dry pesticide in the mixing tests.…”

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confidence: 99%

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Simulation of Jet Agitation in Sprayer Tanks: Comparison of Predicted and Measured Water Velocities

Uçar¹,

Fox²,

Ozkan³

et al. 2001

Transactions of the ASAE

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FLUENT, a computational fluid dynamics program, was used to investigate flow movements in sprayer tanks with hydraulic jet agitators. Two-and three-dimensional simulations were carried out utilizing single-phase (liquid phase only) and multiphase (solids particles in liquid) models. Earlier experimental studies of agitation effectiveness identified important factors affecting agitation effectiveness. This study was initiated to evaluate simulation as a tool in sprayer agitation system design. Interpretations of the flow field predictions supported previous measurements that determined system pressure to be the most influential factor on agitation effectiveness due to the direct relationship between pressure and jet velocity. Multiphase predictions of particle deposit amounts at the tank bottom were not feasible due to the computational demand of the model, which was an attempt to simulate three-dimensional turbulent flows with solid-liquid mixtures. Quantitative verification of single-phase simulations was accomplished by velocity measurements using hot-film sensors in a sprayer tank. Velocities were measured at 9 locations within the sprayer tank, and 12 jet agitation simulations were used. There were 118 of the 144 measured velocities within 50% of velocities predicted by FLUENT, and 120 of 144 measured velocities were within 0.2 m/s of predicted values. FLUENT-generated values tended to be greater than measured velocities near the top of the tank, and FLUENT velocities were always less than measured velocities at a position near the center of the tank.

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Section: Materials and Methods For Validation Experimentsmentioning

confidence: 99%

Section: Fluid Phase Simulations Of Jet Agitators In Sprayer Tanksmentioning

confidence: 99%

mentioning

confidence: 99%

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Simulation of Jet Agitation in Sprayer Tanks: Comparison of Predicted and Measured Water Velocities

Uçar¹,

Fox²,

Ozkan³

et al. 2001

Transactions of the ASAE

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“…As an alternative to the standardized procedure ISO 5682-2, different methodologies have been proposed such as the use of devices to measure liquid turbulence in the tank [2][3][4][5], image analysis 2 of 12 using tanks with transparent walls [6], and the use of instrumentation to measure fluid velocity inside the tank [2,7]. In addition to experimental measurements, numerical models based on the use of computational fluid dynamics (CFD) have also been applied [8].…”

Section: Introductionmentioning

confidence: 99%

CFD Models as a Tool to Analyze the Performance of the Hydraulic Agitation System of an Air-Assisted Sprayer

et al. 2019

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A computational fluid dynamics (CFD) model of the fluid velocities generated by the agitation system of an air-assisted sprayer was developed and validated by practical experiments in a laboratory. The model was developed considering different settings of the agitation system: Three water levels in the tank (1000, 2000, and 3000 L); two different numbers of active nozzles (2 or 4); and three working pressures of the agitation circuit (8, 10, or 12 bar). Actual measurements of the fluid velocity into the tank were taken using an acoustic Doppler velocimeter (ADV). CFD simulations made it possible to estimate fluid velocities at 38% of the measuring points with relative errors of less than 30%. Additionally, the CFD models have allowed the correct prediction of the general behavior of the fluid in the tank considering mean velocities depending on the setting parameters of the agitation system (water level in the tank, hydraulic circuit pressure, and number of active nozzles).

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“…Por este motivo se han propuesto varias alternativas para estudiar los sistemas de agitación de los tanques, que exploran varias vías [2], como por ejemplo el empleo de medidores de X CONGRESO IBÉRICO DE AGROINGENIERÍA X CONGRESSO IBÉRICO DE AGROENGENHARIA 3 -6 septiembre 2019, Huesca -España turbidez [3,4,5], el estudio de imágenes tomadas en depósitos transparentes [6], o estudiar la agitación de forma indirecta mediante la medición de velocidades dentro del depósito [7]. Otra vía diferente cuyo estudio se ha explorado es el empleo de la dinámica de fluidos computacional (CFD) [8].…”

Section: Introductionunclassified

Estudio de la agitación en tanques de pulverizadores agrícolas mediante simulaciones informáticas

Martínez¹,

Cortés²,

Garasa³

et al. 2019

Congreso Ibérico De Agroingeniería

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Experimental Study of Jet Agitation Effects on Agrochemical Mixing in Sprayer Tanks

Cited by 8 publications

References 8 publications

Simulation of Jet Agitation in Sprayer Tanks: Comparison of Predicted and Measured Water Velocities

Simulation of Jet Agitation in Sprayer Tanks: Comparison of Predicted and Measured Water Velocities

CFD Models as a Tool to Analyze the Performance of the Hydraulic Agitation System of an Air-Assisted Sprayer

Estudio de la agitación en tanques de pulverizadores agrícolas mediante simulaciones informáticas

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