Geometry and head loss in Venturi injectors through computational fluid dynamics

Manzano, Juan; Palau, Carmen Virginia; Azevedo, Benito Moreira de; Bomfim, Guilherme Vieira do; Vasconcelos, Denise Vieira

doi:10.1590/1809-4430-eng.agric.v36n3p482-491/2016

Cited by 9 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Lu et al [10] conducted a series of experiments to investigate the effect of geometry parameters (contraction angle, throat diameter, throat length and diffusion angle) on the conveying properties and on the pressure reduction effects in the flow of gas-solid mixtures through the Venturi tube. Manzano et al [11] analyzed their influence of structural parameters on the velocity distribution. Zhang [1] investigated the influence of the contraction ratio, the ratio of the throat section length to diameter, the diffusion angle and the differential pressure between inlet and outlet on the mass flux and asymmetric flow.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Tang

Juárez

2019

Water

View full text Add to dashboard Cite

The venturi tube is a special kind of pipe which has been widely applied in many fields. Cavitation is one of the most important research issues for the Venturi tube. Hence, three key structural parameters (contraction angle, diffusion angle and contraction ratio) were selected to investigate the influence of different factors on cavitation characteristics, using the computational fluid dynamics (CFD) method. A series of experiments for measuring the relationship between differential pressure and flow rate were carried out to verify the accuracy of the simulation method. Results showed that the simulation results had a high accuracy and the numerical method was feasible. The average vapor volume fraction of cross-section from the throat in the axial direction increased with increasing contraction angle. The cavity length increased with increasing contraction angle. The average volume fraction in the diffusion section rapidly decreased with increasing diffusion angle. The diffusion angle had no significant effect on the cavitation characteristics in the throat section and had a significant influence in the diffusion section. The average vapor volume fraction increased with decreasing contraction ratio. The contraction ratio had no significant effect on the cavity length under the same differential pressure. The average vapor volume fraction increased with decreasing contraction ratio. However, the variation in the throat section was less than the diffusion section. Under the same inlet and outlet pressure, the cavity lengths for different contraction ratios were basically the same, which indicated that the contraction ratio had no significant effect on the cavity length.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Tang

Juárez

2019

Water

View full text Add to dashboard Cite

show abstract

“…Computational Fluid Dynamics (CFD) is a numerical technique used for solving complex problems in modern engineering practice (Tu et al, 2018). Studies in this field have validated the use of the CFD technique in simulating accessories and/or analysis of flow behavior (Manzano et al, 2016;Silva et al, 2016), including the above-mentioned devices (Holm et al, 1995;Chen et al, 2015;Weissenbrunner et al, 2016). Studies related to these flowmeters estimate metering precision with different types of accessories installed in different positions, degrees of closure and distances from the meter, etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of upstream disturbances on the performance of electromagnetic and ultrasonic flowmeters

Palau

Bomfim

Azevedo

et al. 2020

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

Electromagnetic and ultrasonic flowmeters are high precision devices that can measure the water flow in pressurized irrigation networks. In these networks, the inadequate installation distance of flow control valves generates upstream disturbances which will increase measurement errors and reduce the accuracy of the equipment. Therefore, estimating these errors is important to establishing the correct installation distance of the hydraulic accessories and to ensuring the metrological reliability of the flowmeters. This work proposes a numerical study using Computational Fluid Dynamics to evaluate water flow behavior in pipes and estimate measurement errors caused by gate and butterfly valves in installation configurations found at pressurized irrigation networks. The numerical simulations were made for gate (15, 50 and 75 % closed) and butterfly (open and 30º closed) valves installed three and six diameters (3D and 6D) from the flowmeters. The numerical study with three-dimensional simulation allows for evaluating the flow behavior and estimating measurement errors correctly. According to the study, the installation configurations of the gate and butterfly valves change the flow velocity profile at different positions in the pipe, generating both positive and negative measurement errors at both flowmeters. Among the tested configurations, only the butterfly valve installed 3D and 6D from the electromagnetic flowmeter ensured the measurement accuracy required by ISO 4064.

show abstract

“…At present, the commonly used injectors include the Venturi injector, differential pressure tanks, and other different types of pumps [10][11][12]. Many scholars have conducted detailed studies on Venturi injectors and differential pressure tanks [13][14][15][16]. A low equipment cost, low energy consumption and high injection precision are necessary to improve the water and chemical distribution uniformity and realize the precise control of water and chemicals [17,18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Tang

Chen

Hong

2020

Water

View full text Add to dashboard Cite

Injectors are key pieces of equipment for chemigation systems, and their hydraulic performance has a significant effect on chemigation systems and crops. In order to investigate the influence of different working parameters on hydraulic performance for a water-powered proportional injector (PI), three key parameters of inlet and injection flow rate were researched using a one-factor experimental design method. The regression equations between different factors and response variables were established through a response surface method based on one-factor experimental results. Lastly, a mathematical model of the actual injection ratio was established. Some experiments under different, randomly selected parameter combinations were carried out to verify the prediction precision of the mathematical mode. The results showed that the injection flow rate increased first within the differential pressure of 0.05 to 0.10 MPa and then tended towards stability with increasing differential pressure. The injection flow rate decreased by increasing the viscosity and the change in the injection flow rate was small enough when the viscosity was greater than 500 mPa·s. The impact factors, in order of significance, for inlet flow rate were differential pressure, viscosity of injection liquid and setting injection ratio. The impact factors, in order of significance, for injection flow rate were viscosity of injection liquid, setting injection ratio and differential pressure. The regressive model for predicting the actual injection ratio was validated using an experiment and the relative deviation between calculated value and tested value was less than 5.98%, which indicated that the mathematical model had high credibility.

show abstract

Geometry and head loss in Venturi injectors through computational fluid dynamics

Abstract: ABSTRACT:To determine the influence of geometry on the hydrodynamic behavior of Venturi injectors, using computational fluid dynamics techniques, we studied, at

Cited by 9 publications

References 11 publications

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Numerical study of upstream disturbances on the performance of electromagnetic and ultrasonic flowmeters

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Contact Info

Product

Resources

About