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

Tang, Pan; Juárez, Juan Manzano; Li, Hong

doi:10.3390/w11102194

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…The gravity in the Z direction was considered, and the gravitational acceleration was −9.81 ms −2 . The standard k-ε, turbulence model [18,19] was chosen, and the near wall treatment was the standard wall functions. The fertilizer that was injected into the pipe was the solution of water and water-soluble solid fertilizer.…”

Section: Governing Equationmentioning

confidence: 99%

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Research on Mixing Law of Liquid Fertilizer Injected into Irrigation Pipe

Zhang

Chen

et al. 2022

Horticulturae

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The time and position that fertilizer takes to uniformly mix with water in an irrigation system significantly affects the development of a fertilization strategy. A pipe irrigation system was used to study the fertilizer–water mixing law in irrigation pipes using numerical simulation and experiments. The effect of the diameter of the water pipe and fertilizer pipe, water and fertilizer flow rates, concentration and viscosity of fertilizer, frequency of fertilizer injection on the mixing speed, and uniform mixing length indicated that the frequency of fertilizer injection did not affect the mixing process. The increase in the water pipe diameter and fertilizer flow rate or the decrease in fertilizer pipe and water flow rate diameter result in the increase of the speed of fertilizer solution mixing with water along the radial direction of the mixing pipe. The uniform mixing length was directly proportional to the fertilizer pipe diameter, water pipe diameter, water flow rate, and fertilizer viscosity, while it was inversely proportional to the flow rate and concentration of fertilizer. The relationship between the uniform mixing length and six influencing factors was fitted, the fitting was highly accurate, and the fitting equation can be used to predict the uniform mixing length under other conditions.

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Section: Governing Equationmentioning

confidence: 99%

“…The uniform mixing lengths under different working conditions are shown in Table 4. The fitting coefficient a, b, e, and f can be obtained by substituting the data in Table 4 into Equation (19), and L u can be estimated through Equation ( 20):…”

Section: Dimensional Analysis Of the Uniformity Mixing Lengthmentioning

confidence: 99%

Research on Mixing Law of Liquid Fertilizer Injected into Irrigation Pipe

Zhang

Chen

et al. 2022

Horticulturae

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“…The pipeline is a mixing process of brine and water. Since the two materials in the mixing process can be mutually soluble in any proportion, a component transport model is adopted (Mohammed et al 2018;Tang et al 2019), which can simulate the interaction between each component of the mixture or with other phases. Therefore, this model is widely used to solve the problem of molecular exchange between two substances.…”

Section: Governing Equationmentioning

confidence: 99%

Diffusion of point source pollution at the cross joint

Sun

Peng

et al. 2022

Water Supply

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The cross joint is one of the standard connection types for urban water supply pipelines. The pipeline containing cross joints was taken as the research object using NaCl as the tracer. The turbulent mixing characteristics of water and pollutants at the cross joints and pollutant's migration and diffusion were studied and analysed by numerical analysis and experimental measurement. The primary purpose is to check the comprehensive influence of six factors, such as pipe diameter, inlet flow ratio, outlet flow ratio, location of damage point, flow of brine, and density of brine, on the turbulent mixing of water and brine in the pipeline. The coefficient of variation is used as an evaluation index to evaluate the mixing in the pipeline, and the effective mixing length LEML is used to quantitatively quantify the uniform mixing position of brine in the pipeline. The results show that the inlet flow ratio, outlet flow ratio, and pipe diameter significantly affect LEML in the east outlet of the cross joint. Outlet flow ratio and pipe diameter significantly affect LEML in the cross joint's south outlet direction. In addition, the dimensionless relationship equation representing LEML is fitted through dimensional analysis.

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“…There are many geometrical and operational parameters that have significant impact on the performance of cavitation or mixing in a Venturi tube, such as the throat length, the throat diameter, the convergent and divergent angles, the inlet and outlet pressures, and the injection of gas or solid particles [5][6][7][8][9][10]. Any change made to one or several of the above-mentioned parameters will result in a drastic change in the mixing and mass transfer rate.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Inflow Swirl on Cavitating and Mixing Processes in a Venturi Tube

Shi

Nikrityuk

2020

Fluids

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A study of the mixing flows (Schmidt number = 103) in a cavitating Venturi tube that feature linear and swirling flows is presented in this paper. The Large Eddy Simulation (LES) turbulence model, the Schnerr–Sauer cavitation model, and the mixture multiphase model, as implemented in the commercial CFD ANSYS FLUENT 16.2, were employed. The main emphasis is spending on the influence of different inlet swirling ratios on the generation of cavitation and mixing behaviors in a Venturi tube. Four different inflow regimes were investigated for the Reynolds number Re = 19,044, 19,250, 19,622, 21,276: zero swirl, 15% swirl, 25% swirl and 50% swirl velocity relative to the transverse inflow velocity, respectively. The computed velocity and pressure profiles were shown in good agreement with the experiment data from the literature. The predicted results indicate that the imposed swirl flow moves the cavitation bubbles away from throat surfaces toward the throat axis. The rapid mixing between two volumetric components is promoted in the divergent section when the intense swirl is introduced. Additionally, the increase in the swirl ratio from 0.15 to 0.5 leads to a linear increase in the static pressure drop and a nonlinear increase in the vapor production. The reduction in the fluid viscosity ratio from μ2μ1=10 to μ2μ1=1 generates a high cavitation intensity in the throat of the Venturi tube. However, the changes in the pressure drop and vapor volume fraction are significantly small of pure water flow.

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

Cited by 10 publications

References 28 publications

Research on Mixing Law of Liquid Fertilizer Injected into Irrigation Pipe

Research on Mixing Law of Liquid Fertilizer Injected into Irrigation Pipe

Diffusion of point source pollution at the cross joint

The Influence of Inflow Swirl on Cavitating and Mixing Processes in a Venturi Tube

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