Air-entrainment in hydraulic intakes with a vertical pipe: The mechanism and influence of pipe offset

Huang, Xianbei; Guo, Qiang; Tao, Fang; Xurui, Chen; Qiu, Baoyun

doi:10.1016/j.ijmultiphaseflow.2021.103866

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…For clean water samples, velocity (V) is 2.83 m/s - 7-b). This shows the agreement with Darcy Weisbac's equation which shows an inverse comparison between Re and f [21,22]. The friction coefficient (f) is influenced by the pipe diameter (D), the turbulent, transition, and laminar, Reynolds number (Re), and the pipe roughness (e).…”

Section: Relationship Of Reynolds Number To Flow Velocity (𝑽) and Coe...supporting

confidence: 74%

“…In this study, the analysis of flow characteristics that are occurring in closed channels, using empirical equations, namely flow discharge (𝑄), Reynolds number (𝑅𝑒), friction coefficient (𝑓), energy loss (ℎ𝑓), and hydraulic gradient (ℎ𝑓/𝐿) [21,22]. Measurement of flow velocity (𝑉) using a pitot tube, calculated using the empirical equation:…”

Section: Literature Reviewmentioning

confidence: 99%

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Greywater Flow Characteristics for Closed Channel Maintenance

2023

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Knowing the characteristics of wastewater and its interaction with the channel is crucial to finding a suitable model and maintenance method to solve the closed channel problem. The purpose of this study is to find the relationship and how much it influences the characteristics of wastewater in closed channels and analyze the limit deposit velocity (LDV) of wastewater so that there is no deposition. The parameters used to analyze wastewater characteristics are density, oil and fat, specific gravity, total suspended solids, total dissolved solids, and kinematic viscosity. The parameters used to analyze the flow characteristics in closed channels are velocity, discharge, Reynolds number, friction coefficient, energy loss, and hydraulic gradient. The method used is experimental research by simulating a closed-channel model prototype. The closed channel model is made from an acrylic pipe with a length of 6 m and a pipe diameter of 0.064 m. Simulations on each wastewater sample and the discharge variations used were 0.005, 0.004, 0.003, and 0.0015 m3/s. Velocity measurements at a 0.5 pipe water level height and distances of 0, 2, 4, and 6 m. The results showed that the nature and composition of the wastewater the flow velocity. The large value of wastewater parameters shows that the flow velocity is small. The wastewater content is considered a load that must be transported to the end of the closed channel. When the discharge increases, the velocity will increase, Reynolds number will increase, and the energy loss will be large, while the friction coefficient is inversely proportional to Reynolds number. The velocities of clean water samples are 2.90 - 1.07 m/s, tofu - making is 2.83 - 1.07 m/s, household is 2.74 - 0.85 m/s, laundry is 2.84 - 1.03 m/s, and the workshop is 2.54 - 0.66 m/s. The limit deposit velocity (LDV) for household wastewater is 1.49 m/s to prevent deposition in closed channels. Doi: 10.28991/CEJ-2023-09-01-03 Full Text: PDF

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Section: Relationship Of Reynolds Number To Flow Velocity (𝑽) and Coe...supporting

confidence: 74%

Section: Literature Reviewmentioning

confidence: 99%

Greywater Flow Characteristics for Closed Channel Maintenance

2023

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“…The turbulence model is BM [13][14][15], and the interface tracking method is S-CLSVOF [17,16]. The initial condition and boundary conditions of numerical simulation, as well as the iteration schemes and interpolation schemes are the same as references [4,5].…”

Section: Rsm and Numerical Simulation Descriptionmentioning

confidence: 99%

“…The key to optimizing design lies in selecting appropriate optimization objectives. According to our previous research, the relative air-entrainment rate in the bell mouth suction pipe can measure the degree of the air-entrained vortex and can be used as the objective parameter for optimization [4,5]. There are many adverse flow patterns in the intake, and the air-entrained vortex is only one of them.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of intake parameters based on response surface methodology

Fang,

Huang,

et al. 2024

J. Phys.: Conf. Ser.

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The open intake is an important hydraulic building in pumping stations. This paper adopts the simple coupled level-set and volume of fluid and bifurcation model for numerical simulation. Based on the response surface methodology (RSM), multi-objective optimization of the structural parameters of the open intake is carried out. Considering the air-entrained vortex and irreversible energy loss of the intake pool, the response surface optimization model of the intake is established. The results verify the accuracy of this model. It is shown that the influence of floor clearance and back-wall clearance on the objective function is significant; After gradient optimization calculation, the optimal parameter combination is C = 0.4172D and B = 0.7208D. This optimization scheme suppressed the air-entrained vortex and other adverse flow patterns. And these results provide relevant theoretical references for the future design of intake.

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Flow Characteristics of Hydraulic Intake Structures in Group

Hashid,

Eldho

2024

Lecture Notes in Civil Engineering

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Air-entrainment in hydraulic intakes with a vertical pipe: The mechanism and influence of pipe offset

Cited by 10 publications

References 17 publications

Greywater Flow Characteristics for Closed Channel Maintenance

Greywater Flow Characteristics for Closed Channel Maintenance

Multi-objective optimization of intake parameters based on response surface methodology

Flow Characteristics of Hydraulic Intake Structures in Group

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