Computational investigation of vertical slurry jets in water

Azimi, Amir H.; Zhu, David Z.; Rajaratnam, N.

doi:10.1016/j.ijmultiphaseflow.2012.07.002

Cited by 45 publications

(14 citation statements)

References 43 publications

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“…Dredged material can be discharged into the ambient water either instantaneously to form a particle cloud or continuously to form slurry jets/plumes. To study particle clouds and sediment-laden jets/plumes, number of additional parameters such as sand particle size, particle size distribution, shape of sand particles, initial sand velocity, and sand concentration increase the complexity of the problem by generating more interactions among involved parameters (Azimi et al 2011(Azimi et al , 2012a(Azimi et al , 2012b(Azimi et al , and 2014Lai et al 2016aLai et al , 2016b.…”

Section: Introductionmentioning

confidence: 99%

“…In multi-phase flow dynamics, different phenomena occur depending upon the controlling parameters such as, particle concentration and relative size of the particles, and the generated vortices in the ambient water (Gore and Crowe 1989;Crowe 2000;Azimi et al 2012b). Effects of particle size, nozzle diameter and mass of particles on dynamics of particle cloud were studied using dimensional analysis.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on the dynamics of particle clouds in stagnant water using response surface methodology

Pakzad

Azimi

2017

Can. J. Civ. Eng.

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Disposal of sediments during land reclamation and dredging is an important component in many environmental engineering projects. Dredged material can be discharged into the ambient water either instantaneously to form a particle cloud or continuously to form a slurry jet. This paper presents the results of a laboratory experiments to understand the dynamics of particle cloud in stagnant water. Different independent parameters such as particle size, nozzle diameter, cumulative mass of sand particles, and release height were tested. Due to wide ranges of selected variables and interactions between parameters, response surface methodology (RSM) technique was employed to determine the importance and effectiveness of each parameter on the growth and motion of particle clouds. A narrow range of non-dimensional cloud buoyancy in thermal regime was selected for design of experiments. Particle size was found to be the most significant parameter for the response predictions. RSM results showed that increasing the nozzle diameter from 5 mm to 14 mm slightly increased the cloud width if all other parameters kept unchanged. Statistical analysis of results indicated that the effect of the release height on growth of particle cloud was not significant; however, it was effective on variations of frontal velocity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on the dynamics of particle clouds in stagnant water using response surface methodology

Pakzad

Azimi

2017

Can. J. Civ. Eng.

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“…Flow parameters of each phase were coupled via the momentum and mass transfer models. Since the effect of sand particle movement on water was non-negligible, the heterogeneous model was introduced [7]. The interaction between water and sand particles can be demonstrated through the interphase velocity and the interface area [22].…”

Section: Turbulence Modelmentioning

confidence: 99%

“…Alternatively, computational fluid dynamics (CFD) technique can be employed in treating flows in pumps as well as flows exposed to the pumping effect [5,6]. Azimi et al simulated solid-liquid two-phase jets using a commercial CFD code [7]. Gandhi et al obtained numerically the effect of solid-liquid two-phase flows on the performance of a centrifugal pump and proved that both the particle concentration and particle size affect the pump head and efficiency [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Kang

Teng

et al. 2019

Water

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High flexibility of prefabricated pumping stations in collecting and transporting storm water has been recognized. Nevertheless, flows inside such a complex system have rarely been reported. The present study aims to reveal water-sand flow characteristics in a prefabricated pumping station and to optimize geometric parameters of the tank to mitigate sand particle deposition. Five tank schemes, varying in the ratio of the diameter to the height of the tank bottom (D/L), were investigated. Flows in the pumping station were simulated using the computational fluid dynamics (CFD) technique. Test data were used to validate the numerical scheme. Three-dimensional water-sand flows in the pumping station were described. Underlying mechanisms of sand particle deposition were explained. The results indicate that the risk of deposition is high at the tank bottom side, close to the tank inlet. Both the tank bottom geometry and the inlet suction of the pump contribute to sand particle deposition. The averaged sand volume fraction at the pump inlet reaches its minimum at D/L = 3. Sand particle velocity at the pump inlet varies inversely with D/L. The highest intensity of the vortex at the pump inlet arises at D/L = 3. The best anti-deposition performance of the pumping station is attained at D/L = 3.

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“…In the present research, researchers mainly take the mixture model as the main research method. The particle model is also used to study the solid-liquid two-phase flow, but its application to the turbine simulation has rarely been reported [13][14][15]. In this paper, the particle model and the inhomogeneous model are used to simulate and analyze the solid-liquid two-phase flow of the HL240 turbine using the ANSYS-CFX fluid analysis software.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Wear Analysis of Hydraulic Turbines in Solid-liquid Two-phase Flow

Wang

Zhao

2019

Open Physics

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To solve unstable operating and serious wearing of a hydraulic turbine in its overflow parts under solid-liquid two-phase flow, a particle model software and an inhomogeneous model in CFX are used to simulate the hydraulic turbine to understand the wearing of overflow parts and the external characteristics under the solid-liquid two-phase flow. Eleven different conditions at different densities and concentration have been calculated. The simulation results show that the volume distribution of solid particles is larger at the turn of the volute and nose end, resulting in the serious wear in this area. Due to uniform flow at the butterfly edge of volute under solid-liquid two-phase flow, the wear at the entrance of guide vane, the inlet of the blade and the outlet in the shroud is more serious than in other sections. Meanwhile, the collision between the solid phase particles and the overflow components is more intense under solid-liquid two-phase flow in the rotor which can lead to cavitation especially in the outlet and shroud of the blade. In addition, with the increase of density and concentration of solid particles the inlet and outlet pressure difference gradually rises, causing the efficiency loss of the hydraulic turbine.

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Computational investigation of vertical slurry jets in water

Cited by 45 publications

References 43 publications

Investigations on the dynamics of particle clouds in stagnant water using response surface methodology

Investigations on the dynamics of particle clouds in stagnant water using response surface methodology

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Dynamics and Wear Analysis of Hydraulic Turbines in Solid-liquid Two-phase Flow

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