Deep Seawater flow Characteristics Around the Manganese Nodule Collecting Device

Lim, Sung Jin; Kim, Jong Won; Jung, Shin Taek; Cho, Hong Yeon; Lee, Sang Ho

doi:10.1016/j.proeng.2015.08.324

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…Because the equation (F + F buoy = mg) is the critical condition to trigger the vertical incipient motion of particles, therefore, if C vs determined by D/d and h/d is bigger than that calculated by Equation 15, the particles will be lifted theoretically. Figure 14 shows the tolerance of C vs between the theoretical values by Equation (15) and the predicted values by Equation (17). The dash dotted line and solid line in the graph represent the theoretical values based on two kinds of densities: ρ = 2164.5 kg/m 3 and ρ = 2495.7 kg/m 3 .…”

Section: Criterion-formula Of Vertical Incipient Motion Of Particlesmentioning

confidence: 99%

“…The surface pressures on the sphere and the plane were measured by inclined multi-pipe manometers and the results were compared with photographs showing the flow visualization of the sphere. Lim et al [15] analyzed flow field characteristics with outflow discharge from a collecting device in deep ocean by using software FLUENT. The study revealed seawater velocity and streamline distributions along with complicated flow characteristics downstream including nodule particles behavior.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on Hydraulic Collecting Spherical Particles in Deep Sea Mining

et al. 2018

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Hydraulic collecting is the key technology in deep sea mining and dredging engineering. It determines economic benefits of the project and environmental issues. However, mechanistic studies of hydraulic collecting are rarely described. In this study, the mechanism of collecting spherical particles is researched by dimensional analysis and experimental study. The experimental system is established to carry out three kinds of tests including 253 different test cases. The empirical model of collecting performance prediction is established by the tests of vertical force characteristics and vertical incipient motion characteristics of particles in suction flow field. The results show that the vertical suction force coefficient (Cvs) decreases exponentially with the ratio of bottom clearance to diameter of the particle (h/d), increases linearly with the ratio of diameter of the suction pipe to diameter of the particle (D/d), and is nearly independent of Reynolds number (Re). The empirical formula of vertical force and criterion-formula of vertical incipient motion of particles are obtained with the maximum tolerance less than 15%. The phenomenon that the vortex could help strengthen the suction force was observed in the tests. In addition, the characteristics of suction flow field were obtained by flow visualization tests, and applied to explain the force characteristics of particles in the suction flow field.

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Section: Criterion-formula Of Vertical Incipient Motion Of Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Research on Hydraulic Collecting Spherical Particles in Deep Sea Mining

et al. 2018

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“…In the process of particle collection, the movement characteristics and flow field characteristics of particles in the collection tube are also valuable to study [30]. Lim et al [31] analyzed the flow field characteristics of the acquisition device through Fluent and revealed the velocity distribution characteristics and wake characteristics. Jin et al [32] used floating experiment to study the minimum lifting velocity, established a formula for the floating velocity and determined that the minimum lifting velocity should be twice the floating velocity of the particles.…”

Section: Introductionmentioning

confidence: 99%

“…The CFD-DEM model is mainly used for numerical calculation [32,35]. Previous studies have been conducted on the velocity distribution and particle wake of individual particles collected in vertical pipelines, and research on particle motion characteristics mainly focused on pipelines [31][32][33][34][35][36]. Quantitative studies of single particle suction mainly focus on the influence of size design on particle stress coefficient, including the relationship between h/d, D/d, particle density ρ, particle Froude number Fr and vertical suction number C vs [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study on Flow Characteristics of Hydraulic Suction of Seabed Ore Particles

et al. 2023

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Efficient and environmentally friendly ore collecting operation requires that the ore collecting head can provide just enough suction to start the ore particles in different working conditions. In this work, computational fluid dynamics and discrete element method (CFD-DEM) is used to simulate the hydraulic suction process of ore particles. After analyzing the pressure and velocity characteristics of the flow field, the effects of different suction velocities on the lateral displacement offset, drag coefficient Cd and Reynolds number Rep of particles are studied. It is determined that the lifting force is caused by the different flow velocities of the upper and lower flow fields; particle start-up time and the lateral offset are inversely proportional to suction speed. When h/d ≥ 2.25, the vertical force on particles is no longer affected by h/d. When S/d = 2.5, FZ decreases to 0 N; when h/d increases from 1.5 to 1.75, FZ decreases by nearly half. Three empirical equations for FZ represented by D/d, h/d, and S/d are obtained. After integrating the above three equations, the functional relationship of FZ with D/d, h/d and S/d is finally obtained within a certain range. The errors of the equations are within 6%. The particle stress characteristics obtained in this paper can be applied to the establishment of ore collecting performance prediction model and provide data support for the research and development of intelligent ore collecting equipment.

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“…The geometric considerations and related power consumption were provided in their research. Lim et al [15] analyzed the flow field characteristics with outflow discharge from a collecting device in deep seawater while gathering manganese nodules through computational fluid dynamics simulation. Xiong et al [16] adopted the CFD-DEM method to establish a solid-liquid two-phase flow model in which a single particle leaves the ground and enters the lifting pipe under the action of suction from the vertical pipe.…”

Section: Introductionmentioning

confidence: 99%

Study on Collection Performance of Hydraulic Polymetallic Nodule Collector Based on Solid–Liquid Two-Phase Flow Numerical Simulation

Wang,

Li,

Wei

et al. 2023

Applied Sciences

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The hydraulic collector is an important device for collecting seafloor polymetallic nodules. In this study, a hydraulic polymetallic nodule collector with two acquisition nozzles and one transmission nozzle is described. The numerical model of the hydraulic collector is established based on the solid–liquid two-phase flow method, and it is verified by experimental tests. On this basis, the collection mechanism of the hydraulic collector is analyzed, and the effects of structural parameters and working parameters on its collection performance are explored. The results show that the collection height and slant angle of the acquisition nozzle are key factors for collection efficiency, with optimal heights below 150 mm and angles between 45 and 49∘. The recommended range for the center distance between the two acquisition confluence tubes is 650–730 mm. Excessive acquisition and transmission flow rates make a negligible contribution to improving the collection efficiency, but can also cause a significant increase in energy consumption. Therefore, the recommended ranges for acquisition and transmission flow rates are 140–160 m3/h and less than 80 m3/h, respectively. All of the results indicated that the parameters of the developed hydraulic collector were set reasonably, which thus ensured a balance between the collection efficiency and energy consumption.

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Deep Seawater flow Characteristics Around the Manganese Nodule Collecting Device

Cited by 14 publications

References 4 publications

Experimental Research on Hydraulic Collecting Spherical Particles in Deep Sea Mining

Experimental Research on Hydraulic Collecting Spherical Particles in Deep Sea Mining

Study on Flow Characteristics of Hydraulic Suction of Seabed Ore Particles

Study on Collection Performance of Hydraulic Polymetallic Nodule Collector Based on Solid–Liquid Two-Phase Flow Numerical Simulation

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