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The collection of seabed ore particles is a critical phase in the development of deep-sea mineral resources. The wall-jet nodule-collection device has significant engineering value due to its high collection efficiency and minimal disturbance to the surface sediment of the seabed. In this study, high-speed imaging and computer-based image processing techniques were employed to investigate the influence of the jet Reynolds number (Re) on the dynamic behavior of ore particles. Based on Particle Image Velocimetry (PIV), the impact of Re, height-to-particle-diameter ratio (h/d), and jet thickness-to-particle-diameter ratio (b/d) on the distribution characteristics of the mining flow field were analyzed. The experimental results reveal that ore particles demonstrate distinct movement characteristics in different regions of the collection flow field. These regions are categorized into a translation zone, a startup zone, and a continuation zone. Under the same Re, in the range of 1.5 ≤ h/d ≤ 2.25, decreasing h/d had a limited impact on the flow characteristics near the lowest point of the convex curved wall (y/d = 0), and facilitated ore particle entry into high-velocity gradient flow regions near the wall, thereby effectively promoting particle elevation. Under the same Re, for the range of 0.1 ≤ b/d ≤ 0.4, reducing b/d increased the velocity gradient of the high-speed flow region near the wall, and enhanced the vertical lifting force on particles, improving collection efficiency. This study offers valuable insights for the design and engineering application of new, efficient, and low-disturbance collection devices.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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