Analysis of Non-Dimensional Parameters for Double-Row Jet Hydraulic Collection Method on Flow Field Characteristics

Mineral collecting technology is both a core functional module and a major source of perturbation in deep-sea mining. Achieving low environmental disturbance and high collection efficiency in collection technology remains a challenging issue nowadays. In this study, the numerical simulation method validated by experimental results is used to analyze the effects of structural and dynamical dimensionless parameters on the flow field characteristics for the double-row jet hydraulic collection method. The results indicate that with the increase of the velocity ratio, the bottom flow pattern can be divided into three stages: jet dominated, transition and suction dominated. When the suction velocity remains constant, the bottom flow pattern gradually shifts to a suction-dominant state as the suction pipe width increases Average vertical velocity elevates with the narrowing of the suction width (b) at fixed Re settings. Furthermore, the bottom flow pattern gradually shifts to jet-dominated state as the ratio of nozzle distance from suction pipe to suction pipe width increases. Finally, the relative lifting force decreases exponentially with the increase in the relative diameter. The prioritization of three length parameters for bottom flow field impacts was achieved.