| In order to study the relationship between the nozzle diameter, inlet velocity, nodule diameter and the critical lifting height in the process of deep-sea hydraulic mining, the immersed boundary method in the resolved computational fluid dynamics-discrete element method 渊CFD-DEM) is used. Based on the open source software platform of CFDEMcoupling, the cfdemSolverIB solver is used to simulate the process. The flow field is analyzed, and the main reason for the lifting of the nodules is the difference between the upper and lower pressures around the nodules and the velocity difference with the seawater. At the same time, it is found that the nodules leave the seabed slowly during the lifting process, and quickly lift close to the nozzle. As long as the nodules are lifted to a certain height, they can be successfully collected. Under the conditions of different nozzle diameters, inlet velocities and nodule diameters, the vertical height between the nozzle and the seabed is changed, 81 examples are calculated, and the approximate critical lifting height in 27 cases is obtained. According to the data analysis, the relationship between the approximate critical lifting height and the diameter of the mouth, the inlet velocity and the diameter of the nodules is obtained, and the working condition coefficient is linear with the approximate critical lifting height. This paper can provide reference for deep-sea mining operations and subsequent experimental research. |
