Flow Characteristics and Hydraulic Lift of Coandă Effect-Based Pick-Up Method for Polymetallic Nodule

The deep-sea mining vehicle is the main component of undersea exploitation system, which gathers polymetallic nodules with its professionally designed seabed collector. Coandă effect-based collecting method an improved hydraulic that forms adverse pressure gradient over by performing wall jet flow a rounded convex surface. In comparison to circular cylinder surface, effect logarithmic spiral surface has self-preserving nature, can be advantageous nodule collecting. However, this on lift capability seldom been studied before. present investigation, reduced form modelling flows surfaces was performed study characteristics and ability newly jet-half width optimized influence curvature growth rate. found stronger larger exit velocity, local curvature, or non-dimensional slot height. rate, represents flow, went up in proportion downstream distance. logarithmical x/R = 1 significantly better than 2/3.