Optimization of Geometrical Parameters of Coandă-Effect-Based Polymetallic Nodule Collection Device

doi:10.16183/j.cnki.jsjtu.2023.470

Abstract

Abstract:

The collection of seabed ore particles is a core technology of exploiting deep sea mineral resources, with wall-attached jet collection technology based on Coandă-effect being considered as a nodule collection method with engineering application potential. Based on the experimentally verified CFD-DEM numerical simulation, the optimization of geometric parameters of the collection device is conducted to improve pick-up efficiency. The influences of three geometric parameters, i.e., the ratio of the curvature radius of the convex curved wall to the diameter of the nodule particle R/d, the tangential radian of the jet θ, and the ratio of the thickness of the jet to the diameter of the nodule b/d on the critical unconditional jet flow rate q₀, are investigated and compared. The nodule collection characteristics are revealed through an analysis of the flow field characteristics. The results show that b/d has the greatest influence on the pick-up efficiency, followed by R/d, while θ has the least. The performance of nodule collection is optimal when R/d=9, θ=1.05 rad, and b/d=0.26 in contrast conditions. This research provides technical support for designing and developing the Coandă-effect-based collection devices.

Key words: polymetallic nodule, Coandă-effect-based collection, computational fluid dynamics-discrete element method (CFD-DEM), nodule pick-up efficiency, parametric optimization

CLC Number:

P751

ZHANG Baiyuan, ZHAO Guocheng, XIAO Longfei. Optimization of Geometrical Parameters of Coandă-Effect-Based Polymetallic Nodule Collection Device[J]. Journal of Shanghai Jiao Tong University, 2025, 59(8): 1059-1066.

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编号	网格数量	时间步长/s	η/%	相对差值/%	编号	网格数量	时间步长/s	η/%	相对差值/%
M1	45 375	0.01	72.97	-	T1	73 506	0.020	72.52	-
M2	58 326	0.01	77.22	5.82	T2	73 506	0.015	77.20	6.45
M3	73 506	0.01	80.11	3.74	T3	73 506	0.010	80.11	3.77
M4	106 324	0.01	81.45	1.67	T4	73 506	0.005	81.26	1.44

参数	取值
模拟矿粒密度,ρ_p/(kg·m^-3)	2 300
离底高度,h/mm	30
d/mm	20
R/mm	80
α/(°)	35
b/mm	3.125

几何参数	取值	其他参数	取值
R/mm	140~220	ρ_f/(kg·m^-3)	1 000
α/(°)	50~73	μ/(mPa·s)	1.31
b/mm	0.5~15	U/(m·s^-1)	0.2
h/mm	30	d/mm	20