The jet dynamics of a cavitation bubble near unequal-sized dual particles is investigated employing OpenFOAM, and the effects of the jets on the particles are quantitatively analyzed in terms of their pressure impacts. Different from single-particle cases, the necks that evolve between dual particles are closely linked to the formation mechanism of the jets. Based on the simulation results, the jet dynamics can be divided into five scenarios: (1) the contraction of the annular depression produced by the collision of the two necks causes the bubble to split into two daughter bubbles and generates a single jet inside each daughter bubble; (2) the annular depression impacts the particle, leading to the bubble to fracture and producing a single jet inside a daughter bubble; (3) the bubble is split by a single neck constriction and produces a single jet; (4) the bubble is split by a single neck constriction and generates two jets; and (5) the bubble is split by the contraction of two necks and produces four jets together with three daughter bubbles. As the bubble–particle distance or the radius ratio of the dual particles increases, the maximum force on the small particle generated by the bubble decreases.

中文翻译：

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不等尺寸双粒子附近空化泡的射流动力学


采用 OpenFOAM 研究了不等尺寸双颗粒附近空化气泡的射流动力学，并根据压力影响定量分析了射流对颗粒的影响。与单粒子情况不同，双粒子之间演化的颈部与射流的形成机制密切相关。根据模拟结果，射流动力学可分为五种情况：（1）两个颈部碰撞产生的环形凹陷收缩，导致气泡分裂成两个子气泡，并在每个子气泡内部产生单个射流气泡; (2)环形凹陷撞击颗粒，导致气泡破裂并在子气泡内产生单一射流； (3)气泡被单个颈缩分裂并产生单个射流； (4)气泡被单颈缩劈裂并产生两股射流； (5)气泡通过两个颈部的收缩而分裂，并与三个子气泡一起产生四个射流。随着气泡-颗粒距离或双颗粒半径比的增加，气泡产生的小颗粒上的最大力减小。