The jet microbubble generator is often used to produce bubbles in flotation equipment, which generates microbubbles by self‐absorbing or inflating. Bubble behavior is a dominant factor in froth flotation, and its velocity, size, and distribution greatly affect flotation performance. However, the asymmetry distribution of the pressure, bubble velocity, and gas holdup in generator with single inlet probably causes eccentric wear to the equipment. Therefore, in this study, using particle image velocimetry (PIV), high‐speed dynamic camera, and computational fluid dynamics (CFD) technology, the bubble behaviors in the jet microbubble generators with single inlet and double inlet was studied. The results show that under air flux of 0.4 L/min, the change of bubble diameter (D₃₂) in two generators is obvious, reducing by 5.97% and 3.77% under circulation water flux of 1.5 and 2.5 m³/h, respectively. Comparing the influence of circulating water fluxes, the double‐inlet structure can reduce the bubble diameter more effectively. The maximum turbulent dissipation rate in the throat section of the generator with double inlet is greater than 120, while it is less than 100 in single‐inlet structure. For bubbles in generator with double inlet, velocity difference in radial direction reduces to 0.03 m/s and is more symmetrical. Meanwhile, the double‐inlet generator can also optimize the uniformity gas holdup distribution, which is beneficial to increase the collision probability of flotation and reduce the abrasion of microbubble generator.

中文翻译：

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喷射微气泡发生器中单空气入口和双空气入口之间的气泡速度，大小和滞留率分布的比较

喷射微气泡发生器通常用于在浮选设备中产生气泡，该设备通过自吸收或充气产生微气泡。气泡行为是泡沫浮选的主要因素，其速度，大小和分布会极大地影响浮选性能。但是，单入口发电机中压力，气泡速度和气体滞留量的不对称分布可能会导致设备偏心磨损。因此，在这项研究中，使用粒子图像测速（PIV），高速动态相机和计算流体动力学（CFD）技术，研究了具有单入口和双入口的射流微气泡发生器中的气泡行为。结果表明，在0.4 L / min的空气流量下，气泡直径的变化（D ₃₂）在两个发电机中很明显，在1.5和2.5 m ³ / h的循环水流量下分别降低了5.97％和3.77％。比较循环水通量的影响，双入口结构可以更有效地减小气泡直径。双入口发生器的喉部最大湍流耗散率大于120，而在单入口结构中，最大湍流耗散率小于100。对于双入口发生器中的气泡，径向速度差减小到0.03 m / s，并且更加对称。同时，双进气道发生器还可以优化均匀气含率分布，有利于增加浮选的碰撞概率，减少微气泡发生器的磨损。