Zhang Yuning, Lu Xuan, Hu Jinsen, Yu Jiaxin, Zhang Yuning
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China.
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China.
Ultrason Sonochem. 2025 Jan;112:107168. doi: 10.1016/j.ultsonch.2024.107168. Epub 2024 Nov 19.
The current paper delves into the jet dynamics arising from a cavitation bubble in proximity to a dual-particle system, employing both experimental methodology and numerical simulation. The morphological development of a laser-induced bubble as well as the production of jets are captured by utilizing high-speed photography. The principles of bubble morphology evolution and jet formation are revealed by a OpenFOAM solver, which takes into account the effects of two-phase fluid compressibility, phase changes, heat transfer, and surface tension. Fluid temperature variations induced by bubble oscillations are discussed. The results indicate that the jet dynamics can be categorized into three cases, i.e. bubble-splitting double jets, impacting single jet, non-impacting double jets. For bubble-splitting double jets, bubble splitting is induced by an annular pressure gradient towards the bubble axis. This resulted in the production of two unequal-sized sub-bubbles, which subsequently produced double jets in opposite directions. The fluid temperature close to the bubble interface is low, while the bubble center is high. For impacting single jet, it is induced by a conical pressure gradient towards the nearest particle and the jet impacts the particle. The fluid temperature is low near the jet and high near the particle. When the jet penetrates the bubble interface, the temperature inside the bubble reaches its peak. For non-impacting double jets, they are induced by pressure gradients facing each other and they do not impact particles. The temperature inside the bubble increases with the proximity of the two jets.
本文采用实验方法和数值模拟，深入研究了靠近双粒子系统的空化泡产生的射流动力学。利用高速摄影捕捉激光诱导气泡的形态发展以及射流的产生。通过一个考虑了两相流体可压缩性、相变、热传递和表面张力影响的OpenFOAM求解器揭示了气泡形态演变和射流形成的原理。讨论了由气泡振荡引起的流体温度变化。结果表明，射流动力学可分为三种情况，即气泡分裂双射流、冲击单射流、非冲击双射流。对于气泡分裂双射流，气泡分裂是由朝向气泡轴线的环形压力梯度引起的。这导致产生两个大小不等的子气泡，随后在相反方向产生双射流。靠近气泡界面的流体温度低，而气泡中心温度高。对于冲击单射流，它是由朝向最近粒子的锥形压力梯度引起的，射流冲击粒子。射流附近的流体温度低，粒子附近的流体温度高。当射流穿透气泡界面时，气泡内部温度达到峰值。对于非冲击双射流，它们是由相互面对的压力梯度引起的，并且它们不冲击粒子。气泡内部的温度随着两射流的靠近而升高。
