Hydrodynamic cavitation (HC) has emerged as a promising technology for water disinfection. Interestingly, when subjected to specific cavitation pressures, jet pump cavitation reactors (JPCRs) exhibit effective water treatment capabilities. This study investigated the cavitation flow and vorticty transport in a JPCR with various area ratios by utilizing computational fluid dynamics. The results reveal that cavitation is more likely to occur within the JPCR as the area ratio becomes smaller. While as the area ratio decreases, the limit flow ratio also decreases, leading to a reduced operational range for the JPCR. During the cavitation inception stage, only a few bubbles with limited travel distances are generated at the throat inlet. A stable cavitation layer developed between the throat and downstream wall during the limited cavitation stage. In this phase, the primary flow carried the bubbles towards the outlet. In addition, it was found that the vortex stretching, compression expansion, and baroclinic torque terms primarily influence the vorticity transport equation in this context. This work may provide a reference value to the design of JPCRs for water treatment.

中文翻译：

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变面积比喷射泵空化反应器空化流与涡量输运研究


水力空化（HC）已成为一项有前途的水消毒技术。有趣的是，当承受特定的空化压力时，喷射泵空化反应器 (JPCR) 表现出有效的水处理能力。本研究利用计算流体动力学研究了具有不同面积比的 JPCR 中的空化流和涡流传递。结果表明，随着面积比变小，JPCR 内更容易发生空化。而随着面积比的减小，极限流量比也会减小，导致 JPCR 的工作范围减小。在空化起始阶段，喉部入口处仅产生少量行进距离有限的气泡。在有限空化阶段，喉部和下游壁之间形成稳定的空化层。在此阶段，主流将气泡带向出口。此外，还发现涡旋拉伸、压缩膨胀和斜压扭矩项主要影响本文中的涡量传递方程。该工作可为水处理JPCR的设计提供参考价值。