Abstract A resonant piezoelectric micro-jet (RPMJ) using a longitudinal transducer (LT) is proposed for achieving high-speed jetting of high-viscosity liquid. The continuous droplets are realized by the pressure change of micro-jet element (MJE) which can be generated by the high frequency vibration of the LT. The RPMJ is designed and its driving principle is simulated to reveal the pressure change and the jetting status. The modal and harmonic response analyses are performed to determine the resonant frequency of the LT. The transient and two-phase coupling analyses are launched to optimize the parameters of the MJE; and the jetting performances under the various viscosities of silicone oils are analyzed. A prototype of the RPMJ is fabricated and its tested system is established. The jetting of the silicone oil with the viscosity of 150 cps is achieved under the voltage of 300 Vp-p and frequency of 19.4 kHz, and the average flowrate is about 0.07 ml/s. The maximum average flowrate can reach to 0.51 ml/s when the viscosity is 2 cps. In a word, the viscosity range of operable liquid has been broadened using the proposed RPMJ.

中文翻译：

---

使用纵向换能器开发用于高粘度液体的谐振压电微射流

摘要 为了实现高粘度液体的高速喷射，提出了一种使用纵向换能器 (LT) 的谐振压电微射流 (RPMJ)。连续液滴是通过微射流元件 (MJE) 的压力变化实现的，微射流元件可以由 LT 的高频振动产生。设计RPMJ并模拟其驱动原理，以揭示压力变化和喷射状态。执行模态和谐波响应分析以确定 LT 的谐振频率。启动瞬态和两相耦合分析以优化 MJE 的参数；并对硅油在不同粘度下的喷射性能进行了分析。制造了RPMJ的原型并建立了其测试系统。在300 Vp-p的电压和19.4 kHz的频率下实现了粘度为150 cps的硅油的喷射，平均流速约为0.07 ml/s。粘度为2cps时，最大平均流速可达0.51ml/s。总之，使用建议的 RPMJ 扩大了可操作液体的粘度范围。