A novel membrane resonant droplet ejector (MRDE) for viscous industrial liquids is proposed in the paper. In MRDE, a vibrating nozzle is built to generate micro-droplets and the nozzle clogging could be reduced. The droplet jetting mechanism is studied by a three-dimensional (3D) lattice Boltzmann (LB) model. The effects of voltage amplitude and driving frequency on droplet volume and velocity are explored. Experimental Results show that low-viscosity water and viscous glycol could be jetted stably in parameters of 30 V/16 kHz and 60 V/20 kHz, respectively. Moreover, the droplet jetting of MRDE and in-situ observation is set up to analysis the droplet jetting characteristics. The critical thresholds for MRDE are$9.340\le Re\le 17.65$, $3.653\le \sqrt{We}\le 8.846$ and $0.014\le oh\le 0.411$, which has a wider printable range than traditional piezoelectric printheads. With the compact structure, MRDE is easy of integration for mass industrial applications compared with the pneumatic and needle-based ejectors.

本文提出了一种用于粘性工业液体的新型膜共振液滴喷射器（MRDE）。在 MRDE 中，构建了一个振动喷嘴以产生微滴，并且可以减少喷嘴堵塞。通过三维 (3D) 晶格玻尔兹曼 (LB) 模型研究液滴喷射机制。探讨了电压幅度和驱动频率对液滴体积和速度的影响。实验结果表明，低粘度水和粘性乙二醇分别在30 V/16 kHz和60 V/20 kHz的参数下可以稳定喷射。此外，还设置了MRDE液滴喷射和原位观察，分析了液滴喷射特性。MRDE 的临界阈值是$9.340\le Re\le 17.65$,$3.653\le \sqrt{We}\le 8.846$和$0.014\le ○H\le 0.411$，比传统压电打印头的打印范围更广。与气动和针式喷射器相比，MRDE 结构紧凑，易于集成用于大规模工业应用。