| 张伟宾,陈律名,杜强,张琳伟,张玮,陈冰冰.超声强化受限撞击流反应器中制备纳米氧化锆的研究[J].高技术通讯(中文),2025,35(6):651~661 |
| 超声强化受限撞击流反应器中制备纳米氧化锆的研究 |
| Investigation on the preparation of nanosized zirconia in an ultrasonic-enhanced confined impinging jet reactor |
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| DOI：10. 3772 / j. issn. 1002-0470. 2025. 06. 009 |
| 中文关键词: 超声； 受限撞击流反应器； 氧化锆； 粒度分布； 数值模拟 |
| 英文关键词: ultrasound, confined impinging jet reactor, zirconium oxide, particle size distribution, numerical simulation |
| 基金项目: |
| 作者 | 单位 | | 张伟宾 | (浙江工业大学机械工程学院杭州 310023) | | 陈律名 | (浙江工业大学机械工程学院杭州 310023) | | 杜强 | (浙江工业大学机械工程学院杭州 310023) | | 张琳伟 | (浙江工业大学机械工程学院杭州 310023) | | 张玮 | (浙江工业大学机械工程学院杭州 310023) | | 陈冰冰 | (浙江工业大学机械工程学院杭州 310023) |
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| 中文摘要: |
| 通过施加超声强化受限撞击流反应器内共沉淀反应和结晶过程，优化氧化锆纳米颗粒制备过程。采用实验和数值模拟方法研究了超声空化效应和流体动力学因素对氧化锆纳米颗粒反应沉淀过程的协同作用，以及对所制备颗粒性能的影响。利用扫描电镜(scanning electron microscope，SEM)、X-射线衍射(X-ray diffraction，XRD)对有、无超声作用下制备颗粒的形貌、结构和粒度分布进行表征。结果表明，施加超声后，撞击流反应器撞击区域上方“三角区域”与出口侧方流动不佳区域的流动混合性能得到加强，能有效防止流体回流；且反应器内湍流耗散率与化学反应速率均有明显提升，反应器流动混合性能得到加强。相较于无超声条件下，超声强化后撞击流反应器制备的氧化锆颗粒为微球形，且颗粒尺寸更小、尺寸分布更窄，氧化锆更趋向于以四方相结构出现。当超声功率超过210W后，所制备的氧化锆超细粉体为高纯度四方氧化锆。 |
| 英文摘要: |
| Ultrasound is employed to enhance the coprecipitation reaction and crystallization process in a confined impinging jet reactor to optimize the synthesis of zirconia nanoparticles. The synergistic effect of ultrasonic cavitation effect and hydrodynamic factors on the reactive precipitation process of zirconia nanoparticles and their effects on the properties of the prepared particles are studied by experiments and numerical simulation. Scanning electron microscope (SEM) and X-ray diffraction (XRD) are used to characterize the morphology, structure and particle size distribution of the particles prepared with or without ultrasound. The results show that the convection of the fluid flow in the triangle region just above the impinging centre and at the outlet is significantly enhanced by the ultrasound. The flowback behaviour is effectively suppressed, the turbulent dissipation rate and chemical reaction rate in the reactor are greatly increased, and the flow mixing performance of the reactor is enhanced. Compared with nanopartilces synthesized without ultrasound, smaller micro-spherical zirconia nanoparticles with smaller particle size and narrower size distribution are obtained with application of ultrasound. Zirconia tends to appear in tetragonal phase structure. When the ultrasonic power exceeds 210W, the prepared ultrafine zirconia powder is tetragonal zirconia with high purity. |
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