Hunter G, Lucas M, Watson I, Parton R
Department of Mechanical Engineering, University of Glasgow, Glasgow, Scotland, UK.
Ultrason Sonochem. 2008 Feb;15(2):101-9. doi: 10.1016/j.ultsonch.2006.12.017. Epub 2007 Feb 6.
Tuned cylindrical radial mode ultrasonic horns offer advantages over ultrasonic probes in the design of flow-through devices for bacterial inactivation. This study presents a comparison of the effectiveness of a radial horn and probe in the inactivation of Escherichia coli K12. The radial horn is designed using finite element analysis and the predicted modal parameters are validated using experimental modal analysis. A validated finite element model of the probe is also presented. Visual studies of the cavitation fields produced by the radial horn and probe are carried out using luminol and also backlighting to demonstrate the advantages of radial horns in producing a more focused cavitation field with widely dispersed streamers. Microbiological studies show that, for the same power density, better inactivation of E. coli K12 is achieved using the radial horn and, also, the radial horn offers greater achievable power density resulting in further improvements in bacterial inactivation. The radial horn is shown to be more effective than the probe device and offers opportunities to design in-line flow-through devices for processing applications.
在用于细菌灭活的流通式装置设计中，调谐圆柱形径向模式超声变幅杆比超声探头具有优势。本研究对径向变幅杆和探头灭活大肠杆菌K12的有效性进行了比较。利用有限元分析设计径向变幅杆，并通过实验模态分析验证预测的模态参数。还给出了经过验证的探头有限元模型。使用鲁米诺并结合背光照相技术对径向变幅杆和探头产生的空化场进行了可视化研究，以证明径向变幅杆在产生更聚焦的空化场且伴有广泛分散的流光方面的优势。微生物学研究表明，在相同功率密度下，使用径向变幅杆能更好地灭活大肠杆菌K12，而且径向变幅杆可实现更高的功率密度，从而进一步提高细菌灭活效果。结果表明，径向变幅杆比探头装置更有效，为设计用于处理应用的在线流通式装置提供了机会。
