The advantages of magnetic fluid seals, such as low friction moment, high tightness, and high durability, have been known for many years. However, they are used particularly in air or vacuum environments and the application of this type of seal in water still remains a problem. This is mainly due to the friction occurring between the two fluids and interfacial instability. This publication focuses on investigating the influence of magnetic fluid properties on the mechanism of pressure transfer between sealing stages. The main aim was to better understand the leak mechanism in this type of seal and to be able to select ferrofluids (FFs) resistant to water for long-term operation after short-term testing. The tested seals rotated over 4.3 million times without failure. The results of the research carried out are recommendations for the selection of magnetic fluid, sealing stage width, and FF volume.

中文翻译：

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水环境中磁流体密封泄漏机理的实验研究


磁流体密封件的优点，例如低摩擦力矩、高密封性和高耐用性，多年来已为人所知。然而，它们特别是在空气或真空环境中使用，并且这种类型的密封件在水中的应用仍然是一个问题。这主要是由于两种流体之间发生的摩擦和界面不稳定性。本出版物重点研究磁流体特性对密封级之间压力传递机制的影响。主要目的是更好地了解此类密封件的泄漏机制，并能够在短期测试后选择耐水的铁磁流体 (FF) 进行长期运行。经过测试的密封件旋转了 430 万次以上，没有出现故障。研究结果为磁流体的选择、密封级宽度和 FF 体积提供了建议。