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On hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal

Penggao Zhang (College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China)
Boqin Gu (College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China)
Jianfeng Zhou (Nanjing Tech University, Nanjing, China)
Long Wei (Nanjing Polytechnic Institute, Nanjing, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 1 October 2018

Issue publication date: 19 November 2018

Abstract

Purpose

The purpose of this study is to investigate the hydrodynamic lubrication characteristics of ferrofluid film for spiral groove mechanical seal in external electromagnetic field and to analyze the effects of the volume fraction of ferrofluid, parameters of the electromagnetic field, operating parameters and geometrical parameters of mechanical seal on the characteristics of ferrofluid film.

Design/methodology/approach

The relationship between the ferrofluid viscosity and the intensity of external electromagnetic field was established. Based on the Muijderman narrow groove theory, the pressure distribution was calculated with the trial method by trapezoid formula.

Findings

It was found that pressure, average viscosity, average density and opening force of ferrofluid between end faces increase with the increase in intensity of current, volume fraction of ferrofluid, rotating speed, pressure differential and spiral angle; decrease with the increase in temperature; and increase at first and then decrease with the increase in the ratio of groove width to weir and the groove length. All of them reach the maximum value when the ratio of width of groove to weir is 0.7 and the ratio of groove length is 0.6. Leakage of ferrofluid increases with an increase in intensity of current, volume fraction of ferrofluid, rotating speed, pressure differential, spiral angle and ratio of groove length; decreases with an increase in temperature; and increases at first and then decreases with the increase in the ratio of groove width to weir. The tendencies of characteristics of silicone oil are consistent with those of ferrofluid, and the characteristics of silicone oil are smaller than those of ferrofluid under the same condition.

Originality/value

The volume fraction of ferrofluid, rotating speed, spiral angle, ratio of groove width to weir, groove length and temperature have a significant influence on the characteristics of ferrofluid film; however, intensity of current and the pressure differential have slight influence on the characteristics of ferrofluid film. An analytical method for analyzing hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal was proposed based on the Muijderman narrow groove theory.

Keywords

Acknowledgements

This work is supported by National Natural Science Foundation of China (51775262), Natural Science Foundation of Jiangsu Province of China (BK20161546), Natural Science Foundation for Colleges and Universities in Jiangsu Province of China (16KJA470001, 17KJB530007), the project of Jiangsu provincial Six Talent Peaks (ZBZZ-014) and the 5th “333” High-Level Talents Cultivation Project of Jiangsu Province (BRA2017482).

Citation

Zhang, P., Gu, B., Zhou, J. and Wei, L. (2018), "On hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal", Industrial Lubrication and Tribology, Vol. 70 No. 9, pp. 1783-1797. https://doi.org/10.1108/ILT-07-2017-0186

Publisher

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Emerald Publishing Limited

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