Simulation of the effects of non-Newtonian fluid on the behavior of a step hydraulic rod seal based on a power law fluid model

The rheological characteristics of the oil film on the rod-seal interface in the sealing zone have a major influence on the behavior of reciprocating seals. Because of the addition of polymers, the viscosity and temperature properties of hydraulic oil have improved and the fluid presents non-Newtoni...

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Bibliographic Details
Published in:Journal of Zhejiang University. A. Science 2018-11, Vol.19 (11), p.824-842
Main Authors: Wang, Bing-qing, Peng, Xu-dong, Meng, Xiang-kai
Format: Article
Language:English
Subjects:
Addition polymerization
Cavitation
Civil Engineering
Classical and Continuum Physics
Computer simulation
Elastohydrodynamic lubrication
Engineering
Industrial Chemistry/Chemical Engineering
Lubrication
Mathematical models
Mechanical Engineering
Newtonian fluids
Non Newtonian fluids
Performance indices
Polymers
Power law
Pressure distribution
Reynolds equation
Rheological properties
Sealing
Stress concentration
Viscosity
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Summary:The rheological characteristics of the oil film on the rod-seal interface in the sealing zone have a major influence on the behavior of reciprocating seals. Because of the addition of polymers, the viscosity and temperature properties of hydraulic oil have improved and the fluid presents non-Newtonian characteristics. To investigate the influence of these characteristics on seal behavior, a soft elastohydrodynamic lubrication (EHL) numerical model is introduced to simulate a step seal under a mixed lubrication condition. A modified Reynolds equation is derived for calculating the fluid film pressure distribution more accurately. The equation is based on the power law fluid model and Jakobsson-Floberg-Olsson (JFO) cavitation theory. Results are presented to gain insight into the effect of non-Newtonian fluid characteristics on seal behavior, and the simulated results are compared to those of a Newtonian fluid to reveal the seal mechanism. The influence of operating parameters and the seal surface root mean square (RMS) roughness on sealing performance under different power law indexes is also investigated and discussed.
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1800096