Elastohydrodynamic lubrication of circular contacts at pure squeeze motion with non-Newtonian lubricants

Hsiao Ming Chu, Wang-Long Li, Ming Da Chen

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In this study a numerical method for general applications with non-Newtonian fluids is developed to investigate the pure squeeze motion in an isothermal elastohydrodynamic lubricated spherical conjunction under constant load conditions. The coupled transient modified Reynolds, the elasticity deformation, and the load equilibrium equations are solved simultaneously. Computer simulation is carried out to investigate the effects of flow rheology and operations on the relationship between the pressure and film thickness distributions. The simulation results reveal that the larger the flow index (n), the larger the film thickness and the smaller the maximum central pressure. This results in larger time needed to obtain maximum central pressure. In addition, the elastic deformation is more significant for the lower flow index. Therefore, the smaller the flow index becomes, the greater the difference between the hydrodynamic lubrication (HL) solution and elastohydrodynamic lubrication (EHL) solution becomes.

Original languageEnglish
Pages (from-to)897-905
Number of pages9
JournalTribology International
Volume39
Issue number9
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

elastohydrodynamics
Elastohydrodynamic lubrication
lubricants
lubrication
Lubricants
Film thickness
Elastohydrodynamics
film thickness
Elastic deformation
Rheology
conjunction
equilibrium equations
Lubrication
Elasticity
Loads (forces)
elastic deformation
Numerical methods
Hydrodynamics
rheology
Fluids

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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abstract = "In this study a numerical method for general applications with non-Newtonian fluids is developed to investigate the pure squeeze motion in an isothermal elastohydrodynamic lubricated spherical conjunction under constant load conditions. The coupled transient modified Reynolds, the elasticity deformation, and the load equilibrium equations are solved simultaneously. Computer simulation is carried out to investigate the effects of flow rheology and operations on the relationship between the pressure and film thickness distributions. The simulation results reveal that the larger the flow index (n), the larger the film thickness and the smaller the maximum central pressure. This results in larger time needed to obtain maximum central pressure. In addition, the elastic deformation is more significant for the lower flow index. Therefore, the smaller the flow index becomes, the greater the difference between the hydrodynamic lubrication (HL) solution and elastohydrodynamic lubrication (EHL) solution becomes.",
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Elastohydrodynamic lubrication of circular contacts at pure squeeze motion with non-Newtonian lubricants. / Chu, Hsiao Ming; Li, Wang-Long; Chen, Ming Da.

In: Tribology International, Vol. 39, No. 9, 01.09.2006, p. 897-905.

Research output: Contribution to journalArticle

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AB - In this study a numerical method for general applications with non-Newtonian fluids is developed to investigate the pure squeeze motion in an isothermal elastohydrodynamic lubricated spherical conjunction under constant load conditions. The coupled transient modified Reynolds, the elasticity deformation, and the load equilibrium equations are solved simultaneously. Computer simulation is carried out to investigate the effects of flow rheology and operations on the relationship between the pressure and film thickness distributions. The simulation results reveal that the larger the flow index (n), the larger the film thickness and the smaller the maximum central pressure. This results in larger time needed to obtain maximum central pressure. In addition, the elastic deformation is more significant for the lower flow index. Therefore, the smaller the flow index becomes, the greater the difference between the hydrodynamic lubrication (HL) solution and elastohydrodynamic lubrication (EHL) solution becomes.

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