|
CSME 2024/08
Volume 45 No.4
:
337-344
|
|
Coupled Effects of Porous Medium Layer and Micro-Polar Lubricants on Transient Squeeze Elastohydrodynamic Lubrication
Li-Ming Chua, Chang-Jian Cai-Wanb and Yuh-Ping Changc
aDepartment of Green Energy and Information Technology, National Taitung University, Taitung City 950309, Taiwan, ROC
bDepartment of Mechanical Engineering, National Chin-Yi University of technology, Taichung City 411030, Taiwan, R.O.C.
cDepartment of Mechanical Engineering, Kun Shan University, Tainan City 710303, Taiwan, R.O.C.
|
Abstract:
A numerical manner is expanded to calculate transient film thicknesses, pressures, and normal squeeze velocities during transient squeeze process in an isothermal elastohydrodynamic lubrication (EHL) spherical conjunction using micro-polar (MP) lubricants with porous medium layer (PML) for fixed loading. The transient modified Reynolds equation is obtained using Darcy’s law and Eringen’s micro-polar rheology according to cylinder coordinates. The coupled transient modified Reynolds, lubricant rheology, load balance, and elasticity deformation equations are solved simultaneously by means of finite difference method (FDM), successive over-relaxation method (SORM) and Gauss-Seidel iteration method (GSIM). The simulation results revealed that the influence of PML is equal to absorb lubricant, so film thickness is reduced. The influence of MP lubricant is equal to enhance lubricant viscosity, so film thickness is enlarged during transient pure squeeze process. Due to variation of film thicknesses, the pressure distributions change in different zones for fixed loading. The influences of thickness and permeability of PML as well as characteristic length and coupling parameter of MP lubricant are discussed.
|
|
Keywords: Porous medium layer, micro-polar lubricants, EHL, transient Squeeze
|
|
|
*Corresponding author; e-mail:
|
©
2024
CSME , ISSN 0257-9731
|