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CSME 2022/02
Volume 43 No.1
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29-35
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The Effects of Externally Magnetic Fields and Electrically Conducting Lubricants at Transient Squeeze MEHL Motion with Elastic Coating
Li-Ming Chua, Yuh-Ping Changb and Chang-Jian Cai-Wanc
aInterdisciplinary Program of Green and Information Technology, National Taitung University, Taitung City, Taiwan 95092, ROC.
bDepartment of Mechanical Engineering, Kun Shan University, Tainan City, Taiwan 71070, ROC.
cDepartment of Mechanical and Automation Engineering, I-Shou University, Kaohsiung City, Taiwan 84001, ROC.
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Abstract:
The pure squeeze magneto-elastohydrodynamiclubrication (MEHL) motion of point contacts with an electrically conducting fluid in transverse magnetic field on elastic coating is explored under constant load process. The modified Reynolds, the rheology, the force balance, and the elastic deformation equationsmust be solved simultaneously to obtain the transient pressure profiles, film shapes, elastic deformation, and normal squeeze velocities. The differences between classical EHL and MEHL are discussed during the pure squeeze process. The simulation results reveal that the effect of externally applied magnetic field is equivalent to enhancing the effective lubricant viscosity. Therefore, as the Hartmann number (M)increases, the effect becomes more obvious. The larger the Hartmann number, the thicker the central film thickness and minimum film thickness, the smaller the maximum central pressure, the later the maximum central pressure and the dimple are formed, the smaller the central normal squeeze velocity. The central pressure decreases with increasing M at the initial stage. The central pressure increases with increasingM at the deformation stage.
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Keywords: MEHL, external magnetic field, squeeze, elastic coating, electrical conducting
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©
2022
CSME , ISSN 0257-9731
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