Experimental Investigation of Effects of Slip Ratio on Elastohydrodynamic Lubrication Film Related to Temperature Distribution in Oil Films
Experimental Investigation of Effects of Slip Ratio on Elastohydrodynamic Lubrication Film Related to Temperature Distribution in Oil Films
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滑移率对与油膜温度分布相关的弹流润滑膜影响的实验研究
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
T. Nakahara
中科院分区：
文献类型：
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作者：
K. Yagi;K. Kyogoku;T. Nakahara
本文阐述了高滑移率条件下弹流润滑油膜的变化机理。使用球盘装置进行实验。油膜厚度的测量采用光学干涉法。通过改进的红外技术，使用没有任何涂层的透明盘和具有相对厚的Cr涂层的不透明盘，确定球表面、盘表面和油膜中的温度增加。结果表明，在恒定卷吸速度下，油膜厚度随滑移率的增大而减小。油膜的形状表明，在入口区域处的厚度梯度增加，而在出口区域后面的油膜略有增加。入口区域的温度随着滑移率和卷吸速度的增加而增加。入口区域和接触区域都表现出表面之间的显著温差。油膜形状的变化可以用粘度楔作用来解释。粘性楔作用、入口区域的加热以及从较慢的表面到入口区域的热流入显著地减小了膜厚度。
Abstract This article describes the mechanism of variations of elastohydrodynamic lubricated oil film under high slip ratio conditions. Experiments were conducted using a ball-on-disc apparatus. The thickness of the oil film was measured by optical interferometry. Temperature increase in the ball surface, disc surface, and oil film was determined by an improved infrared technique using a transparent disc without any coating and non-transparent disc with a comparatively thick Cr coating. The results reveal that the film thickness decreases with an increase in the slip ratio at constant entrainment velocities. The shape of the oil film indicates an increase in the thickness gradient at the inlet region and a slight increase in the oil film just behind the exit region. The temperature at the inlet region increases with the slip ratio and entrainment speed. Both the inlet region and the contact area exhibit a significant temperature difference between the surfaces. The variation of the shape of the oil film can be explained on the basis of the viscosity wedge action. The viscosity wedge action, heating at the inlet region, and inflow of heat from a slower surface to the inlet region reduce the film thickness considerably.