With the increase of the dimensionless wall viscosity η*W, the speed change of the tightly adsorbed layer becomes smaller and smaller. The variable speed zone is mainly in the low viscosity zone of the intermediate layer. In this zone, the speed gradient is very large, and the friction characteristics of the bearing are mainly It is decided by this area. The wall viscosity increases, the greater the impact on the speed, the speed changes are concentrated in the middle layer, at this time, the middle layer presents a large speed gradient. It can be seen from the ratios under different viscosities that the increase of δ* clearly shows the nonlinearity of the liquid. The speed of the adsorption layer in the exit zone is significantly different from that in the entrance zone, and the rate of change of the speed in the exit zone is much greater than that in the entrance zone. At the same time, the velocity difference between the fluid in the adsorption layer and the solid wall surface is reduced due to the strong adsorption effect, so it can be seen that the role of the adsorption layer is similar to that of further reducing the micro gap. It can be seen that the load-carrying capacity of the film-lubricated bearing is greatly increased. However, it should also be noted that the role of the adsorption layer causes the temperature field to change, the gap is reduced, the flow rate of the lubricant is reduced, the heat taken away by the lubricant is reduced, and the temperature rise is increased, which will change the characteristics of the lubricant.
Fluid velocity analysis is a key issue of flow field analysis. The results of this study can be extended to other flow field analysis. According to the simplified calculation analysis, the following conclusions are drawn for reference: 1) This study is suitable for flow field analysis under small gaps. , Such as capillary flow, nano-interstitial flow, etc. Its characteristic is that the wall function cannot be ignored, so when the gap is small to a certain extent, it will not flow or require a large pressure difference. 2) The temperature change in the flow field analysis is related to the fluid velocity. Due to the strong adsorption of the wall, the velocity gradient changes and a large velocity gradient is formed. Therefore, this study also provides a reference for the temperature field analysis. 3) Due to the large velocity gradient, lubricant thinning must be considered. This study will provide data for thinning research.
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