Hydrodynamic Lubrication


As indicated in Figure 1-3, there are two types of bearing configurations: (1) thrust bearing to support the normal load and (2) journal bearing to support the radial load. Often separate thrust and journal bearings are designed and implemented to support a rotating impeller. In certain cases more complex designs are used to combine the two bearing types. Nevertheless, the basic geometry that makes load support possible in hydrodynamic bearings is a converging wedge. In other words, the fluid is pulled into a converging gap through shear and a force perpendicular to the flow direction is produced, providing load support. Analysis of flow and prediction of load carrying ability of bearings starts with the Reynolds equation.

2.1Reynolds Equation
2.2Thrust Bearing Configurations
2.3Journal Bearings
2.4Shear Stress and Hemolysis
2.5Design and Testing of a Thrust Bearing

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