Hydrodynamic journal bearings have been widely used to support high speed rotating machinery such as turbines and compressors because of their superior durability and load carrying capacity. Therefore, the bearings are important machine elements for enhancing the quality of the rotating machinery. Assuming that oil flow in a journal bearing can be treated as parallel flow between two large isothermal plates as shown in Figure 1 with one plate moving at constant velocity of 20 m/s and the other stationary. Consider such a flow with a uniform spacing of 1.8 mm between the plates. The temperatures of upper and lower plates are 45°C and 12°C, respectively. By simplifying and solving the momentum and energy transport equations in Appendix B, Derive the velocity and temperature profile in the oil. State all your postulate and assumptions.
Hydrodynamic journal bearings have been widely used to support high speed rotating machinery such as turbines and compressors because of their superior durability and load carrying capacity. Therefore, the bearings are important machine elements for enhancing the quality of the rotating machinery.
Assuming that oil flow in a journal bearing can be treated as parallel flow between two large isothermal plates as shown in Figure 1 with one plate moving at constant velocity of 20 m/s and the other stationary. Consider such a flow with a uniform spacing of 1.8 mm between the plates. The temperatures of upper and lower plates are 45°C and 12°C, respectively. By simplifying and solving the momentum and energy transport equations in Appendix B,
Derive the velocity and temperature profile in the oil. State all your postulate
and assumptions.
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