In the context of fluid dynamics and journal bearings, the cavitation angle refers to the angular position at which cavitation bubbles form within the lubricating fluid. It's an important parameter that can affect the performance and stability of the bearing system. The cavitation angle is typically defined between 0 and 2π radians (0 to 360 degrees), representing a full circle.

In journal bearings, the cavitation angle is often influenced by factors like eccentricity ratio, operating conditions, and fluid properties. When you mention an eccentricity ratio of 0.5 and a cavitation angle of 140 degrees, it indicates that the cavitation angle should be larger (180 degrees or more) for a typical setup with eccentricity ratio 0.5. The fact that you're observing a smaller angle (140 degrees) suggests there might be an issue with your calculations or assumptions.

To calculate the cavitation angle in a finite journal bearing using Reynolds boundary conditions, you generally need to perform numerical simulations or calculations. Here's a general outline of the steps you might follow:

If you're getting unexpected results like a cavitation angle of 140 degrees when it should be larger, consider checking your input parameters, boundary conditions, and numerical methods. Double-check your calculations and equations to ensure there are no errors or misunderstandings in your setup. It's also possible that there could be specific factors in your bearing geometry or operating conditions that are causing this discrepancy.

If you're having trouble finding the source of the issue, it might be helpful to consult with colleagues, mentors, or experts in the field who can provide insights or guidance on troubleshooting your calculations.

Thank you for your reply sir.