Preesure changes in fliud movement

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The discussion revolves around calculating the pressure changes and lifting forces caused by fluid movement in a grooved surface that rotates over a stationary smooth surface. The user seeks clarification on whether the Bernoulli equation can be applied to this scenario, as they understand that high-speed fluid flow results in low pressure. Participants express uncertainty, with one suggesting that surface tension of the lubricant might play a role. The conversation highlights the need for expert insight to accurately address the complexities of fluid dynamics in this context. Understanding these principles is crucial for solving the user's problem effectively.
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Hope you guys can help me in solving this problem...

There one grooved surface seal the another smooth surface from bottom ...
inside the grooved surface there will be a liquid... this grooved surface will rotate at certain speed , while the smooth surface on the bottom will remain stationary.

The problem is the pressure changes result from the movement of the fluid inside the grooves will lift the grooved surface... how to calculate this pressure different and lifting force ?


p/s what i know, the high speed fluid will result the low pressure... how come there lifting force?
 
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Welcome to PF, Superb.
I'm having a bit of trouble understanding your question. Do you mean that you have a stationary seal with oiled grooves in the interior surface within which the shaft rotates?
 
yes, that's what i mean


could you help me... can i use the Bernoulli equation for this application?
 
I'm afraid that I can't help you, pal. I never finished high-school. My first thought is that it would be a surface-tension effect of the lubricant. You really have to wait for a real scientist to answer you, though.
 

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