Flow Around Sphere: Cavitation Condition

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Discussion Overview

The discussion revolves around the conditions necessary for cavitation to occur when a sphere moves through an incompressible fluid. It explores various factors influencing this phenomenon, including fluid properties and flow dynamics.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant asks about the specific condition for cavitation to occur around a moving sphere.
  • Another participant suggests that the situation is complex, involving multiple variables such as viscosity, density, and pressure differences, and recommends further research.
  • A third participant inquires about a simplified answer, indicating the question's intended brevity.
  • One participant asserts that cavitation occurs when the pressure at any point drops below the fluid's vapor pressure, noting that this can happen due to flow separation and an adverse pressure gradient behind the sphere.

Areas of Agreement / Disagreement

Participants express varying levels of complexity regarding the conditions for cavitation, with no consensus reached on a singular answer or approach.

Contextual Notes

The discussion highlights the dependence on various fluid properties and flow characteristics, which may not be fully defined or agreed upon by participants.

secret2
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For a sphere moving through an incompressible fluid, what is the condition for cavitation to occur?
 
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Well--this is a bit more complex than it may seem--you are dealing with a lot of different variables ---like viscosity/density/delta pressure/------perhaps a google search under "Sphere+cavitation" would help. Try that--and I will look also.

Photongod
 
Maybe there is some sort of simplified answer for it? The question is suppoesed to be a relatively short one...
 
Cavitation will happen when the pressure at any point drops below the fliud's vapor pressure. This can happen around a sphere if there is sufficient enough flow separation happens behind the sphere, creating an adverse pressure gradient.
 

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