Flow Around Sphere: Cavitation Condition

  • Thread starter Thread starter secret2
  • Start date Start date
  • Tags Tags
    Flow Sphere
AI Thread Summary
Cavitation occurs when the pressure at any point around a sphere moving through an incompressible fluid drops below the fluid's vapor pressure. This phenomenon is influenced by various factors, including viscosity, density, and pressure differentials. Flow separation behind the sphere can create an adverse pressure gradient, contributing to the conditions necessary for cavitation. A simplified understanding suggests that sufficient flow separation is crucial for this process. Overall, the interaction of these variables determines the likelihood of cavitation occurring.
secret2
Messages
37
Reaction score
0
For a sphere moving through an incompressible fluid, what is the condition for cavitation to occur?
 
Physics news on Phys.org
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.
 
Thread 'Gauss' law seems to imply instantaneous electric field propagation'

Thread 'Gauss' law seems to imply instantaneous electric field propagation'

Imagine a charged sphere at the origin connected through an open switch to a vertical grounded wire. We wish to find an expression for the horizontal component of the electric field at a distance ##\mathbf{r}## from the sphere as it discharges. By using the Lorenz gauge condition: $$\nabla \cdot \mathbf{A} + \frac{1}{c^2}\frac{\partial \phi}{\partial t}=0\tag{1}$$ we find the following retarded solutions to the Maxwell equations If we assume that...
View full post »

Thread 'Do electron density waves accompany EM waves in coaxial cables?'

Maxwell’s equations imply the following wave equation for the electric field $$\nabla^2\mathbf{E}-\frac{1}{c^2}\frac{\partial^2\mathbf{E}}{\partial t^2} = \frac{1}{\varepsilon_0}\nabla\rho+\mu_0\frac{\partial\mathbf J}{\partial t}.\tag{1}$$ I wonder if eqn.##(1)## can be split into the following transverse part $$\nabla^2\mathbf{E}_T-\frac{1}{c^2}\frac{\partial^2\mathbf{E}_T}{\partial t^2} = \mu_0\frac{\partial\mathbf{J}_T}{\partial t}\tag{2}$$ and longitudinal part...
View full post »
Thread 'Recovering Hamilton's Equations from Poisson brackets'

Thread 'Recovering Hamilton's Equations from Poisson brackets'

The issue : Let me start by copying and pasting the relevant passage from the text, thanks to modern day methods of computing. The trouble is, in equation (4.79), it completely ignores the partial derivative of ##q_i## with respect to time, i.e. it puts ##\partial q_i/\partial t=0##. But ##q_i## is a dynamical variable of ##t##, or ##q_i(t)##. In the derivation of Hamilton's equations from the Hamiltonian, viz. ##H = p_i \dot q_i-L##, nowhere did we assume that ##\partial q_i/\partial...
View full post »

Similar threads

I Force applied on sphere by turbulent flow
Replies
28
Views
2K
I Static sphere with gravitating fluid
Replies
6
Views
1K
I How does friction in a pipe occur, with the "no slip condition" ?
Replies
25
Views
2K
Biology Equations governing cavitation, flow speed, and delta vapor pressure...
Replies
22
Views
3K
Doublet flow in Fluid Dynamics between two spheres or cylinders
Replies
0
Views
1K
B Can charges move without a field? How charges redistribute without it?
Replies
16
Views
1K
A Why are the Navier-Stokes equations inconsistent in this case?
Replies
18
Views
2K
Does Cavitation Affect Volumetric Flow Rate Conservation in a Pipe?
Replies
1
Views
1K
I How does a free surface flow cause non-linearity?
Replies
4
Views
1K
B Temperature-Dependence of Viscosity of a Fluid?
Replies
1
Views
942

Hot Threads

Recent Insights

Back
Top