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Guest · Posted: Tue Jul 29, 2008 11:32 pm Post subject: wiffle ball fluid flow

Without doing a serious CFD project does anyone know of a back of the
envelope calculation or model that will let me show the following.

Given:
Fluid Velocity (uniform, incompressible)
Fluid Density
Kinematic Viscosity
Diameter of a sphere (porous)
Porosity of sphere (blockage ratio)

I would like to know the fluid velocity inside the sphere at various
“latitudes” in the sphere. I would only need to know 3 to 4
graduations in say the top hemisphere (I am assuming symmetry).

If the flow is coming from left to right the part of the sphere normal
will have a higher porosity because the holes will be normal to the
current or a 90 deg angle of attack. As one gets closer to the edge
the holes will appear smaller and have less porosity because their
angle of attack is much less.

Any thoughts?

Langley


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