Calculating the Reynolds Number (Re) for a non-spherical object?

[vette982]

I have the density (ρ) of the particles, the fluid, as well as the complete dimensions of the non-spherical particles. I know the Force of drag (F) and the Coefficient of drag (C). But how do you get the Reynolds number from this? I can't use Stokes' equations because they only apply to spheres.

[redargon]

So you have non-spherical particles in a flow, or the fluid is made up of non-spherical particles or the object that the flow reacts to is non-spherical? I'm not sure I understand the question, could you rephrase it please?

[Andy Resnick]

I have the density (ρ) of the particles, the fluid, as well as the complete dimensions of the non-spherical particles. I know the Force of drag (F) and the Coefficient of drag (C). But how do you get the Reynolds number from this? I can't use Stokes' equations because they only apply to spheres.

The Reynolds number has a 'characteristic length' scale

http://en.wikipedia.org/wiki/Reynolds_number

Choice of 'L' depends on the problem. It may refer to the size of an object immersed in flow, or the size of a duct, or some other chacateristic length scale. In your case, I suspect the natural choice is an average diameter.