Flow Past Nonspherical Particles at Higher Reynolds Numbers

Flow Past Nonspherical Particles at Higher Reynolds Numbers 

With further increase of the Reynolds number, the wake becomes nonsteady and completely turbulent and goes to infinity. The force action of the flow on the body is closely related to the wake size and state. The limit asymptotic cases of this action are the Stokes (as Re - 0) and the Newtonian (as Re — oo) regimes of flow. We have already considered the characteristics of the Stokes flow. The Newtonian regime of a flow is characterized by the fact that the drag coefficient Cf of the body is constant. 

In axial flow past disks, which are the limit cases of axisymmetric bodies of small length, the drag coefficients are given in [94] for the entire range of Reynolds numbers calculated with respect to the radius. These formulas approximate numerical results and experimental data  

The steady-state settling rate of a particle of an arbitrary shape (for Newtonian regime of a flow at high Reynolds numbers) can be obtained by the formula [94] 

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