Abstract
A theoretical approach for estimation of the drag correlation coefficients in the flow of Newtonian or weak non-Newtonian liquids around spherical solid particles is presented. Some new analytical relations are derived by using a stream function and the energy dissipation equation to approximate the drag coefficients to the experimental data. It is shown that these relationships can be applicable in a wide range of Reynolds number, Re, up to Re<1000 for the liquids with a flow behavior index, n, in the range of 0.5< n<1. The predicted coefficients from these relationships are in very good agreement with the experimental data given in the literature.
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