Velocity of large drops and bubbles in media of infinite or restricted extent

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Abstract
A new theory gives a simple method of calculating the terminal velocity of fluid particles moving in media of either infinite or restricted extent.Empirical and semiempirical formulas [Equations (27) and (30)] and a graph (Figure 6) over the interval 0 ≤ d/D ≤ 1.3 are shown to yield satisfactory results for gas or liquid particles moving in liquid media. In the case of liquid drops falling through gaseous media they give only a rough approximation.Graphs showing the variation of the drag coefficient (Figure 1) and the shape (Figure 2) of fluid particles with the Eötvös number are given. A semiempirical equation for the terminal velocity of solid spheres in restricted media has also been developed [Equation (24)].