v/lv, is treated as a single independent variable. The graph is the same whether v varies alone or I alone or v alone, or if two or three vary together. If N2 varies as (lv/v)n} it varies as ln, vn, v~n. The effect, for instance, of varying I can be learned by varying v or v in the model test, and… … Reynolds Number, Vdl» FIQ. i— Drag coefficients Cd^DIpVW, Cd'=DIiiV<1, plotted against Vdfr for a sphere in uniform translation through a viscous fiuid. Data given in N\ A. C. A. Report No. 253. Either graph can he plotted from the other, since Cs>'iCD=Vd{v motion (/?), and l/c for (7). No doubt…
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