The numbers along the line indicate several flow regimes and associated changes in the drag coefficient: drag coefficient and which is relatively simple in form. The dimensionless drag force is expressed in the form of a conventionally defined drag coefficient rather than as the dimensionless drag force FD; see further in the text.

Equation (12) gives the drag coefficient for creeping flow around a smooth sphere, and was derived theoretically. Experimental points are from several sources,

9 6 E 0.411 @ Re 2.63 H10 9 A. For values of Re greater than about 0.1, charts are available that plot the drag coefficient as a function of the Reynolds number. For Re less the drag coefficient as a function of the Reynolds number and geometric ratio for spheres , cylinders and flat plates at Reynolds numbers ranging from 0 . Figure 2-2.

Drag on Spheres Prepared by Professor J. M. Cimbala, Penn State University Latest revision: 11 January 2012 Nomenclature a speed of sound A projected frontal area (for a sphere, A = d2/4) CD drag coefficient: CD = 2FD/( V 2A) CL lift coefficient: CL = 2FL/( V 2A) d diameter of a cylinder, sphere, or other object FD drag force FL lift force g gravitational constant (9.81 m/s2) One such chart is reproduced on the next page. Stevenpuglisi's interactive graph and data of "Drag Coefficient vs Reynolds Number" is a line chart, showing Smooth Cylinder vs Test1; with Reynolds Number (Re) in the x-axis and Drag Coefficient … 1 @ Re 2.63 H10 9 A. E 0.25 @ Re 10 : A 1 Re 10 : A (1) where CD is the drag coefficient, and Re is the Reynolds number.

English: Drag coefficient C d for a sphere as a function of Reynolds number Re, as obtained from laboratory experiments.The dark line is for a sphere with a smooth surface, while the lighter-colored line is for the case of a rough surface. The equation is given below (Morrison, 2013): Sphere drag: % ½ L 24 Re E 2.6 @ Re 5.0 A 1 @ Re 5.0 A. The drag coefficients were determined by measuring the force of re­ sistanco and calculating the drag coefficient by the use of 'Equation (1) . 01 to 10. Plot of dimensionless drag force vs. Reynolds number for flow of a viscous fluid past a sphere.