FORCES ON A SPHERE ACCELERATING IN A VISCOUS FLUID.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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A study of the determination of the forces exerted by a fluid due to the relative velocity and acceleration of a sphere is presented, and previous work on rectilinear motion of bodies in a still fluid and the rectilinear motion of a fluid past fixed objects is reviewed. Experimental procedure, equipment, and tests are described. A formula is given for determining the resisting forces acting on a sphere moving rectilinearly in a viscous fluid, in terms of sphere radius, fluid density and viscosity, object velocity in the fluid, object acceleration, and force coefficients. The latter were determined experimentally by measuring the forces on a sphere moving sinusoidally within the range of 0 Re Reynolds number 62. Author