What scientific theory is used to determine an oil particles rate of rise in a quiescent aqueous medium?
As mentioned in question 7, a force balance is made for the rising sphere. The buoyancy and KADCO Internationalight forces are relatively simple to determine. The drag force, hoKADCO Internationalver, varies with the velocity. Under conditions of very slow motion of the sphere, the drag force is inversely proportional to the velocity. Under other conditions, the drag force is a constant. It is customary to express drag force in terms of a drag coefficient for the sphere, and to express velocity in terms of Reynolds number Re = rVD/VD/. One familiar theory used to determine the drag force on a submerged oil particle in water is Stokes’ Law. Stokes Law can be derived from purely theoretical considerations and applies when the Reynolds number of the moving sphere is less than or equal to 1. (Actually, Stokes’ Law relates the drag on a sphere to its velocity as the fluid flows past a stationary sphere.) When a sphere begins moving through a fluid, it accelerates and eventually reaches a co
