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05-Jul-2017 19:30

The behavior of systems involving the motion of small particles relative to fluids in which they are immersed covers a wide range of phenomena of interest to both scientists and engineers.

The fluid dynamic drag on a sphere and the terminal settling velocity of a single spherical particle in an infinite fluid are of interest in numerous fields.

The appropriate drag coefficient is proposed to replace the inertia type definition proposed by Newton.

It is found that the appropriate drag coefficient is a desirable dimensionless parameter to describe fluid flow physical behavior so that fluid flow problems can be solved in the simple and intuitive manner.

The drag coefficient and Reynolds number relation can be ascertained only by experiment.

This figure displays the classic shape of the drag curve for spheres and appears in every fluid mechanics and heat transfer text.The objective of this paper is to furnish the scientists and engineers with a simple and direct means of estimating drag past a sphere and the original physical behavior can be clearly reflected.

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