Contributed by the Fluids Engineering Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the Fluids Engineering Division August 24, 2000; revised manuscript received May 20, 2001. Associate Editor: L. Mondy.

Particle motions in a turbulent boundary layer are strongly related to some significant environmental problems such as desertification and air pollution, and they often occur in many industrial processes. It is, therefore, of great practical interest to investigate the particle motions both in settling the environmental problems and in designing industrial equipment.

Since lift acting on a particle is known to be affected by fluid shear and particle rotation, the effect should be taken into account in predicting the particle trajectories in a turbulent boundary layer flow. The approximate expressions for the lift on a rotating particle in a shear flow have been proposed by a number of researchers (e.g., Rubinow...

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