A theoretical study is made of the force on a spherical particle which is slowly translating in a viscous fluid bounded by two perpendicular walls. Results are obtained up to the first-order effects of boundaries on the basis of the Stokes equation. When the sphere translates parallel to one wall, it experiences besides a drag force a lift force which is positive or negative, according as it approaches to or recedes from the other wall.
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Sano et al. (1976) studied this question.