:Part 1 : Observation of Flow Patterns and Falling Behaviors

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In this paper a slender body is used as the simplest model of a single fiber. The falling behaviors of two slender bodies in the still water have been investigated by experiments. When one slender body falls in the still water, the flow pattern produced by its motion has been observed.<BR>The obtained results are as follows : <BR>(1) When one slender body falls, a flow region is composed of a boundary layer developed along the slender body's axis and a wake behind it, and a twin of trailing vortex generates from its back end. The wake changes from twin vortex into von kãrmân's vortex street when the Reynolds number exceeds 50.<BR>(2) When two slender bodies fall side by side, the flow produced by the motion of the leading slender body influences the falling behaviors of the trailing slender body. Under certain conditions the trailing body approaches the leading one and the two collide. Thereafter the trailing body overtakes the leading one.
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