Abstract
Developing flows of water and dilute aqueous solutions of polyethylene oxide in an inlet region of a curved pipe have been investigated by measuring velocity distributions in the Dean number range of 150 to 1200. The flows are visualized with small nylon particles having specific gravity of 1.02 and mean diameter of about 150μm. The particles are lighted by a stroboscope and photographed consecutively. Axial and secondary flow velocity distributions in the developing flow region are obtained from the picture of the particles. In addition, pictures of secondary flows in a cross section of curved pipes are taken in that region. It has been found as a result of the measurements that the flows of dilute solutions develop with the same process as water flow in laminar flow regions, but in the turbulent flow region the developing process of dilute solutions differs from that of water flow. Furthermore, the variation of boundary layer thickness and inlet length have been derived from velocity profiles.
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