A Study on Relationship between Swirling Flow Characteristics and Rheologic Characteristics of Surfactant Solution

摘要

The purpose of this study is to investigate the effect of rheologic characteristics of surfactant solution on the swirling flow characteristics. The drag-reducing rate in a swirling pipe flow was estimated by the pressure drop and the velocity profiles were measured by LDV. The non-Newtonian viscosity and the relaxation time were measured by a rotation viscometer. It is shown that the drag-reducing rate depends on the relaxation time strongly, compared with the rheologic parameters by a power law. The effect of apparent viscosity on the swirl intensity and the stronger effects of relaxation time on the decay of swirl intensity are shown also and discussed.