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ISSN オンライン: 2642-0554

CONTROL OF DRAG REDUCTION OF FUNCTIONAL FLUID FLOW IN RECTANGULAR CHANNEL - SPATIAL STRUCTURE AND RECOVERY PROCESS OF TURBULENCE INVESTIGATED BY PIV -

Yasuo Kawaguchi
Turbomachinery Research Group, Institute for Energy Utilization, National Institute of Advanced Industrial Science and Technology, 1-2 Namiki, Tsukuba, Ibaraki 305-8564, Japan

Ziping Feng
Department of Nuclear Engineering Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan

Pei-Wen Li
Department of Mechanical Engineering, Kyoto University Kyoto 606-8501, Japan

要約

The turbulent frictional drag of water can be reduced dramatically by adding small amounts of drag-reducing materials, such as polymers or surfactants. As a percentage drag reduction of 80% can easily be achieved, this technique is thought to be the most practical method of reducing turbulent frictional drag.
In this work, a double pulse PIV system was used to clarify the spatial velocity distribution of surfactant solution flow in a two-dimensional channel. A type of cationic surfactant CTAC (C16H33H(CH3)3Cl) mixed with the same weight of counter-ion material NaSal (HOC6H4COONa) was used as a drag-reducing additive to water at a mass concentration of 40 ppm. Instantaneous velocity distribution taken by PIV was examined to clarify the effect of surfactant additives as well as recovery behavior of drag-reducing flow in a narrowed channel.