Study on Flow Characteristics of Dilute Polymer and Surfactant Solutions

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  • Hidema Ruri
    Department of Chemical Science and Engineering, Kobe University

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  • 高分子および界面活性剤の希薄溶液の流動挙動の研究
  • コウブンシ オヨビ カイメン カッセイザイ ノ キハク ヨウエキ ノ リュウドウ キョドウ ノ ケンキュウ

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Abstract

<p>Fluidity of complex fluids such as dilute polymer solutions and threadlike micelle solutions is highly affected by its inside structure. The complexity of the fluid is that a key factor affecting the fluidity can be different at each length scale. We have been trying to investigate effects of polymers on turbulent drag reduction. In order to extract effects of extensional rheology of polymer solutions on a turbulent flow, we use wall-free two-dimensional(2D) turbulence. 2D turbulence was visualized and analyzed by interference patterns of the flow and PIV analysis. Polymers were found from the results to induce vortex deformation, which prohibits the energy transfer in the 2D flow. The phenomena were significantly affected by a relaxation time of polymer solution. We also studied effects of mixed solution of polymers and threadlike micelles on fluidity and on a sedimentation phenomenon of latent-heat fine particles in a latent heat transportation system. At a certain concentration, the particles were highly dispersed for several days. Inner structures of the solution were measured by a dynamic laser scattering system, which indicated the combined effects of polymers and threadlike micelles.</p>

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