Vortex Deformation on Two-dimensional Turbulence Affected by Polymers (INVITED)

Abstract eng:
A drag reduction effect has been a long-standing issue. In order to consider the background mechanism of the drag reduction effect, we focus on vortex deformation in turbulence and extensional rheological properties of the fluids in this study. A flowing soap film as a two-dimensional flow was adopted to avoid shear stress effects. Vortex generation in a 2D flow was visualized and how the vortices deformed by polymer additives were analysed. Power spectra of the visualized 2D turbulence through interference patterns and velocity fluctuation obtained by a PIV analysis revealed the variation of energy transfer in 2D flow. A wavelet analysis was used to detect the variation of vortices in time. We considered how these variations were affected by a relaxation time of sample solution, and by several extensional rates added on the flow.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket