Bulge structure in a cavity swept by a viscoelastic fluid

21st Fluid Mechanics Conference

物理学;力学

Suzuki, H.^1 ; Sato, H.^1 ; Hidema, R.^2 ; Komoda, Y.^1

Department of Chemical Science and Engineering, Kobe University, Kobe, Japan^1

Organization of Advanced Science and Technology, Kobe University, Kobe, Japan^2

关键词: Bottom wall;    Cavity depth;    Cavity length;    Downstream region;    Separation bubble;    Side walls;    Vis-coelastic fluids;    Visualization experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/530/1/012055/pdf
DOI  :  10.1088/1742-6596/530/1/012055

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In order to study a bulge structure observed in a cavity swept by a viscoelastic fluid, flow visualization experiments have been performed. The cavity depth, the cavity length and the width of flow path were fixed while the water Reynolds number based on the narrow flow path was changed from 680 to 4,200. From the results, the bulge structure formed on the upstream backward-facing side wall of the cavity in the mid-range of the Reynolds number was found to lead a fresh fluid into a cavity and to sweep the fluid near the cavity bottom wall. The bulge structure fluctuates very slowly and this fluctuation induces a tonguing motion of the tip of the separation bubble formed in the downstream region of the cavity. Thus, this structure can be expected to enhance the heat transfer from the cavity bottom.