유량에 따른 Bubble-Driven Liquid Flow 의 특성에 관한 연구 = Dynamic Analysis of Bubble-Driven Liquid Flows with Varying Flow Rates

다국어 초록 (Multilingual Abstract)

An experimental study to evaluate dynamic structures of flow motion and turbulence characteristics in bubble-driven water flow in a rectangular tank with a varying flow rate of compressed air is conducted. Liquid flow fields are measured by time-resolved particle image velocimetry (PIV) with fluorescent tracer particles to eliminate diffused reflections, and by an image intensifier to acquire enhanced clean particle images. By proper orthogonal decomposition (POD) analysis, the energy distributions of spatial and temporal modes are acquired. Time-averaged velocity and turbulent kinetic energy distributions are varied with the air flow rates. With increasing Reynolds number, bubble-induced turbulent motion becomes dominant rather than the recirculating flow near the side wall. The total kinetic energy transferred to the liquid flow by the rising bubbles reveals a nonlinear relation with respect to the energy input due to the interaction between bubbles and free surface. Detailed spatial structures and the unsteady behavior of dominant dynamic modes associated with turbulent kinetic energy distributions are addressed.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험장치 및 방법
• 3. 결과 및 고찰
• 4. 결론
• 후기
• 참고문헌