Evaluation of Turbulence Kinetic Energy Budget in Turbulent Flows by Using a Photobleaching Molecular Tagging Velocimetry
スポンサーリンク
概要
- 論文の詳細を見る
Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. Simultaneous measurement of velocity and velocity gradients with a spatial resolution smaller than the Kolmogorov scale is required to evaluate the TKE budget experimentally. We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. In this study, we improved PB-MTV in its processing speed by utilizing GPGPU(General Purpose Graphic Processing Unit) to increase sample number in measurements. We measured TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number as DNS data provided by Horiuchi, and compared the measured data with the DNS data to validate PB-MTV for evaluation of TKE budget. We also measured TKE budget in a bubbly flow in the square duct to examine effects of bubbles on TKE budget. As a result, we found that (1) PB-MTV can accurately evaluate TKE budget in turbulent flows, (2) bubbles affect the production and diffusion rates of TKE and do not affect the dissipation rate so much, and (3) the model proposed by Troshko and Hassan can reasonably estimate the production rate of the bubble-induced pseudo turbulence.
著者
関連論文
- A-16 高速流中におかれたVガッタ後流の乱流特性
- 希土類酸化物薄膜の新規な創製法の確立とそのトライボロジー特性(第1報) : アークプラズマと原子状酸素ビームを用いた新しい希土類酸化物薄膜の創製
- 希土類酸化物薄膜の新規な創製法の確立とそのトライボロジー特性(第2報) : イットリウム酸化物薄膜
- Evaluation of Turbulence Kinetic Energy Budget in Turbulent Flows by Using a Photobleaching Molecular Tagging Velocimetry