AM06-08-002 円管内気液二相乱流における圧力および速度変動の同時計測(混相流・機能性流体(1),一般講演)

概要

論文の詳細を見る
Turbulence structure in a bubbly upward pipe flow was investigated by a high-time resolution PIV/LIF system and a shadow imaging technique to detect the bubble's shape and position simultaneously. Turbulence energy was augmented at the high frequency region by both large and small bubbles, which yields an increase in its dissipation rate. While the Reynolds stress was strongly reduced in the whole region of pipe, inducing a decrease in the turbulence production. The time-series pressure-velocity correlation was evaluated by using a pressure transducer at the pipe centerline. Pressure-velocity correlation amongst large bubbles was strongly fluctuated compared to the single phase because of the bubble cluster, which contributes to the energy budget in the turbulence kinetic energy equation.
2006-09-05