高速度時系列PTVによる上昇および下降気泡流中の乱流エネルギ輸送機構の解明(反応・多相系混相,一般講演)

概要

論文の詳細を見る
This paper presents an experimental investigation of upward and downward bubbly flows by using particle tracking velocimetry (PTV) and shape projection imaging (SPI) measurement systems. Experiments were performed at the Re=19000 and the air mass flow, w, is set to be three conditions. For upward flow, bubles are located near the wall and for downward flow in the middle of the pipe. Mean velocity was flattened for both flows and the turbulent kinetic energy (TKE) production reduced. However, TKE dissipation was increased in the vicinity of the wall for upward bubbly flows and at the center of the pipe for downward bubbly flows. The classical -5/3 power law is replaced by a -8/3 power law for upward flow and stays at -5/3 power law for downward flow.
2009-09-02