垂直管内上昇気液二相流の流動特性に及ぼす壁面濡れ性の影響(流体工学,流体機械)

概要

論文の詳細を見る
To evaluate the effect of pipe wall surface wettability on flow characteristics in a vertical upward gas-liquid two-phase flow, a visualization study was performed using three test pipes: an acrylic pipe, a hydrophilic pipe and a hydrophobic pipe. Such basic flow characteristics as flow patterns, pressure drop and void fraction were investigated in these three pipes. In the hydrophilic pipe, the slug flow to churn flow transition boundary was shifted to a higher gas velocity at a given liquid velocity, whereas the churn flow to annular flow transition boundary was shifted to a lower gas velocity at a given liquid velocity. In the hydrophobic pipe, an inverted churn flow regime was observed in the region where the churn flow regime was observed in the acrylic pipe, while a droplet flow regime was observed in the region where an annular flow regime was observed in the acrylic pipe. At a high gas flow rate, the mean void fraction in the hydrophobic pipe was higher than in the acrylic pipe. The effect of surface wettability on frictional pressure loss was confirmed to be insignificant under the present experimental conditions.
社団法人日本機械学会の論文
2007-07-25