液相の粘性が鉛直管内単一大気泡周囲の平均速度場に及ぼす影響(流体工学,流体機械)

概要

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The effect of viscosity of the liquid phase on the averaged liquid velocity field in front of, around and behind the large bubble rising in stagnant liquid in a circular pipe of inner diameter D=40.0 mm is measured. Ultrasonic Velocity Profile monitor (UVP) is used to measure the velocity field. The instrumentation and measurement method are similar to those the authors have presented in the previous paper. Five kinds of silicone oil whose kinetic viscosities cover 102〜8 946 mm^2/s and water are used as the liquid phase. In the, liquid phase in front of the large bubble, the magnitude of small upward velocities decreases with increasing the kinetic viscosity. In the liquid film around the large bubble, the downward acceleration is small when compared with water. The maximum downward velocity in the film soon becomes a constant value of bubble rising velocity approximately if the kinetic viscosities are larger than 330 mm^2/s. In the wake behind the bubble tail, a large ring vortex, which appeared when water is used, is not recognized for the silicone oil.
一般社団法人日本機械学会の論文
2008-04-25