C224 傾斜上昇流中にて大気泡後流が後続気泡速度に与える効果(OS9 熱・流動(5))

Abstract

The influence of Taylor bubble wake on the trailing Taylor bubble velocity in an upward inclined flow was studied. One or two large bubbles which had certain volumes were injected into an upward inclined water flow, and the bubble velocity and the bubble separation distance were obtained by the high-speed camera images. From the obtained relationship between the trailing bubble velocity and the bubble separation distance, the maximum bubble velocity, u_<max>, the separation distance where the bubble velocity is maximal, z_<max>, the range where the bubble velocity is increased, z_w and the decay ratio of bubble velocity with the separation distance, ψ were estimated u_<max> increases with increasing φ and λ_<lead>. z_<max> and z_w increase with increasing λ_<lead> and have a peak between φ = 45-75[deg.]. ψ decreases with increasing λ_<lead> and bottomed out at a certain value. It was appeared that u_<max> is related to the liquid film velocity of the leading bubble and z_<max> and z_w are related to the liquid film Reynolds number of the leading bubble.