鉛直円管内単一気泡の形状と上昇速度に関する研究(液体工学,液体機械)
鉛直円管内単一気泡の形状と上昇速度に関する研究(液体工学,液体機械)
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垂直圆管内单个气泡的形状及上升速度研究（液体工程、液体力学）
DOI：
10.1299/kikaib.69.2002
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
明男 冨山
中科院分区：
文献类型：
--
作者：
裕 中原;明男 冨山
在静止、层流和湍流条件下，测量了单个气泡在垂直管内上升时的形状和上升速度，考察了壁面对阻力和气泡形状的影响。实验使用空气和水，内径D=13.3、15.9和24.8 mm的三根管子。每次实验中当量气泡直径d与D的比值λ在0.2~2.0之间变化。阻力系数的关联式为cd0φ>；(λ)，其中cd0是气泡在无限大静止液体中的阻力系数，乘数φ(λ)是Clift和Wallis乘数的算术平均值。气泡形状表示为液体雷诺数的函数。通过界面跟踪模拟也证实，所提出的关联式不仅适用于空气-水体系，也适用于Morton数小于10-8的低粘度体系。
Shapes and rising velocities of single bubbles rising through vertical pipes were measured under stagnant, laminar flow and turbulent flow conditions to examine the wall effects on the drag force and bubble shape. Experiments were conducted using air and water, and three pipes of inside diameter D = 13.3, 15.9 and 24.8mm. The ratio λ of equivalent bubble diameter d to D was varied from 0.2 to 2.0 in each experiment. The drag coefficient was correlated in the form of CD0φ>(λ) where CD0 is the drag coefficient of a bubble in an infinite stagnant liquid and the multiplier φ(λ) is given as the arithmetic mean of Clift's and Wallis's multipliers. Bubble shapes were expressed as a function of the liquid Reynolds number. It was also confirmed through interface tracking simulation that the proposed correlations are applicable not only to the air-water system but also to a low viscosity system, the Morton number of which is less than 10-8.