Inverse Transverse Migration of Small Bubbles in Turbulence
Inverse Transverse Migration of Small Bubbles in Turbulence
复制标题
湍流中小气泡的逆横向迁移
DOI：
10.7566/jpsj.82.044401
复制
发表时间：
2013
影响因子：
1.7
通讯作者：
Mitsuru Tanaka
中科院分区：
文献类型：
--
作者：
Mitsuru Tanaka
对受到水平方向均匀剪切的垂直流的均匀湍流中小气泡的运动进行直接数值模拟，以了解湍流对气泡横向迁移的影响。伪谱方法用于求解载流子的纳维-斯托克斯方程，拉格朗日方法用于跟踪气泡轨迹。压力梯度、附加质量、阻力、升力和重力被视为作用在气泡上的力。数值结果表明，湍流剪切流中气泡的平均横向迁移方向与层流剪切流中相反。研究还发现，气泡容易在纵向涡流管和涡流层旁边的低速区域积聚。这些结构中捕获的气泡从垂直方向向横向倾斜，倾向于沿着它们上升。这反转了平均横向的方向......
Direct numerical simulations are performed on the motion of small bubbles in homogeneous turbulence subject to a vertical flow that is uniformly sheared in the horizontal direction in order to understand the effect of turbulence on the transverse migration of bubbles. A pseudospectral method is used for solving Navier–Stokes equations for the carrier flow, and a Lagrangian approach is employed for tracking bubble trajectories. The pressure gradient, added mass, drag, lift, and gravitational forces are considered as forces acting on the bubbles. Numerical results show that the direction of the mean transverse migration of bubbles in a turbulent shear flow is opposite to that in the laminar shear flow. It is also found that bubbles tend to accumulate in longitudinal vortex tubes and low-speed regions beside vortex layers. Bubbles trapped in these structures, which are inclined in the transverse direction from the vertical direction, tend to rise along them. This reverses the direction of the mean transverse...
影响因子：
4.6
作者：
Aliseda, A.;Lasheras, J. C.
通讯作者：
Lasheras, J. C.