槽道湍流内气泡瞬态受力数值研究
发布时间：2018-11-25 09:32
【摘要】：为了深入理解气泡在湍流场内的运动机制,使用欧拉-拉格朗日单向耦合数值方法,详细分析了气泡在低雷诺数槽道湍流场内的瞬态受力情况;其中液相湍流速度场采用直接数值模拟方法求解,气泡的瞬态受力由牛顿运动方程计算;计算时,考虑了相间阻力、剪切升力、压力梯度力、虚拟质量力、重力对气泡运动的影响。目前的计算结果表明:气泡所受的瞬态作用力分量同时取决于重力作用方向、液相流向以及气泡所处的法向位置;不同方向上、不同位置处影响气泡运动的主要作用力分量是不同的;相比较而言,与重力方向垂直的剪切升力分量在近壁面区域为影响气泡运动的主要作用力,压力梯度力的法向分量在近壁面区域之外为影响气泡运动的主要作用力,相间阻力分量在整个槽道区域内均为影响气泡运动的主要作用力,除了竖直槽道近壁面处之外、虚拟质量力也均为影响气泡运动的主要作用力。
[Abstract]:In order to understand the motion mechanism of bubble in turbulent field, the transient force of bubble in low Reynolds number channel is analyzed in detail by using Euler-Lagrangian unidirectional coupling numerical method. The velocity field of liquid phase turbulence is solved by direct numerical simulation, and the transient force of bubble is calculated by Newtonian equation of motion. The effects of interphase resistance shear lift pressure gradient force virtual mass force and gravity on bubble motion are considered. The current calculation results show that the transient force component of the bubble depends on the direction of gravity, the flow direction of the liquid phase and the normal position of the bubble at the same time. In different directions and at different positions, the main force components affecting bubble motion are different. In contrast, the shear lift component perpendicular to the gravity direction is the main force affecting the bubble motion in the near wall region, and the normal component of the pressure gradient force is the main force that affects the bubble motion outside the near wall region. The interphase drag component is the main force that affects the bubble motion in the whole channel region, except for the vertical channel near the wall, the virtual mass force is also the main force that affects the bubble motion.
【作者单位】： 常州大学机械工程学院;
【基金】：国家自然科学基金(51376026) 江苏省大学生创新创业训练计划重点项目(201510292016Z)
【分类号】：O357.5
本文编号：2355626
[Abstract]:In order to understand the motion mechanism of bubble in turbulent field, the transient force of bubble in low Reynolds number channel is analyzed in detail by using Euler-Lagrangian unidirectional coupling numerical method. The velocity field of liquid phase turbulence is solved by direct numerical simulation, and the transient force of bubble is calculated by Newtonian equation of motion. The effects of interphase resistance shear lift pressure gradient force virtual mass force and gravity on bubble motion are considered. The current calculation results show that the transient force component of the bubble depends on the direction of gravity, the flow direction of the liquid phase and the normal position of the bubble at the same time. In different directions and at different positions, the main force components affecting bubble motion are different. In contrast, the shear lift component perpendicular to the gravity direction is the main force affecting the bubble motion in the near wall region, and the normal component of the pressure gradient force is the main force that affects the bubble motion outside the near wall region. The interphase drag component is the main force that affects the bubble motion in the whole channel region, except for the vertical channel near the wall, the virtual mass force is also the main force that affects the bubble motion.
【作者单位】： 常州大学机械工程学院;
【基金】：国家自然科学基金(51376026) 江苏省大学生创新创业训练计划重点项目(201510292016Z)
【分类号】：O357.5
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