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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Numerical simulation of two-phase turbulent Taylor-Couette flow with finite-size drops/bubbles
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Numerical simulation of two-phase turbulent Taylor-Couette flow with finite-size drops/bubbles

机译：APS-流体动力学APS分部第70届年会-事件-具有有限大小的液滴/气泡的两相湍流泰勒-库埃特流动的数值模拟

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Deformable bubbles/drops larger than the Kolmogorov scale (finite-size) dispersed in a turbulent flow can alter the global and local flow properties in several ways. They can enhance or reduce the net momentum/heat transport, alter the path of drops/bubbles or even the rheological properties of the fluid mixture. A detailed understanding of these systems is still missing therefore we use direct numerical simulations to study a two-phase turbulent Taylor-Couette (TC) flow to gain further insight into this problem.We solve the Navier-Stokes equations for the carrier fluid and an immersed boundary method for the dispersed phase $(10^3 drops)$. The deformation of the dispersed drops is obtained by a multi-physics interaction potential approach tuned for deformation dynamics of any liquid-liquid interface with a given surface tension. Additionally, the drops can collide with each other or against the walls which makes it a fully resolved four-way coupled simulation.Our simulations show that the net drag reduction increases with increasing deformability of bubbles and this is not related to any preferential accumulation. We show that finite-size bubbles block the momentum transfer from the inner to the outer cylinder thus laminarising the bulk and leading to drag reduction.
机译：大于湍流中分散的Kolmogorov刻度（有限大小）的可变形气泡/滴可以通过多种方式改变整体和局部流动特性。它们可以增强或减少净动量/热传递，改变液滴/气泡的路径，甚至改变流体混合物的流变性。仍然缺少对这些系统的详细理解，因此我们使用直接数值模拟来研究两相湍流泰勒-库埃特（TC）流动，以进一步了解此问题。分散相$（10 ^ 3滴）$的沉浸边界方法。分散液滴的变形是通过多物理场相互作用势方法获得的，该方法针对具有给定表面张力的任何液-液界面的变形动力学进行了调整。此外，液滴可以相互碰撞或碰撞到墙壁上，这使其成为完全解析的四向耦合模拟。我们的模拟表明，净阻力减小随气泡变形能力的增加而增加，并且与任何优先积累无关。我们表明，有限尺寸的气泡会阻止动量从内圆柱传递到外圆柱，从而使体积分层并导致减阻。

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