A Boundary Element Model of Microbubble Sticking and Sliding in the Microcirculation.
A Boundary Element Model of Microbubble Sticking and Sliding in the Microcirculation.
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DOI：
10.1016/j.ijheatmasstransfer.2008.04.050
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发表时间：
2008-11
影响因子：
5.2
通讯作者：
Bull, Joseph L.
中科院分区：
文献类型：
--
作者：
Eshpuniyani, Brijesh;Fowlkes, J. Brian;Bull, Joseph L.
本文用边界元法对极低雷诺数下压力驱动的二维槽道流（Stokes流）进行了数值研究，其中气泡沿槽道壁沿着滑动。使用坦纳定律对移动的三相接触线进行建模，其中接触线速度与接触角与其平衡值的偏差成线性比例。结果显示有和没有接触角滞后的影响。包括接触角滞后允许我们预测的粘滑行为的气泡，这反过来又影响长期演变和动态的气泡。结果表明，初始快速收缩或膨胀的气泡，以实现与周围的压力场的局部平衡的结果在壁的正应力分布的尖点和凸起。当流体冲进或冲出通道入口和出口时，壁剪切应力也增加（在气泡的上游和下游具有相反的符号）。从长远来看，气泡在沿着通道壁滑动时缓慢膨胀。接触线被发现在任何时候都对应于在壁的正常和剪切应力分布的峰值。还检查了气泡阻塞通过通道的流动的有效性。
A pressure driven 2-D channel flow at very low Reynolds numbers (Stokes flow) with a bubble sticking and sliding along one of the walls is studied computationally using the boundary element method (BEM). The moving three phase contact lines are modeled using a Tanner law wherein the contact line speed is linearly proportional to the deviation of the contact angle from its equilibrium value. Results are presented with and without the effect of contact angle hysteresis. Including contact angle hysteresis allows us to predict the stick-slide behavior of bubbles, which in turn affects the long term evolution and dynamics of the bubbles. It is shown that the initial rapid contraction or expansion of the bubbles to achieve local equilibrium with the surrounding pressure field results in cusps and bulges in the wall normal stress profiles. The wall shear stress also increases (with opposite signs upstream and downstream of the bubble) as the fluid rushes in or out of the channel inlet and outlet. In the long term, bubbles slowly expand as they slide along the channel wall. Contact lines are found to correspond to peaks in the wall normal and shear stress profiles at all times. The effectiveness of bubbles in occluding flow through the channel is also examined.
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DOI：
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发表时间：
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影响因子：
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