Drop breakup in the flow through fixed beds via stochastic simulation in model Gaussian fields
Drop breakup in the flow through fixed beds via stochastic simulation in model Gaussian fields
复制标题
通过模型高斯场中的随机模拟，流经固定床的液滴破碎
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
E. Shaqfeh
中科院分区：
文献类型：
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作者：
A. Mosler;E. Shaqfeh
Shaqfeh和Koch已经证明，在超过一定的临界流速时，流过稀释的纤维无序固定床会产生较大的聚合物构象变化[J]。流体力学。244,17(1992)]。我们现在研究这种流动对粘性液滴的形状和破裂的影响。由于稀固定床的流动相当于某个各向异性高斯流场，因此我们遵循之前的论文，通过谱展开再现了流动模型，其中波数矢量选择自统计分布，以确保实现所需的速度场[物理学]。流体9,1222(1997)]。通过综合大量的流动实现，我们研究了流场高斯统计平均的模型液滴形状的动力学。采用一阶、二阶和三阶小变形理论对水滴表面进行了建模，可以准确地预测经典强流的临界条件。而一阶模型产生有界av…
Shaqfeh and Koch have shown that the flow through a dilute disordered fixed bed of fibers produces large polymer conformation change beyond a certain critical flow rate [J. Fluid Mech. 244, 17 (1992)]. We now examine the effect of this flow on the shape and breakup of viscous drops. Because the flow through a dilute fixed bed is equivalent to a certain anisotropic Gaussian flow field, we follow our previous paper and reproduce a model of the flow through a spectral expansion where the wave number vectors are chosen from statistical distributions which ensure that the desired velocity field will be realized [Phys. Fluids 9, 1222 (1997)]. We examine the dynamics of model drop shapes, averaged over the Gaussian statistics of the flow field, by synthesizing a large number of flow realizations. The drop surface is modeled using the first, second, and third order small deformation theories which can accurately predict critical conditions in classical strong flows. While the first order model yields a bounded av...