The stabilizing effect of shear thinning on the onset of purely elastic instabilities in serpentine microflows.
The stabilizing effect of shear thinning on the onset of purely elastic instabilities in serpentine microflows.
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DOI：
10.1039/c6sm00326e
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发表时间：
2016-07-20
期刊：
影响因子：
3.4
通讯作者：
Lindner A
中科院分区：
文献类型：
--
作者：
Casanellas L;Alves MA;Poole RJ;Lerouge S;Lindner A
我们在实验和数值上确定了粘弹性聚合物溶液中不同剪切减薄水平的弹性流动不稳定性的开始。我们在实验和数值上确定了粘弹性聚合物溶液中不同剪切减薄水平的弹性流动不稳定性的开始。先前使用稀聚合物溶液在微流体蛇形通道中实现的实验表明，弹性不稳定性的发生强烈依赖于通道曲率。Pakdel和McKinley [Phys]提出的一般不稳定标度准则很好地捕捉了标度依赖性。启。[j].农业工程学报，1997,26(1):1 - 4。我们在这里确定了流体剪切变薄对这种纯弹性流动不稳定性开始的影响。通过对一组不同聚合物浓度的高分子量聚乙烯氧化物溶液在微流控蛇形通道中的测试，我们观察到剪切变薄对微流控流动具有稳定作用。使用White-Metzner模型进行的三维数值模拟预测了类似的趋势，而使用Pakdel-McKinley标准的简单缩放分析无法捕捉到这些趋势。
We determine both experimentally and numerically the onset of elastic flow instabilities in viscoelastic polymer solutions with different levels of shear thinning. We determine both experimentally and numerically the onset of elastic flow instabilities in viscoelastic polymer solutions with different levels of shear thinning. Previous experiments realized in microfluidic serpentine channels using dilute polymeric solutions showed that the onset of elastic instabilities strongly depends on the channel curvature. The scaling dependence is well captured by the general instability scaling criterion proposed by Pakdel and McKinley [Phys. Rev. Lett., 1996, 76, 2459:1–4]. We determine here the influence of fluid shear thinning on the onset of such purely-elastic flow instabilities. By testing a set of polyethylene oxide solutions of high molecular weight at different polymer concentrations in microfluidic serpentine channels we observe that shear thinning has a stabilizing effect on the microfluidic flow. Three-dimensional numerical simulations performed using the White–Metzner model predict similar trends, which are not captured by a simple scaling analysis using the Pakdel–McKinley criterion.
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影响因子：
3.1
作者：
MCKINLEY, GH;BYARS, JA;ARMSTRONG, RC
通讯作者：
ARMSTRONG, RC
影响因子：
3.7
作者：
LARSON, RG;SHAQFEH, ESG;MULLER, SJ
通讯作者：
MULLER, SJ
影响因子：
7.015
作者：
Dinic, Jelena;Zhang, Yiran;Sharma, Vivek
通讯作者：
Sharma, Vivek
DOI：
10.1098/rspa.1950.0035
发表时间：
1950-01-01
影响因子：
--
作者：
OLDROYD, JG
通讯作者：
OLDROYD, JG
DOI：
10.1039/f29787401818
发表时间：
1978-01-01
期刊：
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II
影响因子：
--
作者：
DOI, M;EDWARDS, SF
通讯作者：
EDWARDS, SF