Structural Evolution of Colloidal Gels During Constricted Microchannel Flow

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• 作者：Jacinta C. Conrad ; Jennifer A. Lewis
• 刊名：Langmuir
• 出版年：2010
• 出版时间：May 4, 2010
• 年：2010
• 卷：26
• 期：9
• 页码：6102-6107
• 全文大小：892K
• 年卷期：v.26,no.9(May 4, 2010)
• ISSN：1520-5827

文摘

We investigate the structure of colloidal gels flowing through constrictions in microchannels using confocal microscopy. As the gel traverses the constricted region, both the average velocity and particle density increase downstream. While the average flow profile is smoothly varying, stagnation zones develop at the constriction entry, leading to markedly nonuniform local flow profiles. Dense clusters undergo shear-induced yielding at intercluster boundaries, which enhances the structural heterogeneity of the suspension at the constriction outlet.