Morphology and Breaking of Latex Particle Deposits at a Cylindrical Collector in a Microfluidic Chamber

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• 作者：Yasuyuki Kusaka ; Jrme F. L. Duval ; Yasuhisa Adachi
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：December 15, 2010
• 年：2010
• 卷：44
• 期：24
• 页码：9413-9418
• 全文大小：265K
• 年卷期：v.44,no.24(December 15, 2010)
• ISSN：1520-5851

文摘

We report an analysis for the morphology and breaking behavior of deposits of spherical latex particles (1 and 3.6 μm in diameter) at a cylindrical collector in a microfluidic channel fabricated by soft-lithography. In-situ observation of particle deposition over a large range of flow rate conditions evidence the relationship between deposit morphology and mode of particle transport toward the collector. For low Pclet number (Pe), particle deposits are nearly uniform all over the collector surface except at the rear where particles do not attach. Upon increase of Pe, deposits gradually adopt a columnar morphology at the collector stagnation point. These results are qualitatively consistent with previously reported Monte Carlo simulations of deposits formation in stagnation point flow systems. However, these simulations fail to quantitatively predict the observed deposition at the rear of the collector for sufficiently high flow rate. Additional deposit breaking experiments together with numerical evaluations of particle flux around the collector suggest that such “anomalous” deposition at large Pe is significantly governed by concomitant detachment of deposited particles at the stagnation point and the presence of recirculation flow at the collector rear. Finally, kinetics of deposition are discussed in connection with particle size-dependence of deposit breaking features.