Flows in Microchannels and Cavities – Visco-Elasticity, Faradaic Charging and Surface Roughness Effects

Abstract:

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Two phenomena for flows in microchannels, namely visco-elastic instability and Faradaic charging effects, are discussed. Aqueous solutions, which do not exhibit elastic behaviors, will behave visco-elastically with the addition of a small amount of polymers. Visco-elastic flow instability which promote mixing has been observed in the flow of these visco-elastic solutions through a constriction in microchannels. In addition, we recently show experimentally the existance of Faradaic charging in AC-electrokinetic (ACEK) flow. Lastly, surface roughness effects in micro- plastic injection molding are highlighted. The micro-injection molding process involves the flow of polymer melt in micro-cavities. Our recent investigations demonstrate that the flow model for macro-cavities could be employed satisfactorily to simulate the flow in micro-cavities if roughness effects are considered in an appropriate manner.

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Periodical:

Edited by:

Selin Teo, A. Q. Liu, H. Li and B. Tarik

Pages:

73-76

DOI:

10.4028/www.scientific.net/AMR.74.73

Citation:

Y. C. Lam "Flows in Microchannels and Cavities – Visco-Elasticity, Faradaic Charging and Surface Roughness Effects", Advanced Materials Research, Vol. 74, pp. 73-76, 2009

Online since:

June 2009

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$35.00

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