Document Type
Article
Publication Date
2012
Journal or Book Title
Applied Physics Letters
Volume
101
Issue
18
First Page
184102
DOI
10.1063/1.4764293
Abstract
Most micro-channel fabrication strategies generate nano-to-micro-scale, stochastic surface roughness. This inherent stochasticity can potentially be harnessed to direct microfluidic operations such as self-cleaning behavior and localized mixing. This work investigates the effect of stochastic nanoscale roughness on low to moderate Reynolds number Newtonian flow using concurrent modeling and experiments. We fabricate a microscopic channel with tailored hydrofluoric-acid-etched rough surfaces. Optical profilometry and micro-particle-image-velocimetry (micro-PIV) are used to characterize the surface roughness and flow field and is integrated with direct numerical simulation that resolves effects of nanoscale roughness. Results indicate that nanoscale roughness causes flow perturbations that extend up to the mid-plane and is insensitive to flow-rates.
Rights
Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Copyright Owner
American Institute of Physics
Copyright Date
2012
Language
en
File Format
application/pdf
Recommended Citation
Jaeger, Robert; Ren, Jing; Xie, Yu; Sundararajan, Sriram; Olsen, Michael G.; and Ganapathysubramanian, Baskar, "Nanoscale surface roughness affects low Reynolds number flow: Experiments and modeling" (2012). Mechanical Engineering Publications. 74.
https://lib.dr.iastate.edu/me_pubs/74
Comments
The following article appeared in Applied Physics Letters 101 (2012): 184102, doi:10.1063/1.4764293.