Abstract
Surface roughness effects are dominant at microscale. In this study, microchannels are fabricated on Silicon substrate. The roughness morphology is modeled for the fabricated structure using Weierstrass-Mandelbrot function for self-similar fractals. A two dimensional model of hexagonal passive micromixer is analyzed with surface roughness present on inner walls of channels using parallel Lattice Boltzmann method, implemented on sixteen node cluster. The results are compared by simulating this micromixer structure using Navier–Stokes equations. The experimental results on the fabricated micromixers are also presented. The effects of relative roughness, fractal dimension and Reynolds number are discussed on laminar flow in hexagonal passive micromixers. The study concludes the importance of modeling surface roughness effect for better mixing efficiency.
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Acknowledgments
The authors would like to thank VNIT for their continued support. Authors would like to thank ADA for providing the necessary CAD tools through NPMASS initiative. Authors are grateful to CEN, IIT Bombay and Department of Mechanical Engineering, IIT Bombay for providing the opportunity to carry out fabrication of microfluidic devices.
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Pendharkar, G., Deshmukh, R. & Patrikar, R. Investigation of surface roughness effects on fluid flow in passive micromixer. Microsyst Technol 20, 2261–2269 (2014). https://doi.org/10.1007/s00542-013-1957-y
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DOI: https://doi.org/10.1007/s00542-013-1957-y