Numerical investigation on frictional pressure loss in a perfect square micro channel with roughness and particles |
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Authors: | Donghyouck Han Kyu-Jung Lee |
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Affiliation: | (1) Research Institute of Engineering & Technology, Korea University, 136-701 Seoul, Korea;(2) Department of Mechanical Engineering, Korea University, 136-701 Seoul, Korea |
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Abstract: | A numerical study is performed to investigate the effect of inner surface roughness and microparticles on adiabatic single
phase frictional pressure drop in a perfect square micro channel. With the variation of particles sizes (0.1 to 1 μm) and
occupied volume ratio (0.01 to 10%) by particles, the Eulerian multi-phase model is applied to a 100 μm hydraulic diameter
perfect square micro channel in laminar flow region. Frictional pressure loss is affected significantly by particle size than
occupied volume ratio by particles. The particle properties like density and coefficient of restitution are investigated with
various particle materials and the density of particle is found as an influential factor. Roughness effect on pressure drop
in the micro channel is investigated with the consideration of roughness height, pitch, and distribution. Additionally, the
combination effect by particles and surface roughness are simulated. The pressure loss in microchannel with 2.5% relative
roughness surface can be increased more than 20% by the addition of 0.5 μm diameter particles. |
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Keywords: | Microfluidics Pressure Drop Numerical Simulation Friction Factor MEMS Roughness Nano-Particle |
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