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http://dx.doi.org/10.3795/KSME-B.2017.41.6.429

Numerical Study on Couette Flow in Nanostructured Channel using Molecular-continuum Hybrid Method  

Kim, Youngjin (School of Mechanical Engineering, Pusan Nat'l Univ.)
Jeong, Myunggeun (School of Mechanical Engineering, Pusan Nat'l Univ.)
Ha, Man Yeong (School of Mechanical Engineering, Pusan Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.41, no.6, 2017 , pp. 429-434 More about this Journal
Abstract
A molecular-continuum hybrid method was developed to simulate microscale and nanoscale fluids where continuum fluidics cannot be used to predict Couette flow. Molecular dynamics simulation is used near the solid surface where the flow cannot be predicted by continuum fluidics, and Navier-Stokes equations are used in the other regions. Numerical simulation of Couette flow was performed using the hybrid method to investigate the effect of solid-liquid interaction and surface roughness in a nanochannel. It was found that the solid-liquid interaction and surface roughness influence the boundary condition. When the surface energy is low, slippage occurs near the solid surface, and the magnitude of slippage decreases with increase in surface energy. When the surface energy is high, a locking boundary condition is formed. The roughness disturbs slippage near the solid surface and promotes the locking boundary condition.
Keywords
Molecular-continuum Hybrid Method; Molecular Dynamics Simulation; Finite Volume Method; Nano Channel Flow;
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