Novel flow behaviors induced by a solid particle in nanochannels: Poiseuille and Couette  

作　　者：Cheng-Zhen Sun Wen-Qiang Lu Bo-Feng Bai Jie Liu 

机构地区：[1]State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University [2]College of Physical Sciences, University of Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2014年第20期2478-2485,共8页

基　　金：supported by the National Natural Science Foundation of China(50876111,50936006,and 51121092)

摘　　要：We conducted a molecular dynamics(MD)simulation to address the novel flow behaviors induced by a solid particle in nanochannels.Two basic flows,i.e.,Poiseuille and Couette,are involved in this study.For Poiseuille flow,the distribution of number density exhibits fluctuations in the center of channel and near the walls,which are caused by the strong interactions from the atoms of particle and walls.For stronger external driving forces,the fluid atoms move toward the center of channel and some cavities appear in the fluidic zone.Greater external driving forces and bigger particles make the fluid moving quickly in nanochannels.For Couette flow,the particle rotates under the velocity difference among particle atoms in the shear flows.The fluid atoms near the walls become infrequent and move to the center of channel.The velocities of the centrally-located fluid atoms decrease owing to the particle,resulting in an untypical non-linear Couette flow.In summary,the solid particle brings new fluid–solid interface and interactions,which induce several novel behaviors in nanochannel flows.We conducted a molecular dynamics （MD） simulation to address the novel flow behaviors induced by a solid particle in nanochannels. Two basic flows, i.e., Poiseuille and Couette, are involved in this study. For Poiseuille flow, the distribution of number density exhibits fluctuations in the center of channel and near the walls, which are caused by the strong interactions from the atoms of particle and walls. For stronger external driving forces, the fluid atoms move toward the center of channel and some cavities appear in the fluidic zone. Greater external driving forces and bigger particles make the fluid moving quickly in nanochannels. For Couette flow, the particle rotates under the velocity difference among particle atoms in the shear flows. The fluid atoms near the walls become infrequent and move to the center of channel. The velocities of the centrally-located fluid atoms decrease owing to the particle, resulting in an untypical non-linear Couette flow. In summary, the solid particle brings new fluid-solid interface and interactions, which induce several novel behaviors in nanochannel flows.

关 键 词：流动行为 纳米通道 固体粒子 POISEUILLE流 诱发 COUETTE流 强相互作用 固体颗粒 

分 类 号：TQ021.1[化学工程]