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

ISSN号：1001-6538
期刊名称：科学通报(英文版)
时间：0
页码：-
分类：O35[理学—流体力学;理学—力学] TF777[冶金工程—钢铁冶金]
作者机构：[1]State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University, Xi'an 710049, China, [2]College of Physical Sciences, University of Chinese Academyof Sciences, Beijing 100049, China
相关基金：This work was supported by the National Natural Science Foundation of China （50876111, 50936006, and 51121092）.
相关项目：磁约束热核聚变反应堆能量转化部件中关键工程热物理问题研究

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, Nanochannel flows , Poiseuille , Couette Solid particle , MD simulation

中文摘要：

我们进行了探讨新奇流动行为的模拟在 nanochannels 由一个稳固的粒子导致了的分子的动力学(MD ) 。二基本流动，即， Poiseuille 和 Couette，涉及这研究。为 Poiseuille 流动，数字密度的分发在隧道并且在墙附近的中心展出变化，它被强壮的相互作用从粒子和墙的原子引起。为更强壮的外部驱动力，液体原子向隧道的中心移动，一些洞出现在能流动的地区。更大的外部驱动力和更大的粒子在 nanochannels 快速使液体动人。为 Couette 流动，粒子在 shear 流动在粒子原子之中在速度差别下面旋转。墙附近的液体原子变得很少发生并且搬到隧道的中心。集中地定位的液体原子的速度由于粒子减少，导致 untypical 非线性的 Couette 流动。在摘要，稳固的粒子在 nanochannel 流动带给新 fluidsolid 接口和相互作用，它导致几新奇行为。

英文摘要：

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.