纳米流体限制性剪切流的分子动力学模拟
首发时间:2017-03-01
摘要:本文采用分子动力学方法,对纳米流体的限制性剪切流动过程进行了模拟和计算。模拟结果表明:在限制性剪切流动过程中,纳米颗粒的随机运动行为影响着纳米流体的流动特性。纳米颗粒在流动过程中发生了碰撞、聚集和分离过程,纳米颗粒除了在主流X方向具有随机运动行为,在Y和Z方向也具有随机运动行为。纳米颗粒在剪切流动过程中的运动行为具体有上下振动、左右旋转以及布朗运动等,纳米颗粒的随机运动行为主要是因为小尺度原因造成的。在纳米颗粒表面附近,存在一层较薄的液体吸附层,在吸附层内液体分子的排布更加规则,具有了类似固体的特性。纳米颗粒的随机运动行为影响着纳米流体的密度分布,从而使纳米流体的密度分布不均。
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The confined shear flow of nanofluids by molecular dynamics Simulation
Abstract:Molecular dynamics(MD) simulations are performed to simulate the confined shear flow of nanofluids. The simulation results show that the random movement of nanoparticles affects the flow characteristics of nanofluids in the process of confined shear flow. The collision, aggregation and separation of nanparticles happened in the process of confined shear flow. In addition to the random movement of nanoparticles in the x direction, there are also have random movements in the y and z direction. Various movement behavior of nanoparticles occurred, such as translation, rotation and brownian motion, and random motion behavior of nanoparticles is mainly due to the small scale. On the surface of nanoparticles, there is a thin liquid adsorption layer, which is arranged very regular. And the random movement of nanoparticle behavior affects the density distribution of nanofluids, so the density of the nanofluids are inhomogeneous.
Keywords: nanofluids confined shear flow flow characteristics molecular dynamics simulation
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