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纳米流体限制性剪切流的分子动力学模拟

发表时间:2018-04-28  浏览量:1081  下载量:289
全部作者: 杨鹏志,唐胜利
作者单位: 重庆大学动力工程学院
摘 要: 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模拟和计算。模拟结果表明,在纳米流体限制性剪切流动过程中,纳米颗粒的随机运动行为影响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、左右旋转及布朗运动等,纳米颗粒的随机运动行为主要是由于小尺度造成的。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,具有类似固体的特性。纳米颗粒的随机运动行为影响纳米流体的密度分布,从而使纳米流体的密度分布不均。
关 键 词: 工程热物理;纳米流体;限制性剪切流;流动特性;分子动力学
Title: Molecular dynamics simulation for confined shear flow of nanofluids
Author: YANG Pengzhi, TANG Shengli
Organization: College of Power Engineering, Chongqing University
Abstract: Molecular dynamics methods are performed to simulate and calculate 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 happen in the process of confined shear flow. In addition to the random movement of nanoparticles in the x direction, there are also random movements in the y and z directions. Various movement behaviors of nanoparticles occur, 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, in which the liquid molecules arrange very regularly, so that the nanoparticles have the property of solid. The random movement behavior of nanoparticles affects the density distribution of nanofluids, so the density of the nanofluids are inhomogeneous.
Key words: engineering thermophysics; nanofluids; confined shear flow; flow characteristics; molecular dynamics simulation
发表期数: 2018年4月第8期
引用格式: 杨鹏志,唐胜利. 纳米流体限制性剪切流的分子动力学模拟[J]. 中国科技论文在线精品论文,2018,11(8):761-768.
 
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