热壁作用下超薄纳米流体的剪切流动特性Shear Flow Characteristics of Ultra-Thin Nanofluid between Two Hot Walls
周剑锋
摘要(Abstract)：
以Couette流动为原型,在壁面Pt原子、液相Ar原子和纳米Cu颗粒相互作用的基础上,考虑与温度相关壁面Pt原子的热振动,建立了热壁作用下超薄纳米流体剪切流动的分子动力学模型。研究发现,壁面Pt原子的振动对纳米流体系统中各颗粒运动的影响显著,Ar原子和纳米Cu颗粒沿膜厚方向呈不均匀分布。由于膜厚方向Ar原子的非均匀分布及纳米Cu颗粒的影响,液膜各层的切向速度在膜厚方向上呈非线性变化,且存在明显的边界速度滑移。壁面剪切速度增大,边界速度滑移率增大,系统温度对速度滑移亦有影响。获得了纳米流体的剪切黏度,其随纳米颗粒体积分数的增大而增大。
关键词(KeyWords)： 纳米流体;分子动力学模拟;速度滑移;剪切黏度
基金项目(Foundation): 国家自然科学基金(51205184);; 江苏省自然科学基金(BK2011810);; 江苏省高校自然科学基金(11KJB480004)
作者(Author): 周剑锋
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