摘要
本文采用非平衡分子动力学方法,通过分析固液界面处的温度分布及吸附层原子数密度分布,研究了纳米颗粒表面界面效应和吸附层的相关特性。结果表明,固液界面处出现了明显的温度骤降,说明固液界面对热量传递存在阻碍作用;随着界面作用力系数的增加,温度变化剧烈程度降低;热阻随固液原子间作用力的增大而减小;相同体积分数下,纳米颗粒因半径减小而数量增多,会造成更大的界面热阻。增大固液原子间作用力可以吸引更多原子进入吸附层,形成更致密的吸附层。加入纳米颗粒后,基液原来的结构分布变得更紧密,有利于提高纳米流体的热导率。
The non-equilibrium molecular dynamics method was used to study the interface effect of nanoparticles and the characteristics of adsorption layer by analyzing the temperature distribution at the solid-liquid interface and the atomic number density distribution of the adsorption layer.The results show that there is an obvious temperature drop at the solid-liquid inter-face,indicating that the solid-liquid interface has an resistance effect on heat transfer.With the increase of the interfacial force coefficient,the severity of temperature change decreases.And the thermal resistance decreases with the increase of the interatom-ic force.Under the same volume fraction,the number of nanoparticles increases with the decrease of radius,resulting in greater interfacial thermal resistance.Increasing the force between solid and liquid atoms can attract more atoms into the adsorption layer and form a denser adsorption layer.After the addition of nanoparticles,the original structure distribution of the base liquid be-comes tighter,which is conducive to improving the thermal conductivity of the nanofluid.
作者
李克杰
耿佃桥
张世超
Li Kejie;Geng Dianqiao;Zhang Shichao(College of Metallurgy,Northeast University,Shenyang 110819,China;Key Laboratory of Materials Electromagnetic Process Research of Ministry of Education,Northeast University,Shenyang 110819,China)
出处
《低温与超导》
CAS
北大核心
2023年第11期83-89,95,共8页
Cryogenics and Superconductivity
基金
中央高校基本科研业务费专项资金(180904007)资助。
关键词
纳米流体
分子动力学
界面效应
吸附层
Nanofluids
Molecular dynamics
Interface effect
Adsorption layer
