基于非平衡分子动力学的纳米流体导热系数的研究  

Research on Thermal Conductivity of Nanofluids Based on Non-equilibrium Molecular Dynamics

作　　者：牟宝林 唐美玲 盛伟[2] 张小辉 MU Baolin;TANG Meiling;SHENG Wei;ZHANG Xiaohui(School of Energy and Power,Shenyang Institute of Engineering,Shenyang 110136,Liaoning Province;Education and Teaching Supervision Department,Shenyang Institute of Engineering,Shenyang 110136,Liaoning Province;Science and Technology Division,Shenyang Institute of Engineering,Shenyang 110136,Liaoning Province)

机构地区：[1]沈阳工程学院能源与动力学院,辽宁沈阳110136 [2]沈阳工程学院教育教学督导处,辽宁沈阳110136 [3]沈阳工程学院科技处,辽宁沈阳110136

出　　处：《沈阳工程学院学报（自然科学版）》2024年第4期30-36,共7页Journal of Shenyang Institute of Engineering:Natural Science

基　　金：辽宁省高校创新人才专项计划项目(LR2020089)。

摘　　要：纳米流体以其较高的热导率成为近些年来研究的热点。以Cu-R245fa纳米有机工质的导热系数为研究对象,采用非平衡分子动力学方法,选择适用于R245fa有机工质的势能函数,计算纳米有机工质的导热系数,绘制纳米有机工质的径向分布函数、分子运动轨迹及能量曲线。结果表明:在工质中分别加入0.22%、0.55%、0.82%和1.0%的Cu纳米颗粒后,热导率分别增加了1.84%、5.02%、8.28%和11.43%,增强效应明显,利用径向分布函数证实了纳米颗粒表面存在吸附层,厚度约为0.37 nm;此外,在Cu纳米颗粒周围聚集着大量的R245fa分子,加剧了分子间的相互碰撞,为进一步研究纳米流体的传热效率提供了依据。Based on the high thermal conductivity of nanofluids,they have become one of the research hotspots in recent years.This article adopts the non-equilibrium molecular dynamics(NEDM)method to study the thermal conductivity of Cu-R245fa nano-organic working fluid.The potential energy function suitable for R245fa organic working fluid is selected to calculate the thermal conductivity of the nano organic working fluid,and plot the radial distribution function(RDF),molecular motion trajectory,and energy curve of the nano organic working fluid.The results show that the thermal conductivity increases by 1.84%,5.02%,8.28%,and 11.43%,respectively after adding 0.22%,0.55%,0.82%,and 1.0%Cu nanoparticles,which indicates a significant enhancement effect.The radial distribution function is used to confirm the existence of an adsorption layer on the surface of the nanoparticles,with a thickness of approximately 0.37nm.It is also found that a large number of R245fa molecules are clustered around the Cu nanoparticles,exacerbating intermolecular collisions.This provides a basis for further research on the heat transfer efficiency of nanofluids.

关 键 词：纳米有机工质 非平衡分子动力学方法 热导率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]