基于反扰动非平衡分子动力学的纳米流体导热增强机理研究

相较于水、乙二醇等常规流体，纳米流体出色的传热效果使其成为近十年来研究的热点之一。利用一种反扰动非平衡分子动力学方法对纳米流体的导热增强机理进行了模拟研究。在基液Ar 中加入 Cu 纳米颗粒后, 纳米流体的热通量和热导率均发生了不同程度的改变，纳米颗粒体积分数的变化，在一定程度上改变了纳米流体内部的能量传递过程。进一步分析了纳米流体热导率强化的微观作用机理，发现纳米颗粒的加入，使得纳米流体的微观结构具有了类似晶体的微观结构特性，在颗粒尺寸较小的情况下，流体内部受温度梯度作用效应明显。

Study on thermal conductive enhancement mechanism of nanofluid based on anti-disturbance non-equilibrium molecular dynamics

Compared with conventional fluids such as water and ethylene glycol, the excellent heat transfer effect of nanofluids has made it one of the hotspots of research in the past decade. In this paper, the heat conduction enhancement mechanism of nanofluids is simulated by a reverse non equilibrium molecular dynamics method. The heat flux density and thermal conductivity of nanofluids change with the addition of Cu nanoparticles in Ar, and the volume fraction of nanoparticles changes the energy transfer process in nanofluids to a certain extent. Furthermore, the microscopic mechanism of the enhancement of thermal conductivity of nanofluids is analyzed. It was found that the addition of nanoparticles made the microstructure of nanofluids similar to that of crystals. Under the condition of smaller particle size, the effect of temperature gradient on the fluid is obvious.