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相对于普通流体而言,纳米流体能够增强换热。该文利用线性响应理论结合平衡分子动力学方法对Cu/Ar纳米流体的导热系数增强进行了研究。在基液流体Ar中对加入0.43%体积百分比的Cu纳米颗粒后,纳米流体的导热系数升高8.3%;要高于Maxwell的3预测值。通过对热流密度中固体、液体以及交互作用3部分对整体导热系数的贡献进行分析,发现除了基液本身以外,纳米颗粒和基液之间的交互作用是最主要的影响因素,而固体本身对导热系数提高的影响可以忽略不计。在模拟过程中还发现在纳米颗粒附近存在吸附现象。
Nanofluids can enhance heat transfer relative to normal fluids. In this paper, the thermal response of Cu / Ar nanofluids has been studied by linear response theory and equilibrium molecular dynamics method. The thermal conductivity of the nanofluids increased by 8.3% after adding 0.43% by volume of Cu nanoparticles in the base fluid Ar, which is higher than that predicted by Maxwell. By analyzing the contributions of the solid, liquid and interaction components in the heat flux to the overall thermal conductivity, it is found that the interaction between the nanoparticle and the base fluid is the most important factor except for the base fluid itself, whereas the solid itself The effect of increasing thermal conductivity is negligible. It was also found during the simulation that there was adsorption near the nanoparticles.