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Study for the particle's scale effect on some thermophysical properties of nanofluids by a simplified molecular dynamics method

机译：用简化的分子动力学方法研究颗粒对纳米流体某些热物理性质的尺度效应

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摘要

For a stationary nanofluids of the volume fractions (a) less than 8%, a simplified molecular dynamics (MD) simulation method is constructed and used to simulate the thermophysical properties of nanofluids: thermal conductivity and viscosity. The better agreement between present numerical results and experimental data is presented in this paper. It shows the simplified dynamics simulation method to be an effective method to forecast some thermal properties of nanofluids. Many former experiments have shown that this new heat transfer fluids-nanofluids can greatly enhance the heat-transfer efficiency. This work further gives the effects of the volume fraction and the size of nanoparticles on the thermal conductivity and the viscosity of nanofluids. Numerical results show that, decreasing size of nanoparticle or increasing the volume fraction can increase thermal conductivity with increasing viscosity; for suitable volume fraction and size, increasing viscosity with improving heat transfer capability is acceptable.
机译：对于体积分数（a）小于8％的固定纳米流体，构建了简化的分子动力学（MD）模拟方法，并用于模拟纳米流体的热物理性质：导热系数和粘度。本文提出了目前的数值结果和实验数据之间的更好的一致性。它表明简化的动力学模拟方法是预测纳米流体某些热性质的有效方法。以前的许多实验表明，这种新型的传热流体纳米流体可以大大提高传热效率。这项工作进一步给出了纳米颗粒的体积分数和大小对纳米流体的热导率和粘度的影响。数值结果表明，减小纳米颗粒的尺寸或增加体积分数可以随着粘度的增加而提高热导率。对于合适的体积分数和尺寸，可以通过提高传热能力来增加粘度。

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