【摘要】 采用分子模拟方法,研究不同压力、剪切速度、纳米颗粒浓度、温度条件下水基纳米液压液在动力学模型中的流动特性、承载能力和抗磨减摩特性。结果表明:纳米流体承载能力随纳米颗粒浓度的增加而增大;随着负载的增加,基础流体和纳米流体均会发生固化现象,但是纳米流体的过渡压力大于基础流体;壁面间摩擦力在一定范围内会随着纳米颗粒浓度的增大而减小,但过大的纳米颗粒浓度将导致摩擦加剧;纳米流体温度过高将导致壁面间摩擦力急剧升高;水基纳米液压液抗磨减摩机理主要在于纳米颗粒将滑动摩擦转化为滚动摩擦。更多还原

【Abstract】 The flow characteristics, the bearing capacity, wear-resistance and anti-friction properties of water-based nano hydraulic fluid in kinetic modeling is revealed by the molecular simulation. Considering different loads, different shear rates, different concentration of nanoparticles and different temperature. The results show that the bearing capacity increases with the increase of the concentration of nanoparticles. With the increase of load, liquid-solid transitions take place for both base fluids and nanofluids, but the transition pressure for nanofluids is higher than that of the base fluid. The friction between the walls decreases with the increase of the concentration of nanoparticles within certain range, but excessive concentration of nanoparticles leads to friction increasing. The high temperature of nanofluids will cause a sharp increase in friction between walls. The wear-resistance and anti-friction mechanism of water-based nano hydraulic fluid lies in that nanoparticles can change the sliding friction to rolling friction.更多还原