纳米颗粒吸附微管道水流特性的格子Boltzmann方法模拟

Lattice Boltzmann method simulation for water flow through microchannel adsorbed by nanoparticles

纳米颗粒吸附可以显著降低微管道的水流阻力。针对纳米颗粒吸附毛细管流动试验特征,引入速度滑移边界条件,采用Lattice Boltzmann(LB)模型分别模拟了纳米颗粒吸附前后的毛细管流动状态。结果表明,柴油处理前,毛细管内的去离子水流动规律满足N-S方程;纳米颗粒吸附后,毛细管道壁面的润湿性发生改变,边界上产生了滑移速度,纳米颗粒吸附产生的理论滑移长度达到85 nm。数值模拟结果与试验数据、理论数据吻合较好,表明LB方法数值模拟具有相当精确的可预测性。

The adsorption of nanoparticles could significantly reduce the drag of water flow in microchannel. According to the features of capillary flow experiment with adsorption of nanoparticles, the Lattice Bohzmann （LB） model was used to simulate the flow states inside the capillary before and after the adsorption of nanoparticles. The results show that before the treatment of diesel oil, the flow of deionized water in the capillary satisfied the law of N-S equation. After the adsorption of nanoparticles, the surface wettability of the capillary wall changed, and slip velocity appeared on the boundary. The theoretical slip length reached 85 nm. The numerical simulation results agree well with experimental data and theoretical data, which shows that this method is efficient and accurate.