The nanoscale effects of solid–fluid molecular interactions on the nanoconfined fluid flow have received increasing attention in science and engineering. Additionally, due to the complex microstructures of porous media, the nanoconfined fluid flow behaviors will be more complicated. In this paper, we comprehensively use theoretical analysis and lattice Boltzmann simulations with a new slip curved boundary condition to study the microstructures and molecular interaction effects on nanoconfined water flow. The viscous dissipation rate caused by the entrance effect (streamlines bending), and the nanoscale effects of the slip boundary and the varying interfacial water viscosity caused by molecular interactions are considered and discussed. The results show that the entrance viscous dissipation rate can result in the negative effects near the pore entrance and exit because of the bending streamlines. The increasing entrance viscous dissipation rate can make the enhancement factor approach to 1 by weakening the nanoscale effects. With an increasing contact angle, the entrance viscous dissipation rate causes the main pressure drop and gradually dominates the overall water flow. As nanoscale effects enhance the water flow capacity, the enhancement factor decreases to near 1 with an increasing porous media size because of the decreasing nanoscale effects. As nanoscale effects weaken the water flow capacity, due to the different decreasing effects of the slip length and interfacial water viscosity, the enhancement factor decreases first and then increases to near 1. Our work can guide for studying the oil/water flow in unconventional reservoirs and provide microscopic basics to design artificial nanopores with excellent performance.

固-流体分子相互作用对纳米级流体流动的纳米级效应在科学和工程领域受到越来越多的关注。此外，由于多孔介质的微观结构复杂，纳米限域流体的流动行为会更加复杂。在本文中，我们综合运用理论分析和格子玻尔兹曼模拟以及一种新的滑移曲线边界条件来研究微观结构和分子相互作用对纳米约束水流的影响。考虑和讨论了由入口效应（流线弯曲）引起的粘性耗散率，以及滑移边界的纳米级效应和由分子相互作用引起的界面水粘度变化。结果表明，由于弯曲的流线，入口粘性耗散率会导致孔隙入口和出口附近的负面影响。增加入口粘性耗散率可以通过减弱纳米级效应使增强因子接近 1。随着接触角的增大，入口粘性耗散率会导致主压降，并逐渐主导整个水流。随着纳米级效应增强水的流动能力，由于纳米级效应的降低，增强因子随着多孔介质尺寸的增加而减小到接近 1。由于纳米级效应削弱了水的流动能力，由于滑移长度和界面水粘度的降低效果不同，增强因子先减小后增大至接近1。