本申请提出一种集动狭缝设计、动力学分析、跨尺度仿真建模和实验验证于一体的切削液向刀-工-屑跨尺度狭缝渗流动特性与作用机理的研究新思路：引入基于分子间作用力的狭缝表面能理论和分子动力学模拟方法，分析狭缝表界面润湿、移动接触线和毛细作用，研究液滴向静止跨尺度狭缝渗流特性；引入狭缝微纳流动理论和耗散粒子动力学模拟方法，分析动狭缝的吸附、毛细动力和粘滞作用，研究液滴向运动跨尺度狭缝渗流动特性；引入狭缝新鲜表面作用理论和从头计算分子动力学模拟方法，分析动狭缝的微液滴和微纳气泡动力学特性，研究切削液向刀-工-屑跨尺度狭缝渗流动特性；引入金属切削原理和复合量子力学/分子力学模拟方法，分析跨尺度薄膜润滑、狭缝对流蒸发换热、表面活化、狭缝与摩擦腐蚀作用，研究基于渗流动特性的切削液润滑和冷却等作用机理。本项目研究紧密结合金属切削行业的瓶颈性基础研究问题，具有较好的科学研究价值和工程实际意义。

Integrated with moving-slit design, dynamic analysis, trans-scale simulation modeling and experimental verification, this application presents a new approach to the research on seepage dynamics into slit of tool-workpiece-chip and mechanism of cutting fluid. Guided by slit surface energy theory and molecular dynamics simulation (MD), slit interfacial wetting, moving contact line and capillarity of slit are analyzed, and static seepage of trans-scale slit will be researched. Based on theory of slit micro-nano flow and dissipative particle dynamics (DPD) simulation, adsorption of moving-slit, capillary force and viscous effect are analyzed, and dynamical seepage of trans-scale slit will be researched. Provided with fresh interface interaction of slit and ab initio molecular dynamics simulation method, dynamics of micro drop and micro-nano bubble in moving-slit are analyzed, and dynamical seepage of cutting fluid into tool-workpiece-chip will be researched. With metal-cutting principles and quantum mechanics/molecular mechanics simulation method (QM/MM), trans-scale thin-film lubrication, convective evaporation heat transfer in slit, surface activation, slit corrosion and friction corrosion are analyzed, and interaction mechanism of cutting fluid will be researched. This project is closely related to the fundamental research subject in metal cutting industry, which has a good significance of scientific research and industrial application.