基于势能二元场的跨尺度界面与多相流统一模型 A Unified Model of Cross-Scale Interface and Multiphase Flow Based on Dual Potential Field

针对界面力学与多相流研究存在宏微观理论脱节、物性参数依赖试验标定、相变演化缺少统一解析描述等难题,本文构建势能二元场理论体系,将束缚作用定义为阴场势能、热扰动与弥散作用定义为阳场势能。依托Ginzburg-Landau相场理论、分形几何与Lennard-Jones分子势统计方法,建立由微观分子作用至介观界面、再到宏观多相流动的逐级推导体系,从理论上消去表面张力、湍流黏性、流固边界相关经验拟合项。采用段慧玲团队仿生超滑、复合材料脱粘、气泡演化三组试验数据完成模型校核,依托理论规律提出深海抗高压涂层、油气输送管道减阻、高温复合材料优化方案,同时给出五项可量化试验预言。计算与试验结果表明,该模型可实现跨尺度界面行为统一描述,具备明确的理论价值与工程应用前景。

Abstract

Aiming at the problems including separation between microscopic and macroscopic theories, experimental calibration of physical parameters and lack of unified analytical expression for phase transition in interface mechanics and multiphase flow, a dual potential field theory is established in this paper. The binding effect is defined as negative potential field, while thermal disturbance and dispersion effect correspond to positive potential field. Combined with Ginzburg-Landau phase field theory, fractal geometry and statistical processing of Lennard-Jones potential, a progressive derivation system spanning microscopic molecular interaction, mesoscopic interface and macroscopic multiphase flow is constructed, removing empirical coefficients for surface tension, turbulent viscosity and fluid-solid boundary. Three groups of experimental data from Duan Huiling’s research group, including bionic superlubricity, composite debonding and bubble evolution, are used for model verification. Optimization schemes of deep-sea pressure-resistant coating, drag reduction for oil-gas pipeline and high-temperature composite are put forward, together with five quantifiable predictions. The verification proves that the proposed model can uniformly characterize cross-scale interface behavior with good theoretical and engineering value.