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通过引入“滞后阻力”的概念 ,分别用力学方法和热力学方法导出固体表面上液滴平衡时接触角应满足的条件 ;定性地给出了表面湿润性和前进接触角与后退接触角同表面粗糙度的关系 ,分析了前进接触角和后退接触角的物理意义 ;由此给出了接触角滞后现象的一种合理解释 .本文的研究为汽液相变传热过程中的沸腾核化、临界热负荷、最小热流密度、珠状凝结等现象的深刻认识 ,开拓了新的思路 ,传统研究中对粗糙度影响的复杂定量化测量描述也可转化为用接触角单一参数表征和描述的简化方法 .因此本文的认识对研究沸腾和凝结传热有重要的现实意义
By introducing the concept of “hysteresis resistance”, the conditions that the contact angle of the solid surface should meet when the droplet equilibrium is solved are derived by means of mechanics and thermodynamics respectively; the surface wettability and the advancing contact angle and the receding contact angle are given qualitatively; Degree, the physical meaning of the advancing contact angle and receding contact angle is analyzed, and a reasonable explanation of the contact angle hysteresis is given.This paper is about the boiling nucleation during the heat transfer of vapor-liquid phase transition, Heat load, minimum heat flux density, bead condensation and other phenomena, opens up new ideas. The complex and quantitative measurement description of the influence of roughness in traditional research can also be transformed into a simplified method of characterization and description using a single parameter of contact angle Therefore, the understanding of this article is of great practical significance for studying boiling and condensation heat transfer