瞬态摩擦荷电对水口壁面夹杂物黏附动力学影响机制研究

本项目针对浸入式水口结瘤堵塞与钢液中夹杂物黏附沉积密切相关的特点，研究瞬态摩擦荷电及其诱导电场因素与夹杂物黏附过程之间的相关性及其作用机制。通过在水口结瘤层生长研究中引入颗粒运动摩擦特征分析，阐明夹杂物颗粒、水口壁面及钢液之间瞬态摩擦荷电与水口结瘤的相关性及其作用规律。围绕夹杂物与水口壁面摩擦的位移电流效应，重在评估摩擦状态、界面润湿特征与瞬态摩擦荷电之间的依赖关系。通过对不同流场和颗粒状态下水口结瘤行为的测试与分析，采用结合离散元的流体力学模拟、表面物相分析和频域信号测试等方法，在综合对比考察润湿角、流场、摩擦状态与诱导电场特征等参量对夹杂物黏附动力学影响的基础上，明确流场-电场耦合作用与水口结瘤之间内在的规律性。旨在阐明夹杂物迁移、吸附、烧结过程中的内在物理化学主控机制。项目可为钢中夹杂物瞬态摩擦荷电理论体系奠定基础，同时为水口材料设计及防堵塞控制提供新思路和新方法。

Based on the close relationship between the clogging of submerged entry nozzle and the adhesion-deposition of inclusions in molten steel, the correlation and mechanism among adhesion process of inclusions and transient triboelectrification as well as its inducing electric field will be studied in this proposal. According to introducing the motion friction characteristics of inclusions into the clogging layer growth of the submerged entry nozzle, the correlation and mechanism among the clogging of submerged entry nozzle and the transient triboelectrification, which induced by the relative movement among inclusions, inner surface of submerged entry nozzle and molten steel will be explored. The dependency relationship among friction state, interface wetting characteristics and transient triboelectrification will be evaluated emphatically on the basis of the displacement current effect of friction between inclusions and inner surface of nozzle. The clogging behavior of the submerged entry nozzle under different inclusions and flow field states will be measured and analyzed. The effects of parameters, such as contact angle, flow field, friction status and induced electric field, on the adhesion dynamics of inclusions will be investigated. Combining the methods of fluid dynamics simulation of discrete element, surface phase analysis and the frequency domain signal testing, the inherent regularity between the coupled effect of flow field and electric field on the clogging of submerged entry nozzle will be confirmed. The purpose is to clarify the main physico-chemical mechanism of the migration, adsorption and sintering of the inclusions into submerged entry nozzle. This project can established the foundation for the theoretical system of transient triboelectrification of inclusions in the molten steel, and provide new ideas and methods for the design and anti-clogging of submerged entry nozzle.