液滴碰撞不同接触角线缆表面的模拟

Simulation of Droplet Impact on Cable Surfaces with Different Contact Angles

针对常见的液滴输电线缆搭建对应的计算模型,通过Fluent内置的VOF对不同疏水性表面进行计算,讨论液滴与线缆的接触时间、铺展半径与接触角度之间的关系,并分析不同接触角下液滴的压力云图和速度矢量图。模拟计算结果显示:液滴与壁面接触的运动状态受壁面接触角的影响,液滴铺展面积和接触时间与壁面接触角呈反比关系;提高壁面接触角会降低铺展面积、减少接触时间,加快液滴的回缩、回弹,运动液滴最终滑落离开壁面;小接触角壁面铺展面积增大、接触时间增加,液滴最终完全铺展停留于壁面上。研究结果对探究不同疏水性下液滴在线缆壁面结冰的原理及特性具有一定的指导和参考意义。

Icing of transmission lines will have a negative impact on the safety of line operation and human production and life.The research on anti-icing has gradually developed from the early active anti-icing to the present passive anti-icing,but the passive antiicing research mostly stays on the improvement of hydrophobicity without in-depth exploration of its anti-icing principle.For common droplet transmission cables,the corresponding calculation model is built.The relationship between the contact time,spreading radius and contact angle between droplet and cable is discussed by using the built-in VOF of Fluent to calculate different hydrophobic surfaces,and the pressure nephogram and velocity vector diagram of droplet under different contact angles are analyzed.The simulation results show that the motion state of the droplet contact with the wall is affected by the wall contact angle,and the spread area and contact time of the droplet are inversely proportional to the wall contact angle.Increasing the wall contact angle will reduce the spread area,reduce the contact time,accelerate the droplet retraction and rebound,and the moving droplet will eventually slide off the wall.The spread area of the wall surface with small contact angle increases and the contact time increases.The droplet finally spreads completely and stays on the wall surface.These results have certain guidance and reference significance for exploring the principle and characteristics of droplet icing on cable wall under different hydrophobicity.