Unsteady interfacial phenomena during inward weld pool flow with an active surface oxide

摘要: Particle image velocimetry (PIV) was applied to estimate the velocity field on a weld pool surface with an oxide layer. A positive tension gradient drives inward flow pattern from boundary centre of pool, resulting in particles collecting line at surface. Unsteady motions were observed by experimental visualisation particle flow, and computed shows strong unsteady interfacial movement during flow. These are related clockwise counterclockwise vortices surface, which turn affect both mass energy transport. Both qualitative motion quantitative described this work, contributes explaining characteristic fluid measurements also provide data for validation numerical models pool.