Mechanism of the Film-Impingement Cooling in DC Casting

摘要

The secondary cooling by impinging water jets in DC casting has been in the focus of many research efforts. Due to the difficulties to perform measurements directly in the cast-house, most of the experiments have been done in laboratories with preheated, steady targets. The interpretation of the experimental results generally follows the classic division of the process into film-boiling, nucleate-boiling and single-phase convective heat transfer. This paper presents the results of the analysis of the heat transfer mechanisms during the jet impingement cooling of ingots. Special emphasis has been put on the effects of the relative movement of the jet and ingot, on the interaction between the heat conduction in the solid and the heat transfer on the fluid side and on the clarification of the differences of the boiling regimes in pool and impingement boiling.