2种浸入式侧吹模式下的熔池搅拌现象

在考虑流股成泡后各分散气泡形阻力的影响以及气液相运动时相间的滑移等条件的基础上,耦合了Sato模型和湍流分散力,建立了欧拉气液两相多流体模型;采用计算流体力学的方法对深侧吹和浅侧吹2种不同浸入式侧吹模式下熔池内两相流动状态和混合特性等进行了计算和比较.研究结果表明:浸入式侧吹能有效吸收气体流股的冲击能量,减少喷溅,熔池中易于形成有利于体系混合的环流;深侧吹比浅侧吹具有更强的搅拌能力和更快的混合速度,相间和相内传质速度更快,可以为高碳锰铁快速脱碳提供更加良好的反应动力学条件.

Gas Stirring Behaviors in Two Types of Side-blown Metallic Baths

Eulerian multiphase multi-fluid model was formulated to simulate the flow pattern and mixing property in submerged sideblown metallic bath. In the model, the bubble-induced turbulence was integrated with Sato model, and turbulent dispersion force and gas-liquid inter-phase slip were considered. Using computation fluid dynamic method, the mixing properties of two types of submerged side-blown metallic bath, shallow side-blown and deep side-blown were compared. All calculations were done in three dimensions. The results show that the impact energy of in-blowing gas can be effectively absorbed by metallic liquid , splash in bath can be alleviated, and circumfluence flow, which is in favor of systematic mixing, can form easily with gas side-blowing. Metallic bath with deep side-blowing can provide stronger stirring ability, faster mixing rate, faster inter-phase and inner-phase mass transfer rate than that with shallow side-blowing. Therefore, metallic bath with deep gas side-blowing can provide better environment for high-carbon manganese ferrous decarburization.