【摘要】 铸坯中与气泡有关的缺陷对于钢的质量有很大的危害,有效去除钢中气泡成为高质量钢的主要任务。文章以吹氩的板坯结晶器为研究内容,运用理论计算对凝固前沿的气泡的受力进行量化。主要结论如下:气泡在钢液中主要受到重力、浮力、虚假质量力、升力、曳力、温度马兰戈尼力、浓度马兰戈尼力的影响。气泡被捕获的时候分为三个阶段,首先是气泡从结晶器主体钢液靠近温度边界层,在这个过程中气泡的运动主要受到曳力、浮力的作用;其次气泡进入温度边界层,在这个阶段气泡主要受到曳力、浮力、以及由温度梯度引起的马兰戈尼力;第三个阶段,气泡穿过温度边界层,到达浓度边界层,受到浓度的马兰戈尼力,其中浓度马兰戈尼力的方向总是朝着凝固前沿的方向。更多还原

【Abstract】 Bubble-related defects in the slab have a significant impact on the quality of the steel. Therefore, the effective removal of bubbles in steel becomes the main task of high quality steel. So, it is of great significance to study the discrete phase motion behavior with argon blowing in a slab continuous casting mold. The theoretical calculation was used to quantify the force of bubbles in the front of solidification.The main contents and conclusions of this paper are as follows: The bubbles in the molten steel are mainly subjected to gravity, buoyancy, virtual mass force, lift force, drag force, temperature Marangoni force, and concentration Marangoni force. The entrapment of a bubble follows 3 steps, Firstly, the bubble approaching the thermal boundary layer. During this step, movement of the bubble is mainly affected by the buoyancy and drag forces. Secondly, bubbles enter the temperature boundary layer, at this stage the bubbles are mainly dragged, buoyant and temperature Marangoni. Thirdly, Bubbles pass through the temperature boundary layer, reach the concentration boundary layer, and are exposed to a concentration of Marangoni force, in which the concentration of Marangoni forces is always in the direction of the solidification front.更多还原