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首页> 外文期刊>ISIJ international >Motion of Single Bubble and Interactions between Two Bubbles in Liquid Steel
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Motion of Single Bubble and Interactions between Two Bubbles in Liquid Steel

机译：液态钢中单个气泡的运动和两个气泡之间的相互作用

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The bubbling in liquid steel can improve steel cleanliness effectively. To understand the single bubble behavior and the interactions between two bubbles, which are basis to analyze the mechanism of gas-liquid two-phase flow in metallurgical vessel, the bubbling at a laminar flow has been systematically studied by both water-model experiment and three-dimensional numerical simulation. Nozzle diameters of 1.5, 2, and 2.5 mm were investigated within a certain range of gas flow rate. The images of bubbles emerging from the nozzle were observed by the water-model experiment. The volume of fluid (VOF) model in conjunction with continuum surface force (CSF) model was used to describe the interface between the gas and liquid on the software platform of Fluent 14.5. The phenomena of bubbling, rising motion, coaxial bubbles coalescence and parallel bubbles bounce with one- and two-nozzle were found in air-water and argon-steel system. The initial bubble sizes increase with increasing gas flow rate or nozzle size, whereas is relatively independent of the nozzle size when gas flow rate is 0.975 L/min. The terminal velocities of all bubbles are around 0.32 m/s. The evolution history of bubble shape changes from non-deformed (spherical) to the deformed shapes (spherical cap, ellipsoidal, wobbly or ellipsoidal cap) without coalescence. Calculated velocity and pressure distributions indicated that the rising velocity of the trailing bubble is larger than that of the leading bubble, which result in two coaxial bubbles coalescence. The small eddies on the inner edge of two parallel bubbles eventually lead to bubbles bounced each other.
机译：液态钢中的气泡可有效提高钢的清洁度。为了了解单个气泡的行为以及两个气泡之间的相互作用，这是分析冶金容器中气液两相流动机理的基础，通过水模型实验和三个实验系统地研究了层流中的气泡。维数值模拟。在一定的气体流速范围内研究了喷嘴直径1.5、2和2.5 mm。通过水模型实验观察从喷嘴冒出的气泡的图像。在Fluent 14.5的软件平台上，使用流体体积（VOF）模型和连续表面力（CSF）模型来描述气体和液体之间的界面。在空气-水和氩-钢系统中发现了起泡，上升运动，同轴气泡聚结和带有一个和两个喷嘴的平行气泡反弹的现象。初始气泡尺寸随气体流速或喷嘴尺寸的增加而增加，而当气体流速为0.975 L / min时，气泡的尺寸相对独立于喷嘴尺寸。所有气泡的最终速度约为0.32 m / s。气泡形状的演变历史从未变形的（球形）到变形的形状（球形帽，椭圆形，摆动或椭圆形帽）没有聚结。计算得出的速度和压力分布表明，后气泡的上升速度大于前气泡的上升速度，这导致两个同轴气泡合并。在两个平行气泡的内边缘上的小涡流最终导致气泡相互反弹。

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