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首页> 外文期刊>ISIJ international >Bubble Behavior and Size Distributions in Stopper-Rod Nozzle and Mold during Continuous Casting of Steel Slabs
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Bubble Behavior and Size Distributions in Stopper-Rod Nozzle and Mold during Continuous Casting of Steel Slabs

机译：钢坯连铸过程中塞杆喷嘴和铸型中的气泡行为和尺寸分布

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摘要

Argon-gas injection parameters including flow rate and bubble size distribution are important to prevent nozzle clogging, control the mold flow, and reduce bubble-related defects in steel continuous casting. This work employs water-air model experiments and analytical modeling to quantify the behavior and size distributions of gas bubbles in the nozzle and mold during nominally steady-state slab-casting, focusing on gas injection through a stopper-rod with multiple side-channels. Bubble formation, breakup, coalescence, and accumulation are investigated with experiments using a one-third scale water model with the aid of high-speed video recording and analytical models to predict gas pressure, initial bubble size, bubble descending velocity, bubble residence time, and bubble size distribution considering accumulation. In addition, size distributions of the bubbles in the nozzle and mold are quantified by analyzing snapshots of bubble images. Bubbles initiate at the gas channel exit in the stopper-rod after overcoming the pressure threshold, and then expand and elongate until detaching from the stopper-rod surface. After that, turbulent flow breaks up the bubbles inside the gap between the stopper-rod and the nozzle inlet. The bubbles sometimes coalesce with others, and get bigger while flowing down through the nozzle. The bigger bubbles have longer residence time, and accumulate in the nozzle, due to higher buoyancy on them. With higher gas flow-rate, bubble size distribution in the nozzle and mold shows larger average-size and broader size-range. Finally, the validated initial bubble-size model with the water-air model measurements is extrapolated to estimate argon-bubble sizes in molten steel with real caster conditions.
机译：氩气注入参数（包括流量和气泡尺寸分布）对于防止喷嘴堵塞，控制结晶器流动并减少钢连铸中与气泡相关的缺陷非常重要。这项工作采用水-空气模型实验和分析模型来量化名义稳态铸坯过程中喷嘴和模具中气泡的行为和尺寸分布，重点是通过带有多个侧通道的塞杆进行气体注入。借助高速视频记录和分析模型，使用三分之一比例的水模型，通过实验研究了气泡的形成，破裂，聚结和积累，以预测气体压力，初始气泡大小，气泡下降速度，气泡停留时间，和气泡尺寸分布考虑了累积。另外，通过分析气泡图像的快照来量化喷嘴和模具中气泡的尺寸分布。超过压力阈值后，气泡会在塞杆上的气体通道出口处引发，然后膨胀并伸长直到从塞杆表面脱离。之后，湍流使塞杆和喷嘴入口之间的间隙内的气泡破裂。气泡有时会与其他气泡合并，并在通过喷嘴向下流动时变得更大。较大的气泡具有更长的停留时间，并且由于其上的较高浮力而在喷嘴中累积。随着气体流速的提高，喷嘴和模具中的气泡尺寸分布显示出更大的平均尺寸和更宽的尺寸范围。最后，外推经过验证的初始气泡尺寸模型和水-空气模型的测量值，以估计在实际连铸机条件下钢水中的氩气泡尺寸。

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  • 来源
    《ISIJ international》 |2018年第8期|1443-1452|共10页
  • 作者

    Seong-Mook CHO; Brian G. THOMAS; Seon-Hyo KIM;

  • 作者单位

    Department of Mechanical Engineering, Colorado School of Mines, 1610 Illinois Street, Golden, Colorado, 80401 USA;

    Department of Mechanical Engineering, Colorado School of Mines, 1610 Illinois Street, Golden, Colorado, 80401 USA,Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois, 61801 USA;

    Department of Materials Science & Engineering, Pohang University of Science & Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 790-784 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    multiphase flow; argon; bubble; breakup; coalescence; accumulation; size distribution; water model;

    机译：多相流氩气气泡;分手;合并;积累;尺寸分布;水模型;

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