钢液内超声空化气泡运动过程模拟
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Simulation of Evolution Process of Ultrasonic-cavitation Bubble in Molten Steel
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    摘要:

    本文研究了的钢液内超声空化气泡的运动过程,即空化气泡壁不断膨胀、收缩乃至崩溃的过程。利用四阶龙格库塔法,并通过Matlab解出公式中关于t与R的数值解,来模拟以超声声压幅值、频率、空化气泡初始平衡半径及k值的变化对钢液内空化气泡运动过程的影响。计算结果说明钢液内的超声处理存在瞬稳态空化转化阀值。在低于和高于瞬稳态空化转化阀值的情况下,各种参数对空化气泡运动过程的影响均有不同的变化。稳态空化下,通过增大R0可在较小的超声波工作频率下,达到超声与空化气泡的共振,从而明显提高空化效果;瞬态空化下,大的Pa、低频、小的R0、大的k值(单原子气体)有利于提高空化效果。在实际的钢液内超声操作时,应根据不同情况调节各种参数配置,以控制空化效果。

    Abstract:

    In this paper, evolution process of ultrasonic-cavitation bubble in molten steel is about expending、contracting and collapsing of cavitation bubble wall. Through Matlab,t and corresponding R can be solved used by four order Runge-Kutta.Influence of Pa、f、R0 and k on evolution process of ultrasonic-cavitation bubble can be simulated. Results show: There is the threshold value of conversion between transient state cavitation and steady state cavitation with ultrasonic treatment in molten steel. When the value of sound intensity is below or above the threshold value, variations of various parameters can have some different effects on evolution process of ultrasonic-cavitation bubble. In brief, under steady state, through increasing R0, the resonance between ultrasonic and cavitation bubble can emerge used by low frequency, and effects of ultrasonic can be improved obviously. Under transient state, high Pa、low frequency、small R0 and high k(monatomic gas)can improve effects of ultralsonic. In practice of ultrasonic treatment, various parameters can be adjusted to control effects of ultrasonic according to different situation.

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孔为,苍大强,王文波. 钢液内超声空化气泡运动过程模拟[J]. 科学技术与工程, 2010, (35): .
kongwei, cangdaqiang, wangwenbo. Simulation of Evolution Process of Ultrasonic-cavitation Bubble in Molten Steel[J]. Science Technology and Engineering,2010,(35).

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历史
  • 收稿日期:2010-10-10
  • 最后修改日期:2010-10-10
  • 录用日期:2010-10-18
  • 在线发布日期: 2010-11-19
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