Response of Gas Bubbles in Spherical Clusters to a Single Underpressure Pulse

IF 1 4区 物理与天体物理 Q4 PHYSICS, APPLIED
A. A. Aganin, I. A. Aganin, A. I. Davletshin, R. I. Nigmatulin
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引用次数: 0

Abstract

The paper studies the response of gas (air) bubbles in a spherical cluster to a single pulsed cosine-shaped decrease and subsequent recovery of the pressure of the surrounding liquid (water–glycerin mixture) with a pulse duration in the vicinity of the period of natural oscillations of the cluster. It is assumed that, during the response, all bubbles remain weakly nonspherical. The effect of the duration and amplitude of the excitation pulse, the position of bubbles in the cluster, the distance between bubbles, and the number of bubbles in the cluster is studied. Cubic clusters in which the centers of the bubbles are located at the nodes of a cubic grid, as well as clusters with a random arrangement of bubbles and with bubbles located at the center and vertices of a number of regular polyhedra nested in each other are considered. To estimate the effect of the interaction between bubbles, comparison with the response of a single bubble is made. One of the variants of discrete models of the dynamics of bubbles in a cluster is used, in which, along with radial oscillations, their spatial displacements and small nonspherical deformations are simulated. It has been established that, if the nonspherical deformations of the bubbles during the response are small, the maximum increase in pressure in the bubbles relative to its initial value is at most several-fold. If this assumption is ignored, significantly higher degrees of bubble compression can be obtained. The reason is that, when the condition of smallness of deformations is violated, the ranges of the parameters under consideration expand significantly.

Abstract Image

球形气团中的气泡对单次欠压脉冲的响应
摘要 本文研究了球形气泡团中的气体(空气)对周围液体(水-甘油混合物)压力的单脉冲余弦形下降和随后恢复的响应,脉冲持续时间与气泡团的自然振荡周期相近。假设在响应期间,所有气泡都保持弱非球形。研究了激励脉冲的持续时间和振幅、气泡在簇中的位置、气泡之间的距离以及簇中气泡数量的影响。研究考虑了气泡中心位于立方体网格节点的立方体气泡簇,以及气泡随机排列的气泡簇和气泡位于相互嵌套的多个正多面体的中心和顶点的气泡簇。为了估算气泡之间相互作用的影响,将与单个气泡的响应进行比较。使用了气泡群动力学离散模型的一种变体,其中除了径向振荡外,还模拟了气泡的空间位移和小的非球形变形。实验证明,如果气泡在响应过程中的非球形变形很小,则气泡中的压力相对于初始值的最大增幅最多为几倍。如果忽略这一假设,气泡的压缩程度会大大提高。原因在于,当违反变形小的条件时,所考虑的参数范围会显著扩大。
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来源期刊
High Temperature
High Temperature 物理-物理:应用
CiteScore
1.50
自引率
40.00%
发文量
0
审稿时长
4-8 weeks
期刊介绍: High Temperature is an international peer reviewed journal that publishes original papers and reviews written by theoretical and experimental researchers. The journal deals with properties and processes in low-temperature plasma; thermophysical properties of substances including pure materials, mixtures and alloys; the properties in the vicinity of the critical point, equations of state; phase equilibrium; heat and mass transfer phenomena, in particular, by forced and free convections; processes of boiling and condensation, radiation, and complex heat transfer; experimental methods and apparatuses; high-temperature facilities for power engineering applications, etc. The journal reflects the current trends in thermophysical research. It presents the results of present-day experimental and theoretical studies in the processes of complex heat transfer, thermal, gas dynamic processes, and processes of heat and mass transfer, as well as the latest advances in the theoretical description of the properties of high-temperature media.
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