水平磁场作用下液态金属自由射流破碎特性的实验研究

doi:10.7523/j.ucas.2022.029

摘要/Abstract

摘要： 基于高速摄影系统，开展无磁场及水平磁场下液态金属三维自由射流实验，实现对无氧环境中最大We数为400、最大Ha数为30的液态镓铟锡（GaInSn）射流破碎形成液滴过程的观察。从射流形态、表面扰动和破碎长度3个方面分析射流破碎特性。无磁场时，射流呈现9种不同形态，表面扰动呈现膨胀波和正弦波两种形式，且随着We数的增大，扰动振幅先减小后增大，破碎长度先增大后减小。当施加水平磁场时，射流呈现4种典型形态，射流前缘在垂直磁场线方向呈扁平状，沿磁场线方向呈椭圆状，且随着Ha数的增大，射流破碎长度整体呈现增长趋势，但在部分工况下会出现减小的现象。

关键词: 液态金属, 自由射流, 破碎特性, 磁场环境

Abstract: Based on a high-speed photographic system, experiments on three-dimensional free jets of liquid metal in the absence of a magnetic field and in a horizontal magnetic field have been carried out to observe the process of liquid GaInSn jet breakup and droplet formation in an oxygen-free environment with a maximum We of 400 and a maximum Ha of 30. From the results on jet morphology, surface disturbance, and breakup length, we analyzed the characteristics of jet breakup. In the absence of magnetic field, the jet shows nine different morphologies, and the surface disturbance shows two forms:expansion wave and sinusoidal wave; with the increase of We, the disturbance amplitude first decreases and then increases, and the breakup length first increases and then decreases. When a horizontal magnetic field is imposed, the jet shows four typical morphologies, with the leading edge of the jet being flattened in the direction of the vertical magnetic field line and elliptical along the magnetic field line. As the Ha number increases, the jet break length tends to increase overall, but decreases in some operating conditions. The results of this paper have enriched the phenomenon of liquid metal jets under magnetohydrodynamic effects.

Key words: liquid metal, free jet, breakup characteristics, magnetic field environment

中图分类号:

O361.3

董泉润, 阳倦成, 倪明玖. 水平磁场作用下液态金属自由射流破碎特性的实验研究[J]. 中国科学院大学学报, 2022, 39(5): 577-585.

DONG Quanrun, YANG Juancheng, NI Mingjiu. An experimental investigation on the breakup characteristics of liquid metal free jet under a horizontal magnetic field[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(5): 577-585.

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