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arXiv 1004.3467physics.flu-dyn
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横向AC磁场中金属液滴边缘箍缩的不稳定性

Edge pinch instability of oblate liquid metal drops in a transverse AC magnetic field

Jānis Priede

摘要:

本文研究了高频交流磁场作用下液态金属液滴的稳定性。根据标量磁位的表面积分导出了能量变分原理。这一原理被应用到一个薄的理想导电液体盘,这是用来模拟两个平行的绝缘板之间的水平间隙约束的液滴。首先分析了圆盘在小振幅谐和边缘扰动下的稳定性。解析解表明,当方位波数m= 2,3,4...当磁键数超过临界阈值Bm_c= 3 pi(m+1)/2时开始发展。最不稳定的是m=2模式,对应于椭圆变形。其次,强烈变形的平衡形状的数值模拟相结合的解决方案的标量磁位的表面积分方程的非结构化三角形网格上的相关能量最小化。边缘的不稳定性被发现导致的平衡形状的两个或三重旋转对称性取决于磁场强度和初始扰动。更高旋转对称性的形状是不稳定的,并回落到这两个基本状态之一。所开发的方法是有效的和足够准确的建模强烈变形的液滴形状。

英文摘要:

This paper considers the stability of liquid metal drops subject to a high-frequency AC magnetic field. An energy variation principle is derived in terms of the surface integral of the scalar magnetic potential. This principle is applied to a thin perfectly conducting liquid disk, which is used to model the drops constrained in a horizontal gap between two parallel insulating plates. Firstly, the stability of a circular disk is analysed with respect to small-amplitude harmonic edge perturbations. Analytical solution shows that the edge deformations with the azimuthal wavenumbers m=2,3,4... start to develop as the magnetic Bond number exceeds the critical threshold Bm_c=3pi(m+1)/2. The most unstable is m=2 mode, which corresponds to an elliptical deformation. Secondly, strongly deformed equilibrium shapes are modelled numerically by minimising the associated energy in combination with the solution of a surface integral equation for the scalar magnetic potential on an unstructured triangular mesh. The edge instability is found to result in the equilibrium shapes of either two- or threefold rotational symmetry depending on the magnetic field strength and the initial perturbation. The shapes of higher rotational symmetries are unstable and fall back to one of these two basic states. The developed method is both efficient and accurate enough for modelling of strongly deformed drop shapes.

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