CONVECTIVE INSTABILITY MECHANISMS IN THERMOCAPILLARY LIQUID BRIDGES

被引：290

作者：

WANSCHURA, M

SHEVTSOVA, VM

KUHLMANN, HC

RATH, HJ

机构：

[1] ZARM-University of Bremen

来源：

PHYSICS OF FLUIDS | 1995年 / 7卷 / 05期

关键词：

D O I：

10.1063/1.868567

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The primary instability of axisymmetric steady thermocapillary flow in a cylindrical liquid bridge with non-deformable free surface is calculated by a mixed Chebychev-finite difference method. For unit aspect ratio the most dangerous mode has an azimuthal wavenumber m=2. The physical instability mechanisms are studied by analyzing the linear energy balance of the neutral mode. If the Prandtl number is small (Pr≪1), the bifurcation is stationary. The associated neutral mode is amplified in the shear layer close to the free surface. For large Prandtl number (Pr=4), the basic state becomes linearly unstable to a pair of hydrothermal waves propagating nearly azimuthally. Both mechanisms are compared with those previously proposed in the literature. © 1995 American Institute of Physics.

引用

页码：912 / 925

页数：14

共 38 条

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