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The interaction of thermocapillary convection and low-frequency vibration in nearly-inviscid liquid bridges

机译:几乎无粘性的液桥中热毛细管对流与低频振动的相互作用

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摘要

The combined effect of thermocapillary stress and steady forcing due to vibrations of the disks in a model-half-zone axisymmetric liquid bridge is considered for low-viscosity liquids (i.e., with a large capillary Reynolds number), and low nondimensional vibration frequencies (i.e., small as compared to the capillary Reynolds number). An asymptotic model is derived for the slowly-varying streaming flow in the bulk (outside the oscillatory boundary layers) resulting from both effects that includes also buoyancy and other thermal expansion effects. This model is used to first analyze the steady streaming flow patterns in isothermal conditions and then to show that mechanical vibrations can annihilate almost completely thermocapillary flows of fairly large Reynolds numbers provided that: (i) the Prandtl number is appropriately small, (ii) both disks are vibrated, and (iii) the vibrating amplitudes, frequency and phases are appropriate (the counterbalancing effect depends crucially on the difference of the vibrating phases of both disks)
机译:对于低粘度液体(即,毛细管雷诺数大)和低维数振动频率(即,低粘度液体),考虑了热毛细管应力和圆盘在模型半区轴对称液桥中的振动引起的稳态强迫的共同作用。 ,与毛细管雷诺数相比较小。推导了由(包括浮力和其他热膨胀效应)的两种效应所导致的块体(振荡边界层之外)中缓慢变化的流的渐近模型。该模型用于首先分析等温条件下的稳定流态,然后证明机械振动可以消除几乎完全雷诺数较大的热毛细管流,条件是:(i)普朗特数适当小,(ii)两者均振动磁盘,并且(iii)振动幅度,频率和相位合适(平衡效果主要取决于两个磁盘的振动相位之差)

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