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首页> 外文期刊>International Journal of Heat and Mass Transfer >Oscillatory thermocapillary flow in liquid bridges of high Prandtl number fluid with free surface heat gain
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Oscillatory thermocapillary flow in liquid bridges of high Prandtl number fluid with free surface heat gain

机译：具有自由表面热增益的高普朗特数流体的液桥中的振荡热毛细管流

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摘要

Oscillatory thermocapillary flow in liquid bridges of high Prandtl number fluid is studied. The effect of free surface heat transfer, especially heat gain, on the oscillation phenomenon is investigated experimentally and numerically. It is shown that the critical temperature difference (ΔT_(cr)) changes substantially when the free surface heat transfer changes from loss to gain in the case of nearly straight liquid bridges. In contrast, ΔT_(cr) is not affected by the free surface heat transfer with concave liquid bridges. The free surface heat transfer rate is computed numerically by simulating the interaction of the liquid and the surrounding air. The oscillatory flow is also investigated numerically by analyzing the liquid flow in three-dimensions for straight bridges. The computed results agree well with the experimental data. The simulation shows that the free surface heat gain enhances the surface flow and that the oscillatory flow is a result of interactions between the convection effect and buoyancy. The flow does not become oscillatory if there is no net heat gain at the free surface in the range of Marangoni number of the present work (≤1.8 x 10~4), so the present cause of oscillations is different from that in the free surface heat loss case we investigated in the past.
机译：研究了高普朗特数流体的液桥中的振荡热毛细管流。实验和数值研究了自由表面热传递，特别是热增益，对振荡现象的影响。结果表明，在接近直的液桥的情况下，当自由表面传热从损失变为增加时，临界温度差（ΔT_（cr））发生了显着变化。相反，ΔT_（cr）不受具有凹形液桥的自由表面传热的影响。通过模拟液体与周围空气的相互作用，以数值方式计算自由表面的传热速率。还通过分析直桥的三维空间中的液体流动来对振动流动进行数值研究。计算结果与实验数据吻合良好。模拟表明，自由表面热增益增强了表面流，而振荡流是对流效应和浮力之间相互作用的结果。如果在当前功的马朗尼数（≤1.8x 10〜4）的范围内自由表面没有净热增益，则流体不会振荡，因此当前的振荡原因与自由表面的不同。我们过去调查过的热损失案例。

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