Thermocapillary convection in a differentially heated two-layer annular system with and without rotation
Thermocapillary convection in a differentially heated two-layer annular system with and without rotation
复制标题
带旋转和不带旋转的差热两层环形系统中的热毛细管对流
DOI：
10.1016/j.ijheatmasstransfer.2016.10.038
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发表时间：
2017-02
影响因子：
5.2
通讯作者：
Shi Wan-Yuan
中科院分区：
文献类型：
--
作者：
Li Han-Ming;Shi Wan-Yuan
通过一系列的三维数值模拟研究了5cS硅油和HT-70组成的差热双层环形池中的热毛细对流。考虑了有旋转和没有旋转的两种系统。结果表明，当马兰戈尼数较小时，热毛细对流是稳定的轴对称对流。系统旋转抑制了低层的径向流动。一旦马兰戈尼数超过阈值，在两层中同时发生三维振荡流动。稳定性图表明，弱旋转使轴对称流动失稳，而强旋转使振荡流动的发生延迟。振荡流的波型表现为向外传播的叶状波。表面振荡和界面振荡总是有一个共同的频率，但有大约半个周期的相位滞后。在旋转池中，单组弯曲热液波沿与池旋转方向相反的方位方向传播。随着旋转速率的增加，波数增加，振荡频率减小。
Thermocapillary convection in a differentially heated bilayer annular pool consisting of 5cS silicone oil and HT-70 is investigated by a series of three-dimensional numerical simulations. Both systems with and without rotation are considered. The results indicate that the thermocapillary convection is steady and axisymmetric when the Marangoni number is small. The system rotation suppresses the radial flow in the lower layer. Once the Marangoni number exceeds a threshold value, three-dimensional oscillatory flow occurs in both layers simultaneously. The stability diagram reveals that weak rotation destabilizes the axisymmetric flow, while stronger rotation retards the onset of oscillatory flow. The wave patterns for oscillatory flow appear in the form of blade-like waves propagating outward. The surface oscillation and the interface oscillation always share a common frequency but have about a half-period phase lag. In the rotating pool, single group of curved hydrothermal waves propagates in the azimuthal direction opposite to the pool rotation. As the rotation rate increases, the wave number increases while the oscillation frequency decreases.
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影响因子：
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通讯作者：
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作者：
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