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首页> 外文期刊>Journal of Crystal Growth >Study on thermocapillary convection in Bi12SiO20 melt
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Study on thermocapillary convection in Bi12SiO20 melt

机译：Bi12SiO20熔体中热毛细管对流的研究

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We investigated experimentally convective flow phenomena of Bi12SiO20 melts with Prandtl number Pr = 26. Schilren technique coupling differential interferential microscope was employed to in-situ observation of the convective flow. The test section was a loop-shaped Pt wire heater. Optical evaluations in connection with thermocouple (Pt90wt%-Rh10wt%) measurements made it possible to get the new transition ideas of flow structure in the considered convective system. In this article we deal with the phenomenon ranging from steady spatial phenomena to oscillatory behavior. Convective flow occurs in the form of an axially symmetric pattern (ASP). In the steady convection stage, the flow configuration appears as a fish-tail shape which comprises of a main trunk and two branches. The width of the main trunk decreases with rise in temperature, and in the main trunk the amplitudes of the hydrothermal waves increases. The critical Marangoni number Ma(c) is 22433 for the transition to oscillatory convection. The oscillatory convection occurs in the form of a non-axisymmetric pattern, that separates the flow configuration into two sectors. At one end of ASP the hydrothermal wave originates and at the other end of the ASP it vanishes. The oscillatory frequency was obtained at 5-7 Hz. (C) 2004 Elsevier B.V. All rights reserved.
机译：我们研究了Bi12SiO20熔体的对流流动现象，其Prandtl数为Pr =26。采用Schilren技术与差分干涉显微镜耦合对流进行现场观察。测试部分是一个环形的铂丝加热器。与热电偶（Pt90wt％-Rh10wt％）测量相关的光学评估使得在对流系统中获得新的流动结​​构转换思路成为可能。在本文中，我们处理从稳定空间现象到振动行为的现象。对流以轴向对称模式（ASP）的形式发生。在稳定对流阶段，流动结构呈鱼尾状，由一个主干和两个分支组成。主干的宽度随着温度的升高而减小，并且在主干中，热液波的振幅增加。过渡到振荡对流的临界Marangoni数Ma（c）为22433。振荡对流以非轴对称模式的形式发生，该模式将流动配置分为两个扇区。在ASP的一端产生热液波，而在ASP的另一端则消失。振荡频率为5-7 Hz。 （C）2004 Elsevier B.V.保留所有权利。

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